GEOLOGIC MAP OF WASHINGTON - SOUTHEAS.T QUADRANT L1BRAt1Y DEPT. OF NATURAL RESOURCES GEOLOGY & EARTH RESOURCES DtVIGION OLYMPIA, WA. 98504-7007 by J. ERIC SCHUSTER, CHARLES W. GULICK, STEPHEN P. REIDEL, KARL R. FECHT, AND STEPHANIE ZURENKO

WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES GEOLOGIC MAP GM-45 1997

Division of Geology and Eat1h Resourw y l Ray t.asmanls, State Geologlst WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES Raymond Lasmanis, State Geologist

GEOLOGIC MAP OF WASHINGTON - SOUTHEAST QUADRANT

by

J. ERIC SCHUSTER, CHARLES W. GULICK, STEPHEN P. REIDEL, KARL R. FECHT, and STEPHANIE ZURENKO

WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES GEOLOGIC MAP GM-45

1997 Photograph on envelope: Oblique aerial view of the Palouse Falls area on the lower Palouse River in Whitman and l=ranklin Counties. View is toward the southeast, and, at river distance, the view is about one mile wide. Palouse Falls (185 ft high) is in the lower center of the photograph, the dark linear feature in the foreground is a railroad cut, and the grove of trees is the parking area for Palouse Falls State Park. Several Columbia River basalt flows covered this area about 15 million years ago. In the Palouse River canyon the lowest flows are two flows of the Sentinel Bluffs unit in the upper part of the Grande Ronde Basalt; the lip of the falls is in the Palouse Falls flow, and the flow under the parking lot is the Ginkgo flow, both part of the Frenchman Springs Member of the Wanapum Basalt. Upland areas farther from the river expose the Roza and Priest Rapids Members of the Wanapum (Carson and Pogue, 1996, p. 19). After basalt eruptions ceased streams began to establish valleys on the basalt surface, and windblown loess began to accumulate, in some places to depths of more than 200 feet. The paleo-Palouse River flowed westward down what is now Washtucna Coulee. Several times between about 19,000 and 11,000 years ago glacial outburst flood waters from glacial Lake Missoula flowed down the Cheney-Palouse scabland tract, entered the area of the photograph by way of Washtucna Coulee, and overtopped the drainage divide between the paleo-Palouse River and the Snake River. The floods stripped away the covering of loess, selectively eroded fractured areas of the basalt to form canyons, and changed the course of the Palouse River so that the post-flood river joins the Snake River to the south instead of continuing down Washtucna Coulee. At the latitude of Palouse Falls the area stripped by the floods is more than seven miles wide. The fracture systems that control this part of the course of the Palouse River trend N. 50° E., N. 20° W., and N. 55° W. (Carson and Pogue, 1996, p. 19). The short canyons trending away from the viewer are developed along the N. 55° W. fracture system, and the stretch of canyon just above the falls is on a N. 20° W. fracture. Since the end of the glacial floods talus slopes have softened the profiles of the cliffs, winds have deposited a thin veneer of loess, and soil-forming processes have allowed grasses and sagebrush to take root, but the landscape, in essence, dates from the ice age. Photograph courtesy of R. E. Peterson, Richland, WA.

This report is for sale by:

Publications Washington Department of Natural Resources Division of Geology and Earth Resources PO Box 47007 Olympia, WA 98504-7007

Folded map set: Price $ 7.36

Tax ~ (Washington residents only) Total $ 8.00

Flat map set: Price $ 9.20 Tax _Jill_ (Washington residents only) Total $ 10.00 (Flat map sets are mailed in tubes)

Mail orders must be prepaid. Please add $1.00 to each order for postage and handling. Make checks payable to Department of Natural Resources.

Printed in the United States of America. Printed on recycled stock. CONTENTS

Page Introduction . . . 1 Map compilation 1 Acknowledgments 2 Map design 2 Descriptions of map units . 3 List of named units . 3 Sources of map data 3 Correlation diagram . 3 Distribution of map units and sources of unit description information 10 Edge matches with other state geologic quadrant maps ...... 10 Bedrock geologic and tectonic map of the southeast quadrant .... 13 Additional information about members of the Columbia River Basalt Group 13 References cited ...... 15

ILLUSTRATIONS

Figure 1. Index to sources of map data, scales 1:5,300 through 1:24,000 4 Figure 2. Index to sources of map data, scales 1 :24,370 through 1 :62,500 5 Figure 3. Index to sources of map data, scale 1: 100,000 ...... 6 Figure 4. Index to sources of map data, scales 1: 125,000 through 1 :250,000 7 Figure 5. Generalized nomenclature and stratigraphic relations of Columbia River Basalt Group units ...... 8

TABLES

Table 1. Compiler, 1: 100,000-scale quadrangle, and OGER open-file report number for geologic maps in the southeast quadrant of Washington . 1 Table 2. Distribution of map units and sources of unit description information 11

PLATES

Sheet 1. Geologic map, key to geologic units, descriptions of map units Sheet 2. Correlation diagram, list of named units, bedrock geologic and tectonic map

iii GEOLOGIC MAP OF WASHINGTON - SOUTHEAST QUADRANT

by

2 3 J. Eric Schuster1, Charles W. Gulick , Stephen P. Reidel , Karl R. Fecht4, and Stephanie Zurenko5

1 Washington State Department of Natural Resources, Division of Geology and Earth Resources 2 Washington State Department of Natural Resources, Northeast Region 3 Pacific Northwest National Laboratory 4 Bechtel Hanford Co. 5 Washington State Department of Natural Resources, Central Region; formerly Stephanie Z. Waggoner.

INTRODUCTION 1). No report was prepared for the Wenatchee quadrangle because a geologic map of that quadrangle has been published The Geologic Map of Washington-Southeast Quadrant is by the U.S. Geological Survey (Tabor and others, 1982). the third in a series of four 1:250,000-scale geologic maps Authors Reidel and Fecht, assisted by M. A. Chamness, that together will make up the third geologic map of Washington published by the Washington Division of Geology performed new field mapping in the Richland and Priest Rapids 1: 100,000 quadrangles, and author Zurenko mapped and Earth Resources and its predecessors. (The first is Stose, a small area near the head of Rock Lake in the Rosalia 1936, accompanied by Culver, 1936, and the second is Hunt­ ting and others, 1961.) The Geologic Map of Washington­ 1: 100,000 quadrangle. New mapping was also acquired through a OGER geologic mapping support program, which Southwest Quadrant, the first map in the series, is available as funded two mapping projects in the southeast quadrant of Washington Division of Geology and Earth Resources Geologic Map GM-34 (Walsh and others, 1987). The second, Washington. (See Acknowledgments.) Geologic Map of Washington-Northeast Quadrant, is avail­ able as GM-39 (Stoffel and others, 1991). The last map of the series, Geologic Map of Washington-Northwest Quadrant, is Table 1. Compiler, 1: 100,000-scale quadrangle, currently in preparation (April, 1997). and OGER open-file report number for geologic maps in the southeast quadrant of Washington In addition to the 1:250,000-scale geologic map, this report includes a key to geologic units, descriptions of map units, a list of named units, a correlation diagram, Open File Compiler Quadrangle Report Number information on the ages of geologic units, a table showing the distribution of map units and sources of unit description information, a 1 :625,000-scale bedrock Gulick, C. W. Connell 94-14 geologic and tectonic map, source-of-data maps, and a Gulick, C. W. Moses Lake 90-1 list of references cited. A topographic base map, Gulick, C. W. Pullman 94-6 Washington Division of Geology and Earth Resources Gulick, C. W. Ritzville 90-2 Topographic Map TM-3, is available separately. Reidel, S. P., Priest Rapids 94-13 Fecht, K. R. Reidel, S. P., Richland 94-8 MAP COMPILATION Fecht, K. R. The Moses Lake, Ritzville, and Rosalia 1: 100,000-scale Schuster, J. E. Clarkston 93-4 quadrangle geologic maps (Gulick, 1990a, 1990b; Waggoner, Schuster, J. E. Goldendale 94-9 1990) were compiled as part of the effort to generate the Schuster, J. E. Hermiston 94-9 1:250,000-scale geologic map of the northeast quadrant of Schuster, J. E. Orofino 93-4 Washington (Stoffel and others, 1991). Preliminary compila­ Schuster, J. E. Toppenish 94-10 tion of the Geologic Map of Washington-Southeast Quadrant Schuster, J. E. Walla Walla 94-3 began in 1990 and 1991 when all available published and Wenatchee None unpublished geologic information was compiled for the (Tabor and others, 1982) remaining 1:100,000-scale quadrangles in southeastern Schuster, J. E. Yakima 94-12 Washington. These quadrangle maps and supporting texts Waggoner, S. Z. Rosalia 90-7 were finished in 1993 and 1994 and released as Division of Geology and Earth Resources (OGER) open-file reports (Table 2 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

The 1:100,000-scale geologic maps and supporting data John Kauffman, University of Idaho, Idaho Water Resources were then synthesized to prepare the l: 250, 000-scale Research Institute geologic map and other components of this publication. Eugene P. Kiver, Eastern Washington University William M. Phillips, formerly OGER John (Jack) E. Powell, Washington State Department of Natural Resources (formerly Central Washington University) ACKNOWLEDGMENTS Stephen P. Reidel, Pacific Northwest National Laboratory Donald A. Swanson, U.S. Geological Survey A publication such as this would not be possible were it Gary D. Webster, Washington State University not for the efforts of many geologists over a period of many years. The contributions of those who have produced maps Review of 1:250,000-scale Geologic Map and and reports we used as sources of information are acknow­ Report ledged by citation. (See References Cited.) Others have con­ tributed in other ways to the success of the state geologic map Donald A. Swanson, U.S. Geological Survey project and the publication of this report. We gratefully Ann Tallman, Kaiser Engineers Hanford Co. Terry L. Tolan, Consulting Geologist, Kennewick, WA acknowledge the contributions of those who are named below. Gary D. Webster, Washington State University Cartographic and Editorial Support (OGER staff) Nancy A. Eberle Katherine M. Reed MAP DESIGN Carl F. T. Harris Jari M. Roloff Anne Heinitz Paul Weyant Base Map Keith G. Ikerd No appropriate topographic base map of Washington Library Support (OGER staff) existed when this state geologic map project was initiated. Therefore, OGER chose to construct new 1:250,000-scale Rebecca A. Christie Connie J. Manson base maps by simplifying U.S. Geological Survey (USGS) 1: 100,000-scale, metric-contour topographic maps of Geologic Field Mapping Washington. The 1:250,000-scale base maps were manually (OGER Geologic Mapping Support Program) scribed from scale-stable reductions of l: 100,000-scale map separates. The control framework was a computer-generated Beth A. Gillespie, Washington State University Peter R. Hooper, Washington State University latitude-longitude grid in a Universal Transverse Mercator Stephen P. Reidel, Pacific Northwest National Laboratory Projection plotted by the USGS. The 1 :250,000-scale base map for the southeast quadrant of Washington is available as Unpublished Geologic Mapping a separate publication (Washington Division of Geology and Earth Resources Topographic Map TM-3). Robert D. Bentley, Central Washington University Newell P. Campbell, Yakima Valley College Geologic Map Karl R. Fecht, Bechtel Hanford Co. Mike A. Hagood, Portland State University and The Geologic Map of Washington-Southeast Quadrant Westinghouse Hanford Co. displays geologic units chiefly by age and lithology, not by Peter R. Hooper, Washington State University geologic formations. Formations are shown only for Miocene John (Jack) E. Powell, Washington State Department of volcanic rocks; without this subdivision much of the map Natural Resources (formerly Central Washington University) would be too simplistic to be of much benefit to the map user. Stephen P. Reidel, Pacific Northwest National Laboratory A multiple-level scheme of colors, patterns, and map Donald A. Swanson, U.S. Geological Survey Terry L. Tolan, Consulting Geologist, Kennewick, WA symbols has been used to portray age and lithology of geologic Stephanie Zurenko, Washington State Department of units on the 1:250,000-scale geologic map. (See Key to Natural Resources Geologic Units on Sheet 1.) The first level of detail, ex­ Gary D. Webster, Washington State University pressed by broad color ranges, distinguishes six general lithologic subdivisions: unconsolidated sedimentary deposits, Whole-rock Geochemical Analyses sedimentary rocks and deposits, volcanic rocks, intrusive rocks, metasedimentary and metavolcanic rocks, and Peter R. Hooper, Washington State University metamorphic rocks. The second level of detail, expressed by variations of color within each broad color range, indicates Field Trip Leaders age. The third level of detail, represented by patterns, distin­ Beth A. Gillespie, Washington State University guishes lithologic units or small groups of lithologic units. The Peter R. Hooper, Washington State University fourth level of detail, represented by the map symbols, iden­ Stephen P. Reidel, Pacific Northwest National Laboratory tifies individual geologic map units. Patrick K. Spencer, Whitman College Standard USGS age symbols are used for some map units, but because of the prevalence of Tertiary rocks in Review of 1: 100,000-scale Open-File Reports Washington, each Tertiary epoch has been assigned a Robert D. Bentley, Central Washington University separate age symbol. The Tertiary symbols were chosen with Vic E. Camp, San Diego State University the help of the editorial staff of the USGS (Denver), but the Newell P. Campbell, Yakima Valley College USGS has not formally adopted these symbols. Lithologic Peter R. Hooper, Washington State University symbols used here were devised specifically for the OGER state geologic map project and are not standard USGS sym- DESCRIPTIONS OF MAP UNITS 3

bols. Where formations are shown on the 1: 250, 000-scale whereas other named units are represented by two or more geologic map, the map symbol includes a subscripted letter to symbols. References cited for each named unit consist of the distinguish it from other units of similar age and lithology. For citation(s) in which the unit was defined, redefined, or exten­ example, the symbol for the Miocene Saddle Mountains Basalt sively reviewed. Locations given for each named unit are in­ is Mv8 . Subscripted numerals represent map units of similar tended to guide the map user to the 1: 100, 000-scale lithologies, but of slightly different ages. quadrangle(s) in which the named geologic unit occurs. Because the 1 :250,000-scale map units are age-lithologic units, formations consisting of diverse types or ages of rocks SOURCES OF MAP DATA are separated into their component lithologies and/or ages and included in more than one map unit. To determine all map Figures 1 through 4 constitute a series of index maps that units (symbols) by which a named unit (formation, group, or illustrate the areas covered by the sources of geologic mapping data used to compile the 1:250,000-scale geologic map. On supergroup) is shown, consult the List of Named Units on Sheet 2. each of these index maps, numbered areas correspond to abbreviated citations in the figure captions. Complete citations are given in the References Cited. Patterned areas on Figure DESCRIPTIONS OF MAP UNITS 1 indicate areas where authors Reidel and Fecht, assisted by A lithologic description of each unit on the 1:250,000- M. A. Chamness, performed original geologic mapping for the scale geologic map is given in the Descriptions of Map state geologic map project. Author Zurenko performed Units (Sheet 1). Quaternary sediments are described first, original geologic mapping in a small area of Precambrian rock followed by sedimentary rocks and deposits, volcanic rocks, outcrop (unit pCsc) near the head of Rock Lake in the Rosalia intrusive rocks, metasedimentary and metavolcanic rocks, and 1:100,000-scale quadrangle, but this area is too small to show metamorphic rocks. Within each lithologic group, map units on Figure 1. Plate or sheet numbers are specified only for are addressed in order of increasing age. Information concern­ reports that contain more than one map plate or sheet. Some ing the ages and stratigraphic relations of the map units is unpublished maps, cited as unpublished maps in the Refer­ given in the Correlation Diagram (Sheet 2). A tabulation in ences Cited, were used to compile the 1 :250,000-scale the section of this pamphlet titled Correlation Diagram geologic map. They are available for inspection at the presents additional information on the ages of geologic units. Division's Olympia office. Table 2 shows the Distribution of Map Units and Sources of Unit Description Information in the southeast quadrant CORRELATION DIAGRAM of Washington. The age range for each age-lithologic unit on the At the end of each unit description is a list of named 1:250,000-scale geologic map (Sheet 1) is represented by a units, if any, that make up the geologic map unit. Formally colored box on the Correlation Diagram on Sheet 2. The named formations that are included in lexicons published by color, pattern, and unit symbol in each box are the same as the USGS are listed with the word "Formation" or the those for the unit's polygons on the map. Unit symbols on the lithologic term capitalized. For informally named units the diagram can be cross-referenced with the Descriptions of word "formation" or the lithologic term is not capitalized. Map Units (Sheet 1) and the List of Named Units (Sheet Some map units consist of a single formation or part of a 2). Additional information about the ages of geologic units is formation; others are a combination of named and unnamed given in the tabulation below. Stratigraphic relationships units; still others consist only of unnamed age-lithologic units. within the Columbia River Basalt Group are shown in more If the map unit consists entirely of named units, the words detail in Figure 5. "consists of" are applied to the list of names given. If the map unit contains both named and unnamed units, the word "in­ Queries at the top and/or bottom of a box on the diagram cludes" is used. indicate that the upper or lower age limits are uncertain. Sedimentary and volcanic rocks include sub-greenschist We have used the geologic time scale devised for facies low-grade or unmetamorphosed deposits only. the "Correlation of Stratigraphic Units of North America (COSUNA)" project of the American Association of Metasedimentary and metavolcanic rocks are composed of sedimentary and volcanic rocks that have been metamor­ Petroleum Geologists (Salvador, 1985) as the basis for phosed to the greenschist facies. Metamorphic rocks are those this Correlation Diagram. Exceptions are (1) the Eocene­ that have been metamorphosed to the amphibolite facies or Oligocene boundary is placed at 35. 7 Ma (Montanari and higher. others, 1985), (2) the Pliocene-Pleistocene boundary is as­ signed a 1.6 Ma age (Aguirre and Pasini, 1985), and (3) the Proterozoic time scale is from Harrison and Peterman (1982). LIST OF NAMED UNITS The List of Named Units (Sheet 2) is a summary of Quaternary Sedimentary Deposits named geologic units that appear in published literature. The Qd Age inferred from geomorphology, ages of parent list includes all formal and selected informal unit names that materials, and presence of interbedded Mazama tephra are currently in use or widely recognized. Some of the named (about 7 ka, Kittleman, 1973, p. 2958; about 6.85 ka, geologic units are represented on the 1 :250,000-scale Bacon, 1983). geologic map (Sheet 1) by a single symbol (age-lithologic unit), Ola Age inferred from geomorphology and stratigraphic position. 4 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

120° 0 118, , I

------,47°20

Figure 1. Index to sources of map data, scales 1:5,300 through 1:24,000.

EXPLANATION 1. Bentley, R. D.; Powell, J. E., Cent. Wash. Univ., unpub. mapping, 1984 (10 sheets, scale 1:12,000) 12. Hammatt and Blinman, 1977 (scale 1 :24,000) 2. Burlington Environmental, Inc., 1990 (figure 3-1, 13. Hooper, P. R., Wash. State Univ., unpub. mapping, scale 1: 18,000) 1991 (scale 1:24,000) 3. Campbell, N. P., Yakima Valley Coll., unpub. 14. Marshall, 1971 (scale 1:6,600) mapping, 1978a (12 sheets, scale 1:24,000) 15. Price, 1982 (plate 4, scale 1:5,300) 4. Campbell, N. P., Yakima Valley Coll., unpub. 16. Swanson and Helz, 1979 (sheets 4-8, scale 1:24,000) mapping, 1978b (11 sheets, scale 1:24,000) 17. Webster, G. D., Wash. State Univ., unpub. mapping, 5. Campbell, N. P., Yakima Valley Coll., unpub. 1978a (32 sheets, scale 1: 24,000) mapping, 1978c (11 sheets, scale 1:24,000) 18. Webster, G. D., Wash. State Univ., unpub. mapping, 6. Fecht, 1978 (plate 1, scale 1 :24,000) 1978b (29 sheets, scale 1 :24,000) 7. Gillespie, B. A.; Hooper, P.R., Wash. State Univ., 19. Webster, G. D., Wash. State Univ., unpub. mapping, unpub. mapping, 1991 (2 sheets, scale 1:24,000t 1978c (13 sheets, scale 1:24,000) 8. Goff, 1981 (plate 1, scale 1:24,000) 20. Webster, G. D., Wash. State Univ., unpub. mapping, 9. Hagood, 1985 (scale 1:24,000) 1978d (16 sheets, scale 1 :24,000) 10. Hagood, 1986a (scale 1:24,000) 11. Hagood, M. C., Westinghouse Hanford Co., unpub. Patterned area is unpublished mapping for this report by mapping, 1986b (6 sheets, scale 1:24,000) S. P. Reidel and K. R. Fecht, assisted by M. A. Chamness. CORRELATION DIAGRAM 5

... _ I I 3,15

0 117

120°'

Figure 2. Index to sources of map data, scales 1:24,370 through 1:62,500.

EXPLANATION

1. Bentley and others, 1988a (scale 1:48,000) 12. Myers, Price, and others, 1979 (plate Ill-1, 2. Bentley and others, 1988b (scale 1 :48,000) scale 1 :62,500) 3. Bentley and others, 1993 (sheets 1, 3 and 4, 13. Reidel, 1988 (plates 1, 2, and 3, scale 1 :48,000) scale 1:31,680) 14. Reidel and others, 1992 (scale 1 :48,000) 4. Campbell, 1988 (plate 5, scale 1 :62,500) 15. Shannon & Wilson, Inc., 1977 (figure 2R H.7-3, 5. Gard and Waldron, 1954 (scale 1 :62,500) scale 1 :62,500) 6. Golder Associates, Inc., 1992 (figure 4-2, scale 16. Shannon & Wilson, Inc., 1977 (figure 2R H.8-2, about 1:24,370) scale 1 :62,500) 7. Grolier and Bingham, 1971 (scale 1:62,500) 17. Swanson and Wright, 1983 (scale 1:48,000) 8. Hooper, P.R., Wash. State Univ., unpub. mapping, 18. Waldron and Gard, 1954 (scale 1 :62,500) 1986 (scale 1 :48, 000) 19. Waldron and Gard, 1955 (scale 1 :62,500) 9. Hooper and Webster, 1982 (scale 1 :62,500) 20. Webster, G. D., Wash. State Univ., unpub. 10. Hooper and others, 1985 (scale 1:48,000) mapping, 1978c (3 sheets, scale 1:62,500) 11. Myers, 1973 (figure 4, scale 1:31,680) 21. Webster, G. D., Wash. State Univ., unpub. mapping, 1978d (4 sheets, scale 1 :62,500) 6 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

1 120°30 120° 119° 0 1 ', 7 4'/015• ~15;----.~~------~----4~------...:.'r18it 2 ;------147°15'

Figure 3. Index to sources of map data, scale 1:100,000.

EXPLANATION 1. Gulick, 1990a (scale 1:100,000) 10. Schuster, 1993 (scale 1:100,000) 2. Gulick, 1990b (scale 1: 100,000) 11. Schuster, 1994a (scale 1,100,000) 3. Gulick, 1994a (scale 1:100,000) 12. Schuster, 1994b (scale 1:100,000) 4. Gulick, 1994b (scale 1,100,000) 13. Schuster, 1994c (scale 1:100,000) 5. Hays and Schuster, 1983 (scale 1:100,000) 14. Schuster, 1994d (scale 1:100,000) 6. Hays and Schuster, 1987 (scale 1: 100,000) 15. Tabor and others, 1982 (scale 1:100,000) 7. Reidel and Fecht, 1994a (scale 1:100,000) 16. Waggoner, 1990 (scale 1,100,000) 8. Reidel and Fecht, 1994b (scale l: 100,000) 9. Reidel, S. P., Wash. State Univ.; Tolan, T. L., consulting geologist, Kennewick, WA, unpub. mapping, 1991 (scale 1,100,000) CORRELATION DIAGRAM 7

1 0 120°30 0 0 117 120° 118 1 47°151 119 47°15 6,10 4,7

470 ~70 ,1,9 I / F t I ., ' I I 1 1 46° 30 f1 + 46° 30 10 ~· {\ 4

Figure 4. Index to sources of map data, scales 1: 125,000 through 1:250,000.

EXPLANATION 1. Campbell and others, 1979 (scale 1 :250,000) 6. Griggs, 1973 (scale 1 :250,000) 2. Foundation Sciences, Inc., 1980 (plate 2, 7. Hanson and others, 1979 (scale 1 :250,000) scale 1:170,000) 8. Kiver and others, 1979 (scale 1 :250,000) 3. Foundation Sciences, Inc., 1980 (plate 3, scale 1:125,000) 9. Rigby and others, 1979 (plate 7, scale 1 :250,000) 4. Geomatrix Consultants, Inc., 1990 (figure 2, 10. Swanson and others, 1979a (scale 1 :250,000) scale 1,250,000) 11. Swanson and others, 1980 (scale 1 :250,000) 5. Griggs, 1966 (scale 1: 125,000) 8 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

SUB- ISOTOPIC MAGNETIC SERIES GROUP GROUP FORMATION MEMBER AGE(Ma) POLARITY LOWER MONUMENTAL MC:MBER 6 fl ...... ,. ..,. .,,A ",...... /'>• ..,;A ICE HARBOR MEMBER 8 5 basalt of Goose Island -~-·-- ______Ii__ v basalt of Martindale R Q_ basalt of Basin City Q_ Jl. VV'V V' :J BUFORD MEMBER en ELEPHANT MOUNTAII~ M':MBER 10.5 fU z basalt of Ward Ga:) N,T basalt of Elephant Mountain N,T - ~ IA...... A A A.AAA ...... A A..,,A...,A..,,A A.,,A..,,A.,..A.., z ,.P.OlASJ~f: ~f ~~E.R••• . . n. • .R••• V VY ...... ::J~ ESOUATZEL MEMBER IL IA... AA Q<( V • V :::!!:00 WEISSENFELS RIDGE MEMBER <( basalt of Sli[)Qery Creek N WID ·- ....I basalt of Tenmite Creek ·------______Ji__ Cl basalt of Lewiston Orchards N Cl basalt of Cloverland N <( ASOTIN MEMBER en 13 N basalt of Hun\zing er a.. IA.,.;"'•,,,,;""•..,,A ..,,: ... ,.. ,A..,, A..,, A..,, A.., A .. ,,;A.,,A..., A.,, ..,, ,.. .,.;A.,.:"'•. .,,;A . .,,;A A..,,A..,,A,,,;"'• A.,,A.,,A..,A..,A ::J WILBUR CREEK MEMBrn N 0 a.. basalt of LO[)WOi a: ::J (!) •• pg_s.911 .o! .w.o~tl'~e ...... •• N••• 0 VV'V'VVV'YV'VYYYYV vvv V a: UMATILLA MEMBER ~ (!) basalt of Sillusi N <( ID basalt of Umatilla I~ AAAAAAAAAAAAAAAAAAAA A...,:A A..,;"'\.,A en ::J ...... V V V <( w en PRIEST RAPIDS MEMBrn z _QJ ID basal\ of Lolo 14.5 R w u u cJ 1 0 0 R a: ~ .... A ~~s~ 1 .... 1 ....R;:;.. li~ ...... A ... A AA 2 E <( ...... : ...... : ...... ,: .. ::::.C w ROZAMEMBERVVVVVVVVVTV .vff.v. > en ,,.,,.,,.,,.,,.,,.,,.,,.,,.,,.,,.,,.,,.,,.& .. &A&A .. A ...... vvv vvv ,,.,,...... <( FRENCHMAN SPRINGS IAEMBER a: ID :::!!: ::J~ basalt of Lyons Fc-rrv N ---- ::s <( O..<( basalt of SentineJ_Gao N ID ~

w / Umtanum unit Cl Ortley unit z ~ Armstrong Canyon unit 0~ CC<( Meyer Ridge unit Oen Grouse Creek unit R2 z< Wapshitta Ridge urit <(ID Mt. Horrible unit a: China Creek unit (!) --:7 NI Downey Gulch unit L__ Center Creek unit Rogersburg unit RI TEEPEE BUTTE MDABEf; - Buckhorn Springs unit 16.9 17.0 ~1___ v IMNAHA See Hooper and others T 3 (1984) for tmnal a units t, S! BASALT 0 i 7 -3 Ro

Figure 5. Generalized nomenclature and stratigraphic relations of Columbia River basalt units. Modified from Reidel and others (1989). CORRELATION DIAGRAM 9

Qa Age of streambed deposits inferred from paleomag­ Qfg In the Priest Rapids and Richland 1: 100,000 quad­ netics, geomorphology, ages of parent materials, and rangles the unit has been divided into four subunits on the presence of Mazama tephra (about 7 ka, Kittleman, the basis of magnetic polarity, presence of tephra beds, 1973; about 6.85 ka, Bacon, 1983), Mount St. Helens pedogenic carbonate development, and stratigraphic set S tephra (about 13 ka; Mullineaux and others, position; the oldest and second oldest subunits are 1978, p. 178) and Glacier Peak tephras G and B (about capped by pedogenic carbonate and cambic soil 11.25 ka; Mack and others 1983; Mehringer and horizons; contains Mount St. Helens set S tephra (13 others, 1984). Age of alluvial fans inferred from ka); same age as outburst flood deposits, silt and sand geomorphology, absence of caliche, and ages of parent (unit Qfs). materials; fans located below maximum elevation of glacial Lake Missoula outburst flooding are younger Sedimentary Rocks and Deposits than the outburst flood deposits and are, therefore, Qli'ls Age poorly constrained; younger than members of mid­ Holocene; fans located above the maximum elevation dle and upper Miocene Saddle Mountains Basalt that of Pleistocene outburst flooding are Holocene or older; are involved in the landslides; here assumed to be post­ includes older alluvial fans (shown elsewhere as unit Qoa) in the Priest Rapids and Richland 1:100,000 Miocene. quadrangles. Qli'cg Overbank facies has reversed magnetic polarity (Van Alstine, 1982); underlies oldest Pleistocene outburst Qls Age inferred from geomorphology, stratigraphic posi­ flood deposits (top scoured by Pleistocene outburst tion, pedogenic carbonate development, and ages of floods); overlies Ringold Formation and Ice Harbor parent materials. Member of Saddle Mountains Basalt; age is greater Qoa Age inferred from geomorphology, degree of cement­ than about 1 Ma and less than 3 Ma. ing, and caliche development. QMcg Older than glacial Lake Missoula outburst flood and/or Qt Age inferred from geomorphology. Bonneville flood deposits and younger than the Lower Qfb Swanson (1984, p. 49-52) suggests an age of 15 ka Monumental Member and/or Pomona Member (older based on 14C age estimates, sedimentology, and than about 19 ka and younger than 12 Ma; most biostratigraphy in the Lake Bonneville area and gravels probably younger than 6 Ma) (Hooper and stratigraphic position of deposits beneath glacial Lake others, 1985; Reidel and others, 1992). Missoula outburst flood deposits in the Lewiston area; Reg The gravels have yielded fission-track ages of 3.64 ± radiocarbon dates from wood collected in Lake Bon­ 0. 74 and 3. 70 ± 0.2 Ma and are thought to lie wholly neville paleodeltas are 14-15 ka (Scott and others, within the Pliocene (Waitt, 1979, p. 11). 1982); Scott and Shroba (1980) estimate an age of RMc Overlain by unconsolidated Pliocene and Pleistocene 10-15 ka for soils buried by Bonneville deposits. deposits and underlain by the Ice Harbor Member of QI Paleomagnetic measurements show that the second the Saddle Mountains Basalt (Fecht and others, 1985; oldest loess unit in the Priest Rapids and Richland Lindsey, 1991), which was dated at 8.5 Ma by McKee 1: 100,000 quadrangles was deposited during the and others (1977). At the White Bluffs, the lower 20 m Matuyama Reversed-Polarity Chron (at least 790 ka), of the Ringold has normal magnetic polarity, and the and the oldest loess unit is commonly capped by upper 100 m has reversed polarity (Packer and silcrete and is early Pleistocene or perhaps late Johnston, 1979; Rigby and others, 1979). Vertebrate Pliocene in age (Reidel and Fecht, 1994a, 1994b); fossils (Gustafson, 1978; Strand and Hough, 1952) uppermost loess locally contains Mazama tephra and magnetic polarity data indicate that the unit is (Foley, 1982, p. 90), about 6.85-7 ka (Kittleman, older than 3.4 Ma (Fecht and others, 1985, p. 37). 1973; Bacon, 1983); locally contains Glacier Peak G RMcg Age is the same as unit RMc. and B tephras (about 11.25 ka), Mount St. Helens S (13 ka; Mullineaux and others, 1978) and M (about RMa Age inferred from geomorphology, variable induration 20 ka; Smith, 1980) tephras. with pedogenic carbonate, and ages of parent materials. Qfs Youngest deposits are from floods that originated from ice dams along the Columbia River and are no older Mc Older than the overlying Thorp Gravel (unit Reg, see than the age of retreat of the ice from the Columbia discussion of age above); younger than the underlying River valley; most of the unit is associated with the last unit of the Columbia River Basalt Group (units Mvs, advance of the continental ice sheet and is thought to Mvw, or Mvg, see discussions of age below); Campbell be younger than about 19 ka and older than about 11 ka and Reidel (1991) place the age range of the Ellensburg on the basis of 14C determinations that constrain the Formation between 16.5 million and about 5 million ages of advance and retreat of the Columbia ice lobe years. in southernmost British Columbia (Wait!, 1980); Mount Meg Interfingers with other fluvial and laharic deposits of St. Helens set S tephra, with an isotopic age estimate the Ellensburg Formation, overlies the Priest Rapids of 13 ka (Mullineaux and others, 1978), occurs below Member of the Wanapum Basalt or one of the members the top of the unit (Wait!, 1980); in the Priest Rapids of the Saddle Mountains Basalt, underlies the Pliocene and Richland 1:100,000 quadrangles the unit has been Thorp Gravel (unit Reg), and is upper or middle divided into four time-stratigraphic subunits on the Miocene in age. In the Orofino 1: 100,000 quadrangle basis of magnetic polarity, presence of tephra beds, underlies the lower Miocene lmnaha Basalt and is as­ pedogenic carbonate and other soil development, and sumed to be early Miocene in age. stratigraphic position; the second oldest of these sub­ Ee, Northwest of the map area, in the Wenatchee units is capped by pedogenic carbonate (stage III or IV 1: 100,000-scale quadrangle, contains tuffs that yielded of Machette, 1985), and the oldest has reversed mag­ ages of 49-50 Ma (Tabor and others, 1982). netic polarity and is at least 790 ka (Reidel and Fecht 1994a, 1994b). Jm Callovian to Oxfordian age on the basis of ammonites (Vallier, 1977, p. 51). 10 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

Volcanic Rocks vironment, but others believe that these pure quartzites are unlike the relatively impure, laminated, micaceous Columbia River Basalt Group quartzites typical of the Belt Supergroup and have in­ Mv. Saddle Mountains Basalt. Lower Monumental Member stead tentatively correlated "orthoquartzites of Kamiak has yielded a K-Ar age of approximately 6 Ma (McKee Butte type" with similar Upper Proterozoic to Lower and others, 1977). Ice Harbor Member is about Cambrian quartzites (Addy and Gypsy Quartzites) of 8. 5 Ma, based on K-Ar age estimates (McKee and northeastern Washington (Hooper and Webster, 1982). others, 1977). Elephant Mountain Member has We show the Belt Supergroup correlation as far south produced K-Ar age estimates of 10.5 Ma (McKee and as the southern boundary of the Rosalia 1:100,000 others, 1977) and 9.4 ± 0.7 Ma and 10.7 ± 0.8 Ma quadrangle (units Yms4 and Yms2), following the usage (Stoffel, 1984). The Pomona Member has been isotopi­ of Waggoner (1990). Farther south, we show the rocks cally dated at 12 Ma (K-Ar method) by McKee and as pKq, following neither the Belt nor the Addy/Gypsy others (1977) and 12 Ma (40Ar-39Ar method) (S. P. correlation because of the distance from known Belt or Reidel, Wash. State Univ., unpub. data, 1991). Asotin Addy/Gypsy rocks. Member was K-Ar dated at 13 Ma by Reidel and Fecht RCb Norian age on the basis of ammonites (Vallier, 1977, (1987, p. 666). Overlies the Priest Rapids Member of p. 50). the Wanapum Basalt, which has been K-Ar dated at 14.5 Ma (Tolan and others, 1989). Amt Doyle Creek Formation is Karnian and possibly early Norian age on the basis of Karnian fossils in the under­ Mvw Wanapum Basalt. Priest Rapids Member K-Ar dated at lying Wild Sheep Creek Formation and Norian fossils 14.5 Ma (Tolan and others, 1989). The basalt of Sand in the overlying Martin Bridge Limestone (Vallier, Hollow, a flow in the Frenchman Springs Member, 1977, p. 44-45). Wild Sheep Creek Formation is yielded an isotopic age estimate of 15.3 Ma (Tolan and Ladinian to Karnian age on the basis of ammonites and others, 1989). Overlies the Grande Ronde Basalt, pelecypods (Vallier, 1977, p. 36). which is as young as 15.6 Ma. Yms4 Considered Precambrian Y on the basis of a possible Mv Grande Ronde Basalt. Isotopically (K-Ar; 40Ar-39Ar) 9 lithologic correlation with the Striped Peak Formation, dated at about 15.6 to 16.9 Ma (Baksi, 1989, p. 109; Missoula Group, Belt Supergroup (Waggoner, 1990). age information summarized by Reidel and others, 1989). Yms2 Considered Precambrian Y on the basis of a correlation with the undivided Revet! and Burke Formations, Raval­ Mvi Same age as non-invasive Grande Ronde Basalt (Mvg). 9 li Group, Belt Supergroup, made by Griggs (1973). Mv; Imnaha Basalt. K-Ar age 17.3-17.0 Ma (Baksi, 1989, (See further discussion above under pKq.) p. 109). Metamorphic Rocks Intrusive Rocks pCsc Overlain by the Grande Ronde Basalt. Considered Kia At Viola, Idaho (northwest end of Moscow Mountain), Precambrian on the basis of a possible correlation with unit yielded a K-Ar age estimate of 67.8 ± 2.5 Ma the Precambrian Y Prichard Formation, the lowest for­ (Geochron No. B-4991)(Webster and Nunez, 1982). mation of the Belt Supergroup (Waggoner, 1990). Kigd Underlies magnetostratigraphic unit Nl of the Grande Ronde Basalt. Occurrence is the westernmost of several DISTRIBUTION OF MAP UNITS AND Cretaceous igneous stocks that include the mon­ zodiorite on Paradise Ridge (in Idaho), the tonalite (unit SOURCES OF UNIT DESCRIPTION Kit) of Bald Butte, and the granodiorite (unit Kia) at and INFORMATION near Viola, Idaho, 11 miles (18 km) northeast of Pullman. Owing to similarity to these Cretaceous silicic Table 2 on the following pages shows the distribution of igneous stocks to the east, a Cretaceous age is likely. each geologic unit in southeastern Washington. Distribution is Kit A sample from the Chambers Road-U.S. Highway 195 shown by indicating the 1: 100 ,000-scale quadrangle(s) in junction (in Idaho) yielded a K-Ar age of 69.8 ± 2.6 Ma which each geologic unit occurs. Because this information was (Geochron No. B-4992) (Hooper and Webster, 1982). compiled from 1:100,000-scale quadrangle reports (listed in KJi A Cretaceous or Jurassic age was assigned because the Table 1), the 1 :250,000-scale geologic map on Sheet 1 does unit is slightly metamorphosed and intrudes Triassic not show precisely the same distribution, owing to the elimina­ and Jurassic rocks. tion of some small occurrences during the compilation process. Table 2 also lists the sources of information from Metasedimentary and Metavolcanic Rocks which the unit descriptions were compiled. Full references to these sources can be found in References Cited. pTmt Age unknown. Unconformably overlain by Grande Ronde Basalt. Assigned a pre-Tertiary age because the unit is metamorphosed (greenschist facies). EDGE MATCHES WITH OTHER STATE pKq Intruded by Cretaceous intrusive rocks. Savage (1973) GEOLOGIC QUADRANT MAPS assigned rocks of Kamiak Butte and other quartzite steptoes to the Precambrian Belt Supergroup (Ravalli Geologic units on the north and west edges of the Group, Revett Formation). Griggs (1973) assigned southeast-quadrant 1:250,000-scale geologic map match well similar rocks in the Spokane 1: 250, 000-scale quad­ with the geologic units shown on the south edge of the rangle to the Revet! and Burke Formations. Savage geologic map of the northeast quadrant of Washington (Stoffel suggested that Kamiak Butte and similar steptoes are and others, 1991) and with the units along the east edge of block-faulted remnants isolated from the main mass of the geologic map of the southwest quadrant (Walsh and the northern Rocky Mountains and that the sediments others, 1987). originally formed in a shallow, shoreline-intertidal en- EDGE MATCHES WITH OTHER STATE GEOLOGIC QUADRANT MAPS 11

Table 2. Distribution of map units and sources of unit description information. 1: 100,000 quadrangle abbreviations: CL, Clarkston; CO, Connell; GO, Goldendale; HE, Hermiston; ML, Moses Lake; OR, Orofino; PR, Priest Rapids; PU, Pullman; RI, Richland; RT, Ritzville; RO, Rosalia; TO, Toppenish; WW, Walla Walla; WE, Wenatchee; YA, Yakima. Although the members of the Columbia River Basalt Group formations are not divided out on the geologic map (Sheet 1), their distribution is included here. See Figure 5 for the stratigraphic position of the members

1:100,000- 1:100,000- Map scale Sources of Map scale Sources of unit quadrangle(s) unit description information unit quadrangle(s) unit description information

Qd CO,GO,HE, Grolier and Bingham, 1971; Myers, Qfg All except CL, Baker and others, 1991; Grolier and ML,PR,PU, Price, and others, 1979; Reidel and OR,TO Bingham, 1965, 1971; Myers, Price, RI, WW, WE Fecht, 1994a, 1994b; Rigby and and others, 1979; Reidel and Fecht others, 1979 1994a, 1994b; Rigby and others, Ola CO,PU Rigby and others, .1979 1979 Oa All Baker and others, 1991; Bentley and Oft>ls CL, OR Hooper and others, 1985; Reidel and others, 1988a, 1988b, 1993; Hooper others, 1992 and others, 1985; Hooper and Qft>cg PR, RI Reidel, 1988; Reidel and Fecht, Webster, 1982; Myers, Price, and 1994a, 1994b others, 1979; Reidel and Fecht, OMcg CL, CO, OR, Hooper and others, 1985; Reidel and 1994a, 1994b; Reidel and others, PU,WW others, 1992; Rigby and others, 1979 1992; Rigby and others, 1979; Swan­ Reg WE, YA Bentley and others, 1993; Rigby and son and others, 1980; Swanson and others, 1979; Waitt, 1979 Wright, 1983 ft>Mc CO, ML, PR, Grolier and Bingham, 1971, 1978; Ols All Bentley and others, 1988a, 1988b, Rl,RT,WW, Lindsey, 1991; Myers, Price, and 1993; Fecht, 1978; Grolier and Bin­ YA others, 1979; Newcomb and others, gham, 1971; Hanson and others, 1972; Rigby and others, 1979 1979; Hooper and others, 1985; Myers, Price, and others, 1979; ft>Mcg ML, PR, RI, Grolier and Bingham, 1978; Lindsey, Reidel, 1988; Reidel and Fecht, WW,YA 1991; Myers, Price, and others, 1979; 1994a, 1994b; Rigby and others, Newcomb and others, 1972; Rigby 1979; Swanson and others, 1979a; and others, 1979 Swanson and Wright, 1983 ft>Ma PR Myers, Price, and others, 1979; Qoa TO,YA Bentley and others, 1988a, 1988b, Reidel, 1988; Rigby and others, 1979 1993 Mc GO, HE, PR, Bentley and others, 1988a, 1988b, Qt GO, HE, PU, Bentley and others, 1993; Rigby and PU, RI, TO, 1993; Hooper and others, 1985; TO, WE, YA others, 1979 WE, YA Reidel and Fecht, 1981, 1994a, 1994b; Reidel and others, 1992; CL,CO,OR, Hooper and others, 1985; Hooper and Smith, 1988; Swanson and others, PU Webster, 1982; Reidel and others, 1979a; Swanson and Wright, 1983 1992 Meg GO, HE, PR, Bentley and others, 1988a, 1988b, QI All Baker and others, 1991; Bentley and TO.YA 1993; Reidel, 1988; Reidel and others, 1988a, 1988b, 1993; Grolier others, 1992; Smith, 1988; Swanson and Bingham, 19 71; Hooper and and others, 1979a others, 1985; Hooper and Webster, 1982; P. R. Hooper, Wash. State Ee, WE Tabor and others, 1982 Univ., unpub. mapping, 1986; Mc­ Jm OR Morrison, 1964; Reidel and others, Donald and Busacca, 1989; Myers, 1992; Vallier and Hooper, 1976; Val- Price, and others, 1979; Reidel and lier, 1977 Fecht, 1994a, 1994b; Reidel and Mv. (Saddle Mountains Basalt) others, 1992; Rigby and others, 1979 Lower Monumental Member Ofs All except RO Baker and others, 1991; Bentley and CL, CO, PU Swanson and others, 1980; Hooper others, 1988a, 1988b, 1993; Grolier and others, 1985 and Bingham, 1971; Hanson and others, 1979; Hooper and others, lee Harbor Member 1985; Hooper and Webster. 1982; PR.RI, WW Myers, Price, and others, 1979; Swan­ Myers, Price, and others, 1979; Reidel son and Helz, 1979; Swanson and and Fecht, 1994a, 1994b; Reidel and others, 1980 others, 1992; Rigby and others, 1979; Buford Member Van Alstine, 1982 CL Hooper and others, 1985; Reidel and others, 1992; Swanson and others, 1980 12 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

Table 2. Distribution of map units and sources of unit description information (continued)

1:100,000- 1:100,000- Map scale Sources of Map scale Sources of unit quadrangle(s) unit description information unit quadrangle(s) unit description information

Elephant Mountain Member others, 1979; Reidel and Fecht, 1981; CL, CO, GO, Bentley and others, 1988a, 1988b, Reidel and others, 1992; Swanson and HE, OR, PR, 1983; P. R. Hooper, Wash. State others, 1979a, 1980 RI, TO, WW, Univ., unpub. mapping, 1986; Hooper Roza Member YA and others, 1985; Myers, Price, and All except HE Bentley and others, 1988a, 1988b, others, 1979; Reidel and others, 1993; Grolier and Bingham, 1978; P. 1992; Swanson and others, 1979a, R. Hooper, Wash. State Univ., unpub. 1980; Swanson and Wright, 1983 mapping, 1986; Hooper and others, Pomona Member 1985; Hooper and Webster, 1982; CL, CO, GO, Bentley and others, 1988a, 1988b, Martin, 1989; Myers, Price, and HE,PR,PU,RI, 1993; Hooper and others, 1985; others, 1979; Reidel and Fecht, 1981; TO, WW, YA Swanson and others, 1979a, 1980 Reidel and others, 1992; Swanson and Esquatzel Member others, 1979a, 1979b, 1980 CO,PR,PU, Bentley and others, 1993; Myers, Frenchman Springs Member RI, YA Price, and others, 1979; Reidel and All except OR, Beeson and others, 1985; Bentley and Fecht, 1981; Swanson and others, RO others, 1988a, 1988b, 1993; Grolier 1979a, 1979b, 1980 and Bingham, 1978; Myers, Price, and Weissenfels Ridge Member others, 1979; Reidel and Fecht, 1981; Swanson and others, 1979a, 1979b, CL, OR, PU, Hooper and others, 1985; Hooper and 1980; Swanson and Wright, 1983 RO Webster, 1982; Reidel and others, 1992; Swanson and others, 1979a, Eckler Mountain Member 1980 CL, OR, PU, WW Asotin Member Hooper and others, 1985; Reidel and CL,CO,OR, Bentley and others, 1993; P. R. others, 1992; Swanson and others, PR, PU, YA Hooper, Wash. State Univ., unpub. 1980; Swanson and Wright, 1983 mapping, 1986; Hooper and others, Mv (Grande Ronde Basalt) 1985; Hooper and Webster, 1982; 9 N AllexceptHE, Camp and others, 1978; P.R. Myers, Price, and others, 1979; Reidel 2 OR, RT, TO Hooper, Wash. State Univ., unpub. and Fecht, 1981, 1987; Reidel and mapping, 1986; Hooper and others, others, 1992; Swanson and others, 1985; Reidel, 1983; Reidel and 1979a, 1979b, 1980 others, 1989, 1992; Swanson and Wilbur Creek Member others, 1979a, 1979b, 1980; Swan­ CL, CO, OR, Bentley and others, 1993; Hooper and son and Wright 1983 PR,PU,YA others, 1985; Hooper and Webster, CL, ML,OR, Same as N2 1982; Myers, Price, and others, PR,PU,WW, 1979; Reidel and Fecht, 1981, 1987; WE, YA Reidel and others, 1992; Swanson and CL, OR, PU, others, 1979a, 1979b, 1980 Same as N2 WW,WE Umati/la Member CL.OR, PU, Same as N2 CL,GO,HE, Bentley and others, 1988a, 1988b, WW,WE OR, PR, PU, 1993; P. R. Hooper, Wash. State Mvi WE Tabor and others, 1982 RI, TO,WW, Univ., unpub. mapping, 1986; Hooper 9 YA and others, 1985; Hooper and Mv; CL.OR Hooper and others, 1985; Reidel and Webster, 1982; Reidel and Fecht, others, 1992; Swanson and others, 1981; Myers, Price, and others, 1979; 1980 Reidel and others, 1992; Swanson and Kia PU Rigby and others, 1979 others, 1979a, 1980 Kigd PU Hammatt and Blinman, 1976; Hooper Mvw (Wanapum Basalt) and Rosenberg, 1970; Shedd, 1903; Priest Rapids Member Treasher, 1925 All Bentley and others, 1988a, 1988b, Kit PU Hoffman, 1932; Hooper and Webster, 1993; P. R. Hooper, Wash. State 1982 Univ., unpub. mapping, 1986; Hooper KJi OR Reidel and others, 1992; Vallier and and others, 1985; Hooper and Hooper, 1976) Webster, 1982; Myers, Price, and pTmt CL Swanson and others, 1980 BEDROCK GEOLOGIC AND TECTONIC MAP OF THE SOUTHEAST QUADRANT 13

Table 2. Distribution of map units and sources of quadrant map does not show the folds because they extend unit description information (continued) only a short distance into the northeast quadrant. In other instances the reasons why the folds were not shown on the northeast quadrant are not apparent. 1:100,000- Map scale Sources of BEDROCK GEOLOGIC AND TECTONIC MAP unit quadrangle{s) unit description information OF THE SOUTHEAST QUADRANT pKq PU Hooper and Webster, 1982; Webster The 1 :625,000-scale Bedrock Geologic and Tectonic and Nunez, 1982; Savage, 1973; Map on Sheet 2 is a simplified version of the 1 :250,000-scale Treasher, 1925 geologic map (Sheet 1). This map omits unconsolidated F!Cb OR Reidel and others, 1992; Vallier, sedimentary deposits and combines similar bedrock geologic 1977; Vallier and Hooper, 1976 units for simplicity. The simplified design of geologic units allows other elements of the geology, such as folds, faults, and OR Reidel and others, 1992; Vallier, l!mt dikes to show more clearly. Because the bedrock geologic 1977; Vallier and Hooper, 1976 units have been combined, the colors used on this map differ Yms4 RO Waggoner, 1990 from those on Sheet 1. Yms2 RO Waggoner, 1 990 pCsc RO Waggoner, 1990 ADDITIONAL INFORMATION ABOUT MEMBERS OF THE COLUMBIA RIVER BASALT GROUP Faults match well between the southeast· and northeast· The members of the formations in the Columbia River quadrant maps. Fault locations match relatively well between Basalt Group are· not shown on the geologic map (Sheet 1 ). the southeast and southwest quadrants, but there are some The following descriptive information supplements that given apparent changes in the type of fault. These changes are not in the Descriptions of Map Units on Sheet 1. See Figure 5 compilation errors, but reflections of differences in interpreta· for the stratigraphic positions of these units. tion between different source-map authors or between the same authors' maps published at different times. Many of Saddle Mountains Basalt these apparent fault-type changes are also present on the Lower Monumental Member-Single flow; nearly aphyric; structure map of the Columbia Basin by Tolan and Reidel (1989). There is, as yet, no new mapping available to resolve microphenocrysts of olivine in opaque glass; rare these differences. plagioclase phenocrysts as long as 10 mm; normal mag· netic polarity (Choiniere and Swanson, 1979); occurs as an Folds match well between the northeast and southeast intracanyon flow along the Snake River. 1 :250,000-scale quadrant maps, except for a syncline located Ice Harbor Member-Flows, vents, northwest-trending feeder just west of the Columbia River that is shown on the southeast quadrant map, but, for unknown reasons, not on the northeast dikes, and minor tephra; plagioclase phenocrysts common· quadrant map. The syncline is clearly shown extending into ly more tabular (needlelike in cross section) than in other Saddle Mountains Basalt flows; consists of three informal the northeast quadrant on the source map used for both quad· rant maps (Tabor and others, 1982). An anticline on Ahtanum units, from top to bottom, basalt of Goose Island with Ridge, south of Yakima, is shown on the southwest quadrant low-latitude normal magnetic polarity (Choiniere and Swan· geologic map, but not on the southeast quadrant map. The son, 1979), basalt of Martindale with reversed magnetic fold apparently ends at the boundary between the two maps, polarity (Choiniere and Swanson, 1979), and basalt of because the geologic map by Bentley and others (1993) does Basin City with normal magnetic polarity (Choiniere and Swanson, 1979); feeder dikes occur near Ice Harbor Dam not show the fold extending east of 120°30'W. Differences in folds between the southeast and southwest quadrant maps in the Walla Walla 1:100,000 quadrangle and near Basin City in the Priest Rapids 1:100,000 quadrangle. south of 46°N are, like the differences between faults, due to differences between interpretations by different source-map Buford Member-Medium-grained aphyric flow; contains authors at different times, and newer mapping is not yet sparse, small plagioclase phenocrysts in some places; available to resolve the differences. reversed magnetic polarity (Swanson and others, 1979a, Although it is not an edge-match problem, the reader 1979b). should be aware that the age of the Ringold Formation has Elephant Mountain Member-Two aphyric to sparsely been reinterpreted since the northeast-quadrant 1:250,000- plagioclase·phyric flows, informally called the Ward Gap scale geologic map was published. On the northeast-quadrant flow (upper) and the Elephant Mountain flow (lower); abun· map (Stoffel and others, 1991) the Ringold was represented dant plagioclase microphenocrysts; fine· to coarse-grained as Pleistocene-Pliocene in age (unit symbol QRcg). The Rin­ to glassy; locally diktytaxitic; normal to transitional mag· gold is now interpreted as Pliocene-Miocene in age (Lindsey, netic polarity (Rietman, 1966; Choiniere and Swanson, 1991), and is shown as units Ji>Mc and Ji>Mcg. 1979; Reidel and Fecht, 1981). The 1 :625,000-scale geologic maps for the northeast and Pomona Member-One or two fine· to medium-grained flows; southeast quadrants differ in that the southeast quadrant sparsely to slightly phyric with small phenocrysts of shows several folds that do not appear on the northeast quad· plagioclase (generally less than 5 mm long and commonly rant map. In some instances, it appears that the northeast wedge shaped), clinopyroxene, and olivine; locally contains 14 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

large clots (as much as 100 mm or more across) of Ronde River canyon, Clarkston 1: 100,000 quadrangle; plagioclase, pyroxene (including rare hypersthene), and also includes the Bear Creek flow of Ross (1978, 1989) in olivine thought by Swanson and others (1980) to have the Clarkston 1: 100,000 quadrangle. formed during crystallization after eruption; reversed magnetic polarity (Choiniere and Swanson, 1979; Reidel Wanapum Basalt and others, 1984 ); invasive contacts with Ellensburg For­ Priest Rapids Member-Two or more flows in most places; mation (unit Mc) common. aphyric, with rare but prominent plagioclase phenocrysts Esquatzel Member-One to two or more flows or flow units; generally less than 5 mm long but rarely as much as 10 mm sparsely phyric with irregularly distributed phenocrysts of long; matrix of intergranular pyroxene, ilmenite blades, plagioclase and clinopyroxene less than 5 mm in diameter; and some devitrified glass; local diabasic texture and peg­ locally contains hyaloclastite; fine-grained; locally dik­ matoids in top flow; in the Walla Walla 1:100,000 quad­ tytaxitic; normal magnetic polarity (Choiniere and Swan­ rangle olivine phenocrysts 0.5-1 mm in diameter; fine- to son, 1979; Reidel and Fecht, 1981); no known feeder coarse-grained, lower flows generally coarser grained than dikes. upper flow; locally finely diktytaxitic; reversed magnetic Weissenfels Ridge Member-As many as four flows, not co-ex­ polarity (Rietman, 1966); major feeder dikes to the east in tensive, distinguished from each other in the field by size, the Clearwater embayment (Camp, 1981); upper flow is character, and relative abundance of plagioclase and/or informally named the basalt of Lolo and the lower flows the olivine phenocrysts; fine- to medium-grained; normal mag­ basalt of Rosalia. netic polarity; in the Clarkston and Orofino 1: 100,000 Roza Member-One or two flows over wide areas; as many as quadrangles includes the basalts of Slippery Creek, Tenmile six or seven flows, especially near vents; 0.5- to 1-cm Creek, Lewiston Orchards, and Cloverland (Fig. 5); in the plagioclase phenocrysts and glomerocrysts, commonly Pullman 1:100,000 quadrangle represented by the basalt several hundred phenocrysts per square meter of flow sur­ of Lewiston Orchards; in the Rosalia 1: 100,000 quad­ face; microphenocrysts of olivine and augite; fine- to rangle represented by the basalt of Sprague Lake, which is coarse-grained; locally diktytaxitic; transitional to reversed probably correlative with the basalt of Lewiston Orchards; magnetic polarity (Rietman, 1966; Choiniere and Swan­ feeder dikes occur in the eastern part of the Clarkston son, 1979); feeder dikes in the Grande Ronde River and 1: 100,000 quadrangle and in the Orofino 1: 100,000 Asotin Creek canyons in the Clarkston 1:100,000 quad­ quadrangle. rangle, and extending through the Snake River canyon to Asotin Member-Dense, sparsely olivine- and plagioclase­ the northwest as far as Winona in the northwest part of the phyric flow; plagioclase phenocrysts less than 3 mm long, Pullman 1:100,000 quadrangle; Big Butte and Little Butte olivine phenocrysts less than 2 mm long; subophitic augite in the Clarkston 1: 100,000 quadrangle are two of the in coarser grained zones; includes associated sediments; more southerly of many Roza vents; because of its large commonly invasive into sediments; glassy, fine- to coarse­ and nearly ubiquitous plagioclase phenocrysts and wide grained; locally ophitic and diktytaxitic; normal magnetic distribution, the member is a key marker unit across much polarity (Camp, 1976; Choiniere and Swanson, 1979; of the Columbia Basin. Reidel and Fecht, 1981; Swanson and others, 1977, Frenchman Springs Member-Six or more flows; lower flow(s) 1979a, 1980); no known feeder dike; locally mixed with generally more phyric than middle and upper flows; Wilbur Creek Member to form Huntzinger flow, indicating aphyric flows are fine grained, phyric flow(s) are fine to nearly simultaneous eruption of the two members (Reidel medium grained and sparsely to abundantly plagioclase and Fecht, 1987). phyric; many flows contain plagioclase glomerocrysts as Wilbur Creek Member-Two or more flows; aphyric to sparse­ much as 50 mm across; aphyric or nearly aphyric flows ly plagioclase-phyric; sparse, large, locally skeletal resemble the Grande Ronde Basalt; includes saprolite in plagioclase phenocrysts and scarce olivine micropheno­ places; subarkosic sedimentary rocks commonly occur at crysts; fine- to coarse-grained to glassy; normal magnetic the base of the member; excursional to normal magnetic polarity (Choiniere and Swanson, 1979; Reidel and Fecht, polarity (Rietman, 1966; Swanson and others, 1980; 1981; Swanson and others, 1979a, 1980); no known Swanson and Wright, 1983); feeder dikes occur in the feeder dike; locally mixed with Asotin Member to form Connell, Pullman, and Walla Walla 1:100,000 quad­ Huntzinger flow, indicating nearly simultaneous eruption of rangles. the two members (Reidel and Fecht, 1987); consists of an Includes six informal units defined by Beeson and others upper subunit called the basalt of Lapwai, which occurs (1985): basalt of Lyons Ferry; basalt of Sentinel Gap (Sen­ only in Idaho, and a lower subunit called the basalt of tinel Gap flows and Union Gap flows of Bentley and others, Wahluke (Reidel and Fecht, 1987). 1988a, 1988b, 1993); basalt of Sand Hollow (Kelley Hol­ Umatilla Member-Two or more flows; aphyric to sparse low flow and Sand Hollow flow of Bentley and others, plagioclase phenocrysts as much as O. 7 cm across; glassy 1988a, 1988b, 1993); basalt of Silver Falls; basalt of to very fine grained to fine grained, locally medium­ Ginkgo (Ginkgo flows of Bentley and others, 1988a, grained; normal magnetic polarity (Rietman, 1966; Swan­ 1988b, 1993); and basalt of Palouse Falls. son and others, 1977, 1979a); consists of an upper subunit Eckler Mountain Member-Three flow sequences: upper flow called the basalt of Sillusi and a lower subunit called the or flows (basalt of Shumaker Creek) fine-grained and basalt of Umatilla; flows of the two subunits are known to aphyric; middle one to three flows (basalt of Dodge) very physically mix in the Priest Rapids and Richland 1: 100,000 coarse grained, olivine-bearing, plagioclase-phyric, quadrangles, forming one cooling unit (Reidel and Fecht, spheroidal- and yellow-weathering, commonly weathers to 1987); feeder dike for Sillusi flow occurs in the Grande grus, much olivine altered to clay; lower flow (basalt of REFERENCES CITED 15

Robinette Mountain) olivine-phyric, coarse-grained, dik­ Beeson, M. H.; Fecht, K. R.; Reidel, S. P.; Tolan, T. L., tytaxitic, distinguished from middle flows by lack of large 1985, Regional correlations within the Frenchman Springs plagioclase phenocrysts, diktytaxitic texture, and lack of Member of the Columbia River Basalt Group-New insights grusy weathering; normal magnetic polarity (Choiniere and into the middle Miocene tectonics of northwestern Oregon: Swanson, 1979; Swanson and others, 1980); feeder dikes Oregon Geology, v. 47, no. 8, p. 87-96. in the southern part of the Clarkston 1: 100,000 quad­ Bentley, R. D.; Powell, J. E., 1984, Central Washington rangle and in Oregon; saprolites and, in places, sedimen­ University: unpublished geologic maps covering most of tary interbeds above and below; coarse grain size, the northeast quarter of the Yakima 1:100,000 quad­ plagioclase phenocrysts, and spheroidal and yellow rangle, 10 sheets, scale 1:12,000. weathering make the basalt of Dodge an especially useful Bentley, R. D.; Campbell, N. P.; Powell, J. E., 1988a, marker unit. Geologic map of the Bluelight 15-minute quadrangle, Washington: Washington Division of Geology and Earth Reidel and others (1992, p. 5) suggest that the basalt of Resources Geologic Map GM-35, 1 sheet, scale 1 :48,000. Shumaker Creek may actually lie above the basalt of Sen­ Bentley, R. D.; Campbell, N. P.; Powell, J. E., 1988b, tinel Gap, Frenchman Springs Member, and below the Geologic map of the Poisel Butte 15-minute quadrangle, Roza Member. Washington: Washington Division of Geology and Earth Resources Geologic Map GM-36, 1 sheet, scale 1 :48,000. Grande Ronde Basalt Bentley, R. D.; Campbell, N. P.; Powell, J. E., 1993, N2 Magnetostratigraphic unit-Upper flows of normal mag­ Geologic maps of part of the Yakima fold belt, north­ eastern Yakima County, Washington: Washington Division netic polarity. Includes the informal Sentinel Bluffs, Slack of Geology and Earth Resources Open File Report 93-3, 5 Canyon, Fields Spring, Winter Water, Umtanum, Ortley, sheets, scale 1:31,680, with 13 p. text. and Armstrong Canyon units of Reidel and others (1989). Bingham, J. W.; Grolier, M. J., 1966, The Yakima Basalt and R2 Magnetostratigraphic unit-Upper flows of reversed mag­ Ellensburg Formation of south-central Washington: U.S. netic polarity. Includes the informal Meyer Ridge, Grouse Geological Survey Bulletin 1224-G, 15 p. Creek, Wapshilla Ridge, and Mt. Horrible units of Reidel Bretz, J H.; Smith, H. T. U.; Neff, G. E., 1956, Channeled and others (1989). Scabland of Washington-New data and interpretations: N1 Magnetostratigraphic unit-Lower flows of normal mag­ Geological Society of America Bulletin, v. 67, p. 957- 1049. netic polarity. Includes the informal China Creek and Downey Gulch units of Reidel and others (1989). Burlington Environmental, Inc., 1990, Site characterization report, T-16 Ranch, Lind, Washington. In ECOS Corpora­ R1 Magnetostratigraphic unit-Lower flows of reversed mag­ tion, ECOS Corporation RCRA permit application, Section netic polarity. Includes the informal Center Creek, E-Groundwater monitoring, submitted to Washington Rogersburg, and Buckhorn Springs units of Reidel and Dept. of Ecology July 31, 1990: ECOS Corporation, 3 v., others (1989) and Teepee Butte Member (Reidel and 1 pl. Tolan, 1992). Busacca, A. J., 1991, Loess deposits and soils of the Palouse and vicinity. In Baker, V. R.; Bjornstad, B. N.; and others, REFERENCES CITED Quaternary geology of the Columbia Plateau. In Morrison, R. B., editor, Quaternary nonglacial geology-Conter­ (Unpublished mapping listed here is available for inspec­ minous U.S.: Geological Society of America DNAG Geol­ tion at the Olympia office of the Division of Geology and Earth ogy of North America, v. K-2, p. 216-228. Resources.) Camp, V. E., 1976, Petrochemical stratigraphy and structure of the Columbia River basalt, Lewiston Basin area, ldaho­ Aguirre, Emiliano; Pasini, Giancarlo, 1985, The Pliocene­ Washington: Washington State University Doctor of Pleistocene boundary: Episodes, v. 8, no. 2, p. 116-120. Philosophy thesis, 201 p., 1 pl. Bacon, C. R., 1983, Eruptive history of Mount Mazama and Camp, V. E., 1981, Geologic studies of the Columbia Crater Lake caldera, Cascade Range, U.S.A.: Journal of Plateau-Part II, Upper Miocene basalt distribution, reflect­ Volcanology and Geothermal Research, v. 18, p. 57-115. ing source locations, tectonism, and drainage history in the Baker, V. R.; Bjornstad, B. N.; Busacca, A. J.; Fecht, K. R.; Clearwater embayment, Idaho: Geological Society of Kiver, E. P.; Moody, U. L.; Rigby, J. G.; Stradling, D. F.; America Bulletin, v. 92, no. 9, Part I, p. 669-678. Tallman, A. M., 1991, Quaternary geology of the Colum­ Camp, V. E.; Price, S. M.; Reidel, S. P., 1978, Descriptive bia Plateau. In Morrison, R. B., editor, Quaternary nongla­ summary of the Grande Ronde Basalt type section, Colum­ cial geology-Conterminous U.S.: Geological Society of bia River Basalt Group: Rockwell Hanford Operations America DNAG Geology of North America, v. K-2, p. RHO-BWI-LD-15, 26 p. 215-250. Campbell, N. P., 1978a, Yakima Valley College: unpublished Baker, V. R.; Bunker, R. C., 1985, Cataclysmic late Pleis­ reconnaissance surficial geologic maps of all the 7 .5- tocene flooding from glacial Lake Missoula-A review: minute quadrangles in the Badger Gap, Boylston, and Quaternary Science Reviews, v. 4, p. 1-41. Black Rock Springs 15-minute quadrangles, Kittitas and Baksi, A. K., 1989, Reevaluation of the timing and duration Yakima Counties, Washington, 12 sheets, scale 1 :24,000. of extrusion of the Imnaha, Picture Gorge, and Grande Campbell, N. P., 1978b, Yakima Valley College: unpublished Ronde Basalts, Columbia River Basalt Group. In Reidel, S. reconnaissance surficial geologic maps of all the 7.5- P.; Hooper, P. R., editors, Volcanism and tectonism in the minute quadrangles in the east half of the Washington Columbia River flood-basalt province: Geological Society portion of the Goldendale 1:100,000 quadrangle, Klickitat of America Special Paper 239, p. 105-111. County, 11 sheets, scale 1:24,000. 16 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

Campbell, N. P., 1978c, Yakima Valley College: unpublished Geomatrix Consultants, Inc., 1990, Seismotectonic evalua­ reconnaissance surficial geologic maps of all the 7 .5- tion, Walla Walla section of the Columbia Plateau geomor­ minute quadrangles in the Washington portion of the Her­ phic province; Final report: Geomatrix Consultants, Inc. miston l: 100,000 quadrangle, Klickitat County, 11 sheets, [under contract to] U.S. Bureau of Reclamation, 1 v., 6 pl. scale 1 :24,000. Gillespie, B. A.; Hooper, P. R., 1991, Washington State Campbell, N. P., 1988, Structural geology along the University: unpublished geologic maps and explanatory northwestern Columbia River basalt margin, Washington: text for the Pomeroy and Rose Springs 7. 5-minute quad­ Washington Division of Geology and Earth Resources Open rangles, Columbia and Garfield Counties, Washington, 10 File Report 88-5, 108 p., 8 pl. p., 2 sheets, scale 1:24,000. Campbell, N. P.; Lillie, J. T.; Webster, G. D., 1979, Surficial Goff, F. E., 1981, Preliminary geology of eastern Umtanum geologic map of the Walla Walla quadrangle, Washington: Ridge, south-central Washington: Rockwell Hanford Opera­ Washington Division of Geology and Earth Resources Open tions RHO-BWI-C-21, 99 p., 2 pl., scale 1:24,000. File Report 79-13, 1 sheet, scale 1:250,000. Golder Associates, Inc., 1992, Draft geohydrological assess­ Campbell, N. P.; Reidel, S. P., 1991, Geologic guide for State ment report for proposed municipal solid waste landfill and Routes 240 and 243 in south-central Washington: recycling center, Washtucna, Adams County, Washington: Washington Geology, v. 19, no. 3, p. 3-17. Golder Associates, Inc. [under contract to] Waste Manage­ Carson, R. J.; Pogue, K. R., 1996, Flood basalts and glacier ment of Washington, 1 v. floods-Roadside geology of parts of Walla Walla, Franklin, Griggs, A. B., 1966, Reconnaissance geologic map of the and Columbia Counties, Washington: Washington Division west half of the Spokane quadrangle, Washington and of Geology and Earth Resources Information Circular 90, Idaho: U.S. Geological Survey Miscellaneous Geologic In­ 47 p. vestigations Series Map 1-464, 1 sheet, scale 1: 125,000. Carson, R. J.; Tolan, T. L.; Reidel, S. P., 1987, Geology of Griggs, A. B., 1973, Geologic map of the Spokane quad­ the Vantage area, south-central Washington-An introduc­ rangle, Washington, Idaho, and Montana: U.S. Geological tion to the Miocene flood basalts, Yakima Fold Belt, and Survey Miscellaneous Geologic Investigations Series Map the Channeled Scabland. In Hill, M. L., editor, Cordilleran 1-768, 1 sheet, scale 1:250,000. Section of the Geological Society of America: Geological Griggs, A. B., 1976, The Columbia River Basalt Group in the Society of America DNAG Centennial Field Guide 1, p. Spokane quadrangle, Washington, Idaho, and Montana: 357-362. U.S. Geological Survey Bulletin 1413, 39 p., 1 plate, scale Choiniere, S. R.; Swanson, D. A., 1979, Magnetostratigraphy 1 :250,000. and correlation of Miocene basalts of the northern Oregon Grolier, M. ,l.; Bingham, J. W., 1965, Geologic map of parts coast and Columbia Plateau, southeast Washington: of Grant, Adams, and Franklin Counties, Washington: U.S. American Journal of Science, v. 279, no. 7, p. 755-777. Geological Survey Open-File Report, 7 sheets, scale Culver, H. E., 1936, The geology of Washington; Part !­ 1:62,500. General features of Washington geology (to accompany the Grolier, M. J.; Bingham, J. W., 1971, Geologic map and preliminary geology map, 1936): Washington Division of sections of parts of Grant, Adams, and Franklin Counties, Geology Bulletin 32, 70 p. [Note: Part II was not publish­ Washington: U.S. Geological Survey Miscellaneous ed.] Geologic Investigations Series Map 1-589, 6 sheets, scale Fecht, K. R., 1978, Geology of Gable Mountain-Gable Butte 1:62,500. area: Rockwell Hanford Operations RHO-BWI-LD-5, 57 Grolier, M. J.; Bingham, J. W., 1978, Geology of parts of p., 4 pl., scale 1:24,000. Grant, Adams, and Franklin Counties, east-central Fecht, K. R.; Reidel, S. P.; Tallman, A. M., 1985, Washington: Washington Division of Geology and Earth Paleodrainage of the Columbia River on the Columbia Resources Bulletin 71, 91 p. Plateau of Washington State-A summary: Rockwell Han­ Gulick, C. W., compiler, 1990a, Geologic map of the Moses ford Operations RHO-BW-SA-318 P, 55 p. Lake 1: 100,000 quadrangle, Washington: Washington Fecht, K. R.; Reidel, S. P.; Tallman, A. M., 1987, Division of Geology and Earth Resources Open File Report Paleodrainage of the Columbia River system on the Colum­ 90-1, 9 p., 1 pl. bia Plateau of Washington State-A summary. In Schuster, Gulick, C. W., compiler, 1990b, Geologic map of the Ritzville J. E., editor, Selected papers on the geology of 1:100,000 quadrangle, Washington: Washington Division Washington: Washington Division of Geology and Earth of Geology and Earth Resources Open File Report 90-2, Resources Bulletin 77, p. 219-248. 7 p., 1 pl. Flint, R. F., 1938, Origin of the Cheney-Palouse scabland Gulick, C. W., compiler, 1994a, Geologic map of the Connell tract, Washington: Geological Society of America Bulletin, 1: 100,000 quadrangle, Washington: Washington Division v. 49, no. 3, p. 493-499. of Geology and Earth Resources Open File Report 94-14, Foley, L. L., 1982, Quaternary chronology of the Palouse 18 p., 1 pl. loess near Washtucna, eastern Washington: Western Gulick, C. W., compiler, 1994b, Geologic map of the Pullman Washington University Master of Science thesis, 137 p. 1: 100,000 quadrangle, Washington-Idaho: Washington Foundation Sciences, Inc., 1980, Geologic reconnaissance of Division of Geology and Earth Resources Open File Report parts of the Walla Walla and Pullman, Washington, and 94-6, 22 p., 1 pl. Pendleton, Oregon 1 degree by 2 degree AMS quad­ Gustafson, E. P., 1978, The vertebrate fauna of the Pliocene rangles: U.S. Army Corps of Engineers [Seattle, Ringold Formation, south-central Washington: University Washington], 83 p., 3 pl., scale 1:125,000. of Oregon Museum of Natural History Bulletin 23, 62 p. Gard, L. M., Jr.; Waldron, H. H., 1954, Geology of the Hagood, M. C., 1985, Structure and evolution of the Horse Starbuck quadrangle, Washington: U.S. Geological Survey Heaven Hills in south-central Washington: Portland State Geologic Quadrangle Map GQ-38, 1 sheet, scale University Master of Science thesis, 201 p., 1 pl. 1:62,500. REFERENCES CITED 1 7

Hagood, M. C., 1986a, Structure and evolution of the Horse Hooper, P. R.; Webster, G. D., 1982, Geology of the Heaven Hills in south-central Washington: Rockwell Han­ Pullman, Moscow West, Colton, and Uniontown 7 .5- ford Operations RHO-BW-SA-344 P, 99 p., 5 appendices, minute quadrangles, Washington and Idaho: Washington 1 pl. Division of Geology and Earth Resources Geologic Map Hagood, M. C., 1986b, Westinghouse Hanford Co.: un­ GM-26, 1 sheet, scale 1:62,500. published geologic maps of the Mabton East, Prosser, Hooper, P.R.; Webster, G.D.; Camp, V. E., 1985, Geologic Whitstran, Whitstran NE, Webber Canyon, and S. 1/2 map of the Clarkston 15-minute quadrangle, Washington Corral Canyon 7 .5-minute quadrangles, 6 sheets, scale and Idaho: Washington Division of Geology and Earth 1:24,000. Resources Geologic Map GM-31, 11 p., 1 pl., scale Hamilton, Warren, 1963, Metamorphism in the Riggins 1 :48,000. region, western Idaho: U.S. Geological Survey Professional Huntting, M. T.; Bennett, W. A. G.; Livingston, V. E., Jr.; Paper 436, 95 p., 3 pl. Moen, W. S., 1961, Geologic map of Washington: Hammatt, H. H.; Blinman, Eric, drafter, 1976 [1977], Late Washington Division of Mines and Geology Geologic Map, Quaternary geology of the lower Granite Reservoir area, 2 sheets, scale 1:500,000. lower Snake River, Washington: Geological Society of Kittleman, L. R., 1973, Mineralogy, correlation, and grain­ America Map and Chart Series MC-18, 1 sheet, scale size distributions of Mazama tephra and other postglacial 1:24,000. pyroclastic layers, Pacific Northwest: Geological Society of Hanson, L. G.; Kiver, E. P.; Rigby, J. G.; Stradling, D. F., America Bulletin, v. 84, no. 9, p. 2957-2980. 1979, Surficial geologic map of the Ritzville quad, Kiver, E. P.; Rigby, J. G.; Stradling, D. F., 1979, Surficial Washington: Washington Division of Geology and Earth geologic map of the Spokane quadrangle, Washington: Resources Open File Report 79-10, 1 sheet, scale Washington Division of Geology and Earth Resources Open 1:250,000. File Report 79-11, 1 sheet, scale 1 :250,000. Harrison, J. E.; Campbell, A. B., 1963, Correlations and Lindsey, K. A., 1991, Revised stratigraphy for the Ringold problems in Belt Series stratigraphy, northern Idaho and Formation, Hanford site, south-central Washington: Wes­ western Montana: Geological Society of America Bulletin, tinghouse Hanford Company WHC-SD-EN-EE-004, 12 p. v. 74, no. 12, p. 1413-1428. Machette, M. N., 1985, Calcic soils of the southwestern Harrison, J.E.; Peterman, Z. E., 1982, North American Com­ United States. In Weide, D. L.; Faber, M. L., editors, Soils mission on Stratigraphic Nomenclature, Report 9-Adop­ and Quaternary geology of the southwestern United States: tion of geochronometric units for divisions of Precambrian Geological Society of America Special Paper 203, p. 1-21. time: American Association of Petroleum Geologists Bul­ Mack, R. N., Rutter, N. W.; Valastro, S., 1983, Holocene letin, v. 66, no. 6, p. 801-804. regional history of the Kootenai River valley, Montana: Hays, W. H.; Schuster, R. L., 1983, Evidence of tectonic Quaternary Research, v. 20, no. 2, p. 177-193. stability along the middle Columbia River, Washington, in Malde, H. E., 1968, The catastrophic late Pleistocene Bon­ Quaternary time: U.S. Geological Survey Open-File Report neville Flood in the Snake River Plain, Idaho: U.S. Geologi­ 83-365, 8 p., 1 pl., scale 1:100,000. cal Survey Professional Paper 596, 52 p. Hays, W. H.; Schuster, R. L., 1987, Maps showing ground­ Marshall, A. G., 1971, An alluvial chronology of the lower failure hazards in the Columbia River valley between Palouse River canyon and its relation to local archaeologi­ Richland and Priest Rapids Dam, south-central cal sites: Washington State University Master of Arts Washington: U.S. Geological Survey Miscellaneous Inves­ thesis, 73 p., 1 pl. tigations Series Map 1-1699, 2 sheets, scale 1:100,000. Martin, B. S., 1989, The Roza Member, Columbia River Hoffman, M. G., 1932, The geology of the Bald Butte Ridge, Basalt Group; Chemical stratigraphy and flow distribution. Washington: Journal of Geology, v. 40, p. 634-650. In Reidel, S. P.; Hooper, P. R., editors, Volcanism and Hooper, P. R., 1986, Washington State University: un­ tectonism in the Columbia River flood-basalt province: published geologic map and explanatory text for the Stem­ Geological Society of America Special Paper 239, p. 85- ber Creek 7 .5-minute quadrangle, Asotin and Garfield 104. Counties, Washington, 15 p., 1 sheet, scale 1 :48,000. McDonald, E. V.; Busacca, A. J., 1989, Record of pre-late Hooper, P. R., 1991, Washington State University: un­ Wisconsin floods and of late Wisconsin flood features in published geologic maps and explanatory text for the Al­ the Cheney-Palouse scabland-Trip C. In Joseph, N. L.; pow a Ridge, Peola, and Potter Hill 7.5-minute and others, editors, Geologic guidebook for Washington quadrangles, Asotin and Garfield Counties, Washington, and adjacent areas: Washington Division of Geology and 10 p., 3 sheets, scale 1:24,000. Earth Resources Information Circular 86, p. 337-346. Hooper, P. R.; Kleck, W. D.; Knowles, C. R.; Reidel, S. P.; McKee, E. H.; Swanson, D. A.; Wright, T. L., 1977, Duration Thiessen, R. L., 1984, lmnaha Basalt, Columbia River and volume of Columbia River basalt volcanism, Basalt Group: Journal of Petrology, v. 25, part 2, p. 473- Washington, Oregon, and Idaho [abstract]: Geological 500. Society of America Abstracts with Programs, v. 9, no. 4, Hooper, P. R.; Knowles, C. R.; Watkins, N. D., 1979, Mag­ p. 463-464. netostratigraphy of the lmnaha and Grande Ronde basalts Mehringer, P. J., Jr.; Sheppard, J.C.; Foit, F. F., Jr., 1984, in the southeast part of the Columbia Plateau: American The age of Glacier Peak tephra in west-central Montana: Journal of Science, v. 279, no. 7, p. 737-754. Quaternary Research, v. 21, no. 2, p. 36-41. Hooper, P. R.; Rosenberg, P. E., 1970, The petrology of Merriam, J.C.; Buwalda, J.P., 1917, Age of strata referred Granite Point, southeastern Washington: Northwest to the Ellensburg Formation in the White Bluffs of the Science, v. 44, no. 2, p. 131-142. Columbia River: University of California Publications, Bul­ letin of the Department of Geology, v. 10, no. 15, p. 255-266. 18 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

Montanari, Alessandro; Drake, Robert; Bice, D. M.; Alvarez, Reidel, S. P.; Scott, G. R.; Bazard, D.R.; Cross, R. W.; Dick, Walter; Curtis, G. H.; Turrin, B. D.; DePaolo, D. J., 1985, Brian, 1984, Post-12 million year clockwise rotation in the Radiometric time scale for the upper Eocene and central Columbia Plateau, Washington: Tectonics, v. 3, no. Oligocene based on K/Ar and Rb/Sr dating of volcanic 2, p. 251-273. biotites from the pelagic sequence of Gubbio, Italy: Geol­ Reidel, S. P.; Tolan, T. L., 1991, Washington State Univer­ ogy, v. 13, no. 9, p. 596-599. sity, and consulting geologist, Kennewick, WA, respective­ Morrison, R. F., 1964, Upper Jurassic mudstone unit named ly: unpublished geologic map of the western Saddle in Snake River Canyon, Oregon-Idaho boundary: Mountains area, Kittitas County, Washington, 1 sheet, Northwest Science, v. 38, no. 3, p. 83-87. scale 1:100,000. Mullineaux, D. R.; Wilcox, R. E.; Ebaugh, W. F.; Fryxell, Reidel, S. P.; Tolan, T. L., 1992, Eruption and emplacement Roald; Rubin, Meyer, 1978, Age of the last major scabland of flood basalt-An example from the large-volume Teepee flood of the Columbia Plateau in eastern Washington: Butte Member, Columbia River Basalt Group: Geological Quaternary Research, v. 10, no. 2, p. 171-180. Society of America Bulletin, v. 104, no. 12, p. 1650-1671. Myers, C. W., 1973, Yakima Basalt flows near Vantage, and Reidel, S. P.; Tolan, T. L.; Hooper, P. R.; Beeson, M. H.; from core holes in the Pasco Basin, Washington: University Fecht, K. R.; Bentley, R. D.; Anderson, James Lee, 1989, of California at Santa Cruz Doctor of Philosophy thesis, The Grande Ronde Basalt, Columbia River Basalt Group; 147 p. Stratigraphic descriptions and correlations in Washington, Myers, C. W.; Price, S. M.; and others, 1979, Geologic Oregon, and Idaho. In Reidel, S. P.; Hooper, P. R., studies of the Columbia Plateau-A status report: Rockwell editors, Volcanism and tectonism in the Columbia River Hanford Operations RHO-BWI-ST-4, 541 p., 53 pl., scales flood-basalt province: Geological Society of America Spe­ 1:62,500 and 1:250,000. cial Paper 239, p. 21-53. Newcomb, R. C.; Strand, J. R.; Frank, F. J., 1972, Geology Rietman, J. D., 1966, Rem anent magnetization of the late and ground-water characteristics of the Hanford Reserva­ Yakima Basalt, Washington State: Stanford University Doc­ tion of the U.S. Atomic Energy Commission, Washington: tor of Philosophy thesis, 87 p. U.S. Geological Survey Professional Paper 717, 78 p., Rigby, J. G.; Othberg, K. L.; Campbell, N. P.; Hanson, L. G.; 3 pl. Kiver, E. P.; Stradling, D. F.; Webster, G. D., 1979, Packer, D. R.; Johnston, J. M., 1979, A preliminary inves­ Reconnaissance surficial geologic mapping of the late tigation of the magnetostratigraphy of the Ringold Forma­ Cenozoic sediments of the Columbia Basin, Washington: tion: Rockwell Hanford Operations RHO-BWI-C-42; Washington Division of Geology and Earth Resources Open Woodward-Clyde Consultants, 60 p. File Report 79-3, 94 p., 7 pl. Price, E. H., 1982, Structural geometry, strain distribution, Ringe, L. D., 1970, Sub-loess basalt topography in the and mechanical evolution of eastern Umtanum Ridge and Palouse Hills, southeastern Washington: Geological Society a comparison with other selected localities within Yakima of America Bulletin, v. 81, no. 10, p. 3049-3059. fold structures, south-central Washington: Rockwell Han­ Ross, M. E., 1978, Stratigraphy, structure, and petrology of ford Operations RHO-BWI-SA-138; Washington State Columbia River basalt in a portion of the Grande Ronde University Doctor of Philosophy thesis, 199 p., 6 pl. River-Blue Mountains area of Oregon and Washington: Reidel, S. P., 1983, Stratigraphy and petrogenesis of the University of Idaho Doctor of Philosophy thesis, 407 p., 1 Grande Ronde Basalt from the deep canyon country of pl. Washington, Oregon, and Idaho: Geological Society of Ross, M. E., 1989, Stratigraphic relationships of subaerial, America Bulletin, v. 94, no. 4, p. 519-542. invasive, and intracanyon flows of Saddle Mountains Basalt Reidel, S. P., 1988, Geologic map of the Saddle Mountains, in the Troy basin, Oregon and Washington. In Reidel, S. south-central Washington: Washington Division of Geology P.; Hooper, P.R., editors, Volcanism and tectonism in the and Earth Resources Geologic Map GM-38, 5 pl., scale Columbia River flood-basalt province: Geological Society 1 :48, 000, with 28 p. text. of America Special Paper 239, p. 131-142. Reidel, S. P.; Fecht, K. R., 1981, Wanapum and Saddle Russell, I. C., 1900, A preliminary paper on the geology of Mountains Basalts of the Cold Creek syncline area. In the Cascade Mountains in northern Washington: U.S. Myers, C. W.; Price, S. M., editors, Subsurface geology of Geological Survey, 20th Annual Report, pt. 2, p. 83-210. the Cold Creek syncline: Rockwell Hanford Operations Salvador, Amos, 1985, Chronostratigraphic and RHO-BWI-ST-14, p. 3-1-3-45. geochronometric scales in COSUNA stratigraphic correla­ Reidel, S. P.; Fecht, K. R., 1987, The Huntzinger flow­ tion charts of the United States: American Association of Evidence of surface mixing of the Columbia River basalt Petroleum Geologists Bulletin, v. 69, no. 2, p. 181-189. and its petrogenetic implications: Geological Society of Savage, C. N., 1973, A geological field trip in Benewah and America Bulletin, v. 98, no. 6, p. 664-677. Whitman Counties, Idaho and Washington, respectively. In Reidel, S. P.; Fecht, K. R., 1994a, Geologic map of the Priest Bishop, D. T.; Powell, J. D., compilers, Belt Symposium Rapids 1: 100,000 quadrangle, Washington: Washington 1973: University of Idaho-Idaho Bureau of Mines and Division of Geology and Earth Resources Open File Report Geology, v. 1, p. 253-320. 94-13, 22 p., 1 plate. Schmincke, H., 196 7, Stratigraphy and petrography of four Reidel, S. P.; Fecht, K. R., 1994b, Geologic map of the upper Yakima Basalt flows in south-central Washington: Richland 1:100,000 quadrangle, Washington: Washington Geological Society of America Bulletin, v. 78, no. 11, p. Division of Geology and Earth Resources Open File Report 1385-1422. 94-8, 21 p., 1 plate. Schuster, J.E., compiler, 1993, Geologic map of the Clark­ Reidel, S. P.; Hooper, P. R.; Webster, G. D.; Camp, V. E., ston 1: 100,000 quadrangle, Washington-Idaho, and the 1992, Geologic map of southeastern Asotin County, Washington portion of the Orofino l: 100,000 quadrangle: Washington: Washington Division of Geology and Earth Washington Division of Geology and Earth Resources Open Resources Geologic Map GM-40, 1 sheet, scale 1 :48,000, File Report 93-4, 43 p., 1 pl. with 22 p. text. REFERENCES CITED 19

Schuster, J. E., compiler, 1994a, Geologic map of the east Swanson, D. A.; Helz, R. T., 1979, Bedrock geologic map of half of the Toppenish 1: 100,000 quadrangle, Washington: the vent system for the Ice Harbor Member of the Saddle Washington Division of Geology and Earth Resources Open Mountains Basalt, Ice Harbor Dam-Basin City area, File Report 94-10, 15 p., 1 pl. southeast Washington: U.S. Geological Survey Open-File Schuster, J. E., compiler, 1994b, Geologic maps of the east Report 79-292, 8 sheets, scale 1 :24,000. half of the Washington portion of the Goldendale Swanson, D. A.; Wright, T. L., 1983, Geologic map of the 1:100,000 quadrangle and the Washington portion of the Wenaha Tucannon Wilderness, Washington and Oregon: Hermiston 1: 100,000 quadrangle: Washington Division of U.S. Geological Survey Miscellaneous Field Studies Map Geology and Earth Resources Open File Report 94-9, 17 MF-1536, 1 sheet, scale 1:48,000. p., 1 pl. Swanson, D. A.; Wright, T. L.; Camp, V. E.; Gardner, J. N.; Schuster, J. E., compiler, 1994c, Geologic map of the east Helz, R. T.; Price, S. M.; Reidel, S. P.; Ross, M. E., 1980, half of the Yakima 1:100,000 quadrangle, Washington: Reconnaissance geologic map of the Columbia River Basalt Washington Division of Geology and Earth Resources Open Group, Pullman and Walla Walla quadrangles, southeast File Report 94-12, 19 p., 1 pl. Washington and adjacent Idaho: U.S. Geological Survey Schuster, J. E., compiler, 1994d, Geologic map of the Walla Miscellaneous Geologic Investigations Map 1-1139, 2 Walla 1: 100,000 quadrangle, Washington: Washington sheets, scale 1:250,000. Division of Geology and Earth Resources Open File Report Swanson, D. A.; Wright, T. L.; Camp, V. E.; Gardner, J. N.; 94-3, 18 p., 1 pl. Helz, R. T.; Price, S. A.; Ross, M. E., 1977, Reconnais­ Scott, W. E.; Pierce, K. L.; Bradbury, J. P.; Forester, R. M., sance geologic map of the Columbia River Basalt Group, 1982, Revised Quaternary stratigraphy and chronology in Pullman and Walla Walla quadrangles, southeast the American Falls area, southeastern Idaho. In Bonnichsen, Washington and adjacent Idaho: U.S. Geological Survey Bill; Breckenridge, R. M., editors, Cenozoic Geology of Open-File Report 77-100, 10 p., 2 pl., scale 1:250,000. Idaho: Idaho Bureau of Mines and Geology Bulletin 26, p. Swanson, D. A.; Wright, T. L.; Hooper, P. R.; Bentley, R. 581-595. D., 1979b, Revisions in stratigraphic nomenclature of the Scott, W. E.; Shroba, R. R., 1980, Stratigraphic significance Columbia River Basalt Group: U.S. Geological Survey Bul­ and variability of soils buried by deposits of the last cycle letin 1457-G, 59 p., 1 pl. of Lake Bonneville [abstract]: Geological Society of Swanson, E. C., 1984, Bonneville flood deposits along the America Abstracts with Programs, v. 12, no. 6, p. 304. Snake River near Lewiston, Idaho: Washington State Shannon & Wilson, Inc., 1977, Geologic evaluations of struc­ University Master of Science thesis, 74 p. tures in the Columbia Plateau. Subappendix 2R H of Tabor, R. W.; Waitt, R. B.; Frizzell, V. A., Jr.; Swanson, D. Washington Public Power Supply System, WPPSS nuclear A.; Byerly, G. R.; Bentley, R. D., 1982, Geologic map of project no. I-Preliminary safety analysis report: the Wenatchee 1:100,000 quadrangle, central Washington Public Power Supply System Docket no. 50- Washington: U. S. Geological Survey Miscellaneous Inves­ 460, Preliminary safety analysis report, Amendment 23, v. tigations Series Map 1-1311, 26 p., 1 pl. 28, Appendix 2R, Subappendix 2R H. Tolan, T. L.; Reidel, S. P., compilers, 1989, Structure map Shedd, Solon, 1903, The building and ornamental stones of of a portion of the Columbia River flood-basalt province. Washington: Washington Geological Survey Annual Report In Reidel, S. P.; Hooper, P. R., editors, Volcanism and 1902, pt. 1, p. 1-163. tectonism in the Columbia River flood-basalt province: Smith, D. R., 1980, The mineralogy and phase chemistry of Geological Society of America Special Paper 239, plate, silicic tephras: Rice University Master of Arts thesis, 161 p. scale 1:580,000. Smith, G. A., 1988, Neogene synvolcanic and syntectonic Tolan, T. L.; Reidel, S. P.; Beeson, M. H.; Anderson, James sedimentation in central Washington: Geological Society of Lee; Fecht, K. R.; Swanson, D. A., 1989, Revisions to the America Bulletin, v. 100, no. 9, p. 1479-1492. estimates of the areal extent and volume of the Columbia Stoffel, K. L, 1984, Geology of the Grande Ronde lignite River Basalt Group. In Reidel, S. P.; Hooper, P. R., field, Asotin County, Washington: Washington Division of editors, Volcanism and tectonism in the Columbia River Geology and Earth Resources Report of Investigations 27, flood-basalt province: Geological Society of America Spe­ 79 p., 1 pl., scale 1:48,000. cial Paper 239, p. 1-20. Stoffel, K. L.; Joseph, N. L.; Waggoner, S. Z.; Gulick, C. W.; Treasher, R. C., 1925, Geology of the Pullman quadrangle: Korosec, M.A.; Bunning, 8. 8., 1991, Geologic map of State College of Washington Master of Science thesis, 74 Washington-Northeast quadrant: Washington Division of p., 3 pl. Geology and Earth Resources Geologic Map GM-39, 36 p., Vallier, T. L., 1977, The Permian and Triassic Seven Devils 1 pl., scale 1:250,000, and two accompanying explanatory Group, western Idaho and northeastern Oregon: U.S. sheets, including a bedrock geologic and tectonic map at Geological Survey Bulletin 1437, 58 p. 1:625,000 scale. Vallier, T. L.; Hooper, P.R., 1976, Geologic guide to Hells Stose, G. W., editor, 1936, Preliminary geologic map [of Canyon, Snake River; Geological Society of America Cor­ Washington]: Washington Division of Geology Geologic dilleran Section, 72nd Annual Meeting, Field Guide no. 5: Map, 1 sheet, scale 1 :500,000. [Accompanied by Bulletin Washington State University Department of Geology, 38 p. 32 (Culver, 1936).] Van Alstine, D.R., 1982, Paleomagnetic investigation of pre­ Strand, J. R.; Hough, Jean, 1952, Age of the Ringold Forma­ Missoula gravels, Pasco Basin and vicinity, Washington: tion: Northwest Science, v. 26, no. 4, p. 152-154. Sierra Geophysics, Inc. [Renton, Wash.] SGI-R-82-055, for Golder Associates, 1 v. Swanson, D. A.; Anderson, James Lee; Bentley, R. D.; Byer­ ly, G. R.; Camp, V. E; Gardner, J. N.; Wright, T. L., Waggoner, S. 2., compiler, 1990, Geologic map of the 1979a, Reconnaissance geologic map of the Columbia Rosalia 1:100,000 quadrangle, Washington-Idaho: River Basalt Group in eastern Washington and northern Washington Division of Geology and Earth Resources Open Idaho: U.S. Geological Survey Open-File Report 79-1363, File Report 90-7, 20 p., 1 pl. 26 p., 12 sheets, scale 1:250,000. 20 GEOLOGIC MAP OF WASHINGTON-SOUTHEAST QUADRANT

Waitt, R. B., 1979, Late Cenozoic deposits, landforms, ing the Burr Canyon, Hatton, Kahlotus, Lind, Lind SE, stratigraphy, and tectonism in Kittitas Valley, Washington: Lind SW Lower Monumental, Pizarro, Providence, U.S. Geological Survey Professional Paper 1127, 18 p. Ralston, Sulphur Lake, Washtucna North, and Washtucna Wait!, R. B., 1980, About forty last-glacial Lake Missoula SW (subsequently renamed West of Washtucna) 7 .5-minute jokulhlaups through southern Washington: Journal of Geol­ quadrangles, 13 sheets, scale 1:24,000, and the Benge, ogy, v. 88, no. 6, p. 653-679. Haas (subsequently renamed Ayer) and Starbuck 15-minute quadrangles, 3 sheets, scale 1:62,500. Waldron, H. H.; Gard, L. M., Jr., 1954, Geology of the Hay quadrangle, Washington: U.S. Geological Survey Geologic Webster, G. D., 1978d, Washington State University: un­ Quadrangle Map GQ-48, 1 sheet, scale 1 :62,500. published geologic maps of the 7. 5-minute and 15-minute quadrangles in the Pullman 1: 100,000 quadrangle, includ­ Waldron, H. H.; Gard, L. M., Jr., 1955, Geology of the ing the Albion, Almota, Bishop (subsequently renamed Penawawa quadrangle, Washington: U.S. Geological Sur­ Granite Point), Colfax North, Colfax South, Colton, vey Geologic Quadrangle Map GQ-56, 1 sheet, scale Diamond, Elberton, Ewartsville, Kirby, Moscow West, 1:62,500. Palouse, Pullman, Uniontown, Viola, and Wilcox 7.5- Walsh, T. J.; Korosec, M. A.; Phillips, W. M.; Logan, R. L.; minute quadrangles, 16 sheets, scale 1:24,000, and the Schasse, H. W., 1987, Geologic map of Washington­ Endicott, Hay, La Crosse, and Penawawa 15-minute quad­ Southwest quadrant: Washington Division of Geology and rangles, 4 sheets, scale 1 :62,500. Earth Resources Geologic Map GM-34, 2 sheets, scale Webster, G. D.; Kuhns, M. J. P.; Waggoner, G. L., 1982 1:250,000, with 28 p. text. [1984], Late Cenozoic gravels in Hells Canyon and the Webster, G. D., 1978a, Washington State University: un­ Lewiston basin, Washington and Idaho. In Bonnichsen, published geologic maps of all the 7 .5-minute quadrangles Bill; Breckenridge, R. M., editors, Cenozoic geology of in the Clarkston 1:100,000 quadrangle, 32 sheets, scale Idaho: Idaho Bureau of Mines and Geology Bulletin 26, p. 1:24,000. 669-683. Webster, G. D., 1978b, Washington State University: un­ Webster, G. D.; Nunez, Luis, 1982, Geology of the steptoes published geologic maps of all the 7 .5-minute quadrangles and Palouse Hills of eastern Washington, a roadlog of the in the Walla Walla 1:100,000 quadrangle, except for the area south of Spokane, Washington. In Roberts, Sheila; Levey NE, Rye Grass Coulee, Levey SW, and the part of Fountain David editors, Tobacco Root Geological Society the Levey SE quadrangle located northwest of the Snake 1980 fieid conf~rence guidebook: Tobacco Root Geologi­ River, 29 sheets, scale 1:24,000. cal Society [Spokane, Wash.]. p. 45-57. Webster, G. D., 1978c, Washington State University: un­ published geologic maps of the 7 .5-minute and 15-minute quadrangles in the Connell l: 100,000 quadrangle, includ- WASHI NGTON $TATE DEPARTMENTOr- Natural Resources ""' ••• + 4~ J:nn ife r r.,. Belc hc r (ommi,;ione r of Pub I" land, R "8 E Kal ee n Cottin~ ha m • Supe,v]so, .. , , R '7 E " Geologic Map of Washington- Southeast Quadrant A !2 E .. 111i"30' Washington Division of Geology and Earth ResouTces A 21 E " ""' A 20 E ""' ""' A 01 E ""' AlH Geologic Map GM- 45 H 15" Sheet 1

-,,, .. '"' .-, /-· ·i?'.:/: ' , ' . -· -:i"• _-- :::(i&,{, -~-·:;.._ DESCRIPTIONS OF MAP UNITS ... ., ~ UNCONSOLIDATED SEDIMENTS VOLCANIC ROCKS " Quaternary Sediments M iocene Volcanic Rocks N ongladal Deposits C olumbia m,,e, Basalt Group Dune saml- [ ,} 11 "" medi um Lu licte sum! a mJ ~It . composed af q~eru basal, and/ or ielci sr," ~rcius· c·obri,e a,h. com roonl\' ~lazama lephra. present loc., lly. ,nclied<,s bNh ~"''·'<' nod E<: ensi·, e ,ho'ei:!ic basal, Fl ot',~ of the Co lt>mbia R,,.,, 15.,salt (;roup underl ie olmve t lhe entire ) stabili,c,i dun.:,;_ map a rm In W,"s n,rag tor. , he Cc,lumhio Hi L'<> r Bas,I, C,roup IS compos,>.d of ro.,, k,mia, . ,n,. Hom yoenge.S1 m oldest :he:, ore the 5'oCd le ~lou nto ,ns ll ~solt. lhe \Va,, op;,m lJosa lt . foe Grande Ronde "'• Larn.striM and fluvial dspn~its- 0 ·,,·, si ll , and sMrl ,n interi m dra111e•1c bo,in>. 1,.,solt , o~d the ln,no ha Fl,, ,x, lt, !Ill iour fornuti0ns mop o ut m the ma p urea Formdl ond ;,i fo rmal strohg,aph,c un iTS that ate. cun-,cr,1C1 reco,,nizcd m the Colun1b,o River Boe,lt Group arc ,hown in F1 gme 5 o f ,he pamph!et Alluvium-C!ey. ,i]t sand end ~,e,•al dcpm >.od io s t, eand ,eJ_, ,,, ,d ransa ,-,.nc.J th,ckness aad Each forn,alb n rnnsbts o[ , ,u11 1erous nu.os These' llm,•, crnplc'C frum no,ll,-r.orth"-cst-Lrc'~di n~ >ortin~ ,n clude; terrace and o r, i" n,c depo,;1, i" pJoee., : cu"''"""I\' ;,,d,,,b " " '-'"Iced lo<= . llsi;urc s;•s,cms in sou1heasicm Washington ancl ,,dJ~cc nt Ida ho .,nd Or,gvn ct,mng 1h~ m rl y, " oi,[l,ue,i fl uu-1 J,•po,,L.< (,,, " ' ' 01s, o,gl , 1.\,,.,,,,., k•pJ ,,,,. Ell c,nsb,mJ l'omia ti o r1 lumls Mc,Mc'l) a nd mtddle . en d la:c M, c crna, /ra m about 17 .3 /.1.e ,o about 6 M~ (B,~si 19S9, Tolan ,,nd o thers. 11",~" IJ F""'''" "'" (ocnll s ~'1c. ~M o,] sedin,,,, ,t,, ,>1 v.l rour,Jed to .,n,iular basalt d asls; older l 9S9 : McKee a nd others. 1977. Reidel ,,nd focht. 198'/) slreaa nl,eJ J , p, "'" '"" l'r"'l l,y p,.;logem c c,,rl~nior~, (slo~c.> 1, n IV nf Mochel w l 9 S5) or ,llm'1a; f.m o,,p nsds m pl,"~' o,.·,rloin l•y ,,c.d inter,t, otii;od «·iU1 J,,._,,. a,:d ,lopov:o:h. httk· o, no colic! ,e lncti•.,~m l tloo.• ;hid:nes, ,; QHLt o v.1n"'1 and g~ner..lly ranges f, nm a fe w ,new,; to more ,h:,o d~,eloprnenc in Ian d°''°'"'· fans g~nereUy cone-sha~J " iii, ;;"r""" only 11 ,Weldld y Jis,c, Leci . 1 00 '" TI11 rk,1ess ur ,l, e CL"lu11# , Ri c-.,, Flssa l1 G, oup re,,d,es mc•rc• Ll ,0 11 3 .2 b n LIL lite Pasco Jiisln {Reid,,! ., nrl o1 hP.rs. 1 9S9) Ac·,,r,1gP. lh lckn ess. calcula,e bbli,s oi querl, ilil'. ~,a 11i Lic. 1eelamorphk. a ri :l .:> 11d o rieiu tl l serlucc· a rea {1 63,70 0 kml') ,Jtven ~Y T.:>la1 1a rJJ others 119 89). ' ""Y Ue about l 06 ,,ul, dni,l~,lic r,x-~s. nnm.al tn n,,,,,,a,,,I magnet,c pola,ity W,ei< m ~~ d oth,•,s , 1' 19 l , p . ZJ]J_ 1,m 13.SOO ftl. T 11 ~ In the foJJo,.rng d=:rip•ion, Cct,i b of rnDli ng joints and o:her im,-,1 ~ow structures. ;nte rbcd l -,-- ,'' Mass·wa~ting rl~ r o,;t.;;---1.,,,,~, hci<, and l3lu ,deposL< s com po sod ol clcy , silt, sand . ond m unCed ma Lt•riah . fr d 1 a nd '.'.' c'clll,erc'h1·sical charact, ts1LG . ' . ' ., ' c,mcmed by iron-stai" ed d o." surface rnmmonlc· dissected .1nct capred b-1 a e<•elhlew lupe,J ~'""'""' . . : ' ca l:che la1•m. magnetic 11 0 1.,rify, .,nd ge0<0he m:stry t~ ~s,1qn a fie. "' ca '" Jo,m.1tian .1nd membe r. u,,. ,,olly J r,rellrnln,, ,y ., s.signmcnt is m.>Ge in 11-.e f1e!d .1.-.d r.w, rnnllm.ed {or c.i ll ed ,nta quas1ia1tl lo), Terraced del)osils- !\llc"i" I J e pus,b o/ » Ii. s;rd anJ g,m·el. locally ir.dud~s l,cus1e 1n e. che 11\icol ~, wl;-ses pa'ud,:, L ;;u,d eali a,, d,•po,; 1La: dosLS Q/ Ji..use composil ion, ,Jrd sligblly t,o mod,,rol<"i\' wm Lhered prn,rl 1• i,~iur:,le~. Lll" W" ,1 bo,•e m"llern fbOO plains. Saddl"- M~u~tai11 ,: Basalt- Bli'li,e-~rc1r,ed on cl QIMsy parts, mc-s r ph enoc,~sts cMs;s:,no c,f p l, gicclMe. ,,nd lesser umount, Bonn ev;lle flood deposits- Gro,·el anci eandy qraS<• I becelt d=b ,n,,,·e dbunJ .,,,1 ,1,~" d ,-1 ,. of oli,inc phe"CCC/ 5t5 a nd 01ic,0pJ..onocrys1S; !ol'.'Cl rr.embc>"fS an, molly / - . _ u,...,.,.----- T 1" /'I o f [11 ,1nilic , ocks anj ~""'n,,:b,·- fa cics m b .. iclastic rncl.s. '"" l"i"< l~ pl " " d,sb " r 1>ebhl~ ,u,O magne!Lzed , with two of the "ppcr units mcw,ely ma']n~tteedc fe eder dikes. whc' IO knc,wn ;n cobble SLZc' acid ,nlerheJ,leJ , ;II le,os f tru> ';no k~ Rt-~r momhee) n, in p.,s;~rn and {nr) sn,c: heas;,,m Cl.o~" tnn 1 , 1llll,11 110 ~1J., nr,1nglc illl'n <>i 1h, In,,:., ,f ) m mmnnl;- is h,, mowhs nf mhw,,r; can\'<"''' unde,lias M,ssool,, f!ood der osils (unit Cl, ) memhers) , c.nmm ,,nly 1ndLldc.s i,c,dil!irld sedirr.enl~",' imPrhPrls d the ~ll e nst," rg 1-o,ma ticn I -) , a, (,init Mc) a nd uaOi,;ded f!o,cs invor y inlerbed,. See the pumphbt fo, ecid1tiono l ,·1, "I .' PHi!Jlaeial Deposits desc, lpti.-~ ir.lm ma tio n ,c· Cm,ai•;c, of rl,~ l.o1: lase. <>11'""'"· or. ra rely. a ugl!e, Im,.,., fl oe:; o f no,mol a, «J l~clcs pehrn dlcic I11 '"" ""· I'"'" 9 ,,rn9e. g'"V te n , h~ht brown , rnn . yd!O\c 1,h b, O'A'n, brown. niagne,ic po k,n!y, 11pper ilr.«~ ,eve rsely n,ngnc t,, ed . M d middle itows e>«ursio nal o r tron,ilional; h"rl. '" ,e,ldish ,ell v'<. m,,,,,w · typical ~eomm~h,c expra,;b n is~ comp!e s oi J u,\O s: C ec rl ,l< Ps ,n rh e Ck,, nl~ J encos,,o g ~'·"" , ,,,, ihe Ellc nsbur~ Fm ma t,on (urnL M cl auci undi,•ided ~ow, rn•astoe into scci;mentar,· 1ntcrbed.s See 10 the northeds'· thtckle« a< "'"'ho< 75 ,n n,,.,, St. Jc,hn (lk.sdic 1 ·100.11 00 <1ua,fr ang\ •] O'ld the 1u 11riphle l for ,1dcl ilioa1,l J ~_nipli,•e i11(orrno l1o n l\iik o, IP ullman 1 100.00 0 qued,anqlo) (R,ng~. l 970), 0 1D• p;call1· less 1ha" C,O pe,c~n,, '" Outburst flood deposits. silt ond 'r e !nc,, ILty ,n the can,on oi ,he Gn ,nde Ronde Ricer m,erhedcled ollurnm. col]u c,L1 m. an d ped oq, nic bu, i2<,n, _ ,h!,th,n;,-all,• bec lJeJ ; , ,,,,d-do·rnn.,1"'1 nn-< th o/ the mmuh of ,loser h Creek (secs . 2 1-''3 . r , 7 N, R. 4 6 E.) in ,he Clor~~ton I JOO.O LI O foc [es t;· p ieull1· pl~rc,r laminok.,:l and aid uci os .sprnc,,dic cham~,I 1, 1] ,.,.,I"""'~,. d,;plui;1n g normal g1~ded rh,-1hmil,s;,: magneto< Lr ati ~raphic llrnts. from o lciasl to ,·oung"-st R1. Ni, Re. Ne [,_,,tom R ,s rov~rscd end N Oe pc,,; ,l ed by relaticd 'I :a,.., e nrr~1· , lock wa:ei > of o utb e.,, CooJs fr u,,, gl,ciol L.o l!ari1;1 other ic~ ma, ~in lalo, ,. ma,.imu,n d,,, kne,s ·,s n :Q1e 11,a,, 20 rn iu ,Ill' ,,_mh·cenlrel port of the Pr,es! Rc pid, l 100 000 qu,J,angle " " "~!,,d., I o ,., h1,rsl fl,x>d bar, ,mil is 1Cidely dis1nbu·d in Grnnde Ronrle B.as,dt, ;nv,,sfoe l~o'"' lm,-,;ve into sedim~nbry m•e, bed, of the Ellensburg tl:e eo.·a,U" n po,l ,_ ,f ,ioe "'o~ o w o p,,t;cu l~,1 ,.- i,, e> mk•es a nd ,na10, m·er rnllr.es a t e:~,·a1ions F" n n~t ion and La tah formc;1on [un11 Mc) or unnamed unit.;; OCC U rn•'-' " ~,ai,>«Je ', •.·ooll ,~"' ' " ~ms. le« ,c,,,, L~ nl 10 " eathe,lng than ,,-,•e rl;.in~ Grande B,mkc'r 1985). Tou chet &,cl,; aHd 1:u,I of ,i ~· Hun f,ml /""""" "'' (C, u.~,,, ,rn d m/,e·c,, 1987) l!,m.le fh .-, ·"' o "tcmr s '"" morr• '"luk,•d, c.onnal rn ognclic polarity in the map a, eo esco,p! Im ih

:':\;.. ~ mc.instre,, m b c:e ; ., lso c0n1air,< cLw s of g,inate. quarTa ite. d, orite •:o!con;, pmph>'" e,. unJ "'"'""" " !' h ,c ,o,.;h : 11 ,,, ul>'r~om f,,c,~s " '" ' !Is· J1,!ril• ulc•d dlur,~ the presc~' Qr,d io M lcmner ,_-_;rv/ "~. 1• ,,. co"r.,esai Ilic Cu l," nl,;., , S ri ,,~ <'. , ,11<1Y ,1 l.1rna R1 •K• rs, locall• 1 rnbdcs poorlc· lemine:ed ,,M '~"" " "' INTRUSIVE ROCKS silt .-,~em. cm,posed o f base.11. ,;, ,,,m, and f,,!rlsroa, ,anrl lo 9,0,,01~ Ac.'dic intn,sive rnck,- C, onc:n eroli!I less :h,n 15 rn th,ch, un ,t is v.,ci ,-sp,~,.,J ,,I,,,,~ mo\' re pio, e"t ...t,nds. ebn_qotc fc'J , pc, c,,.,t~la. ""n s!>ee t- l1l< e. sha rp:,, lxiundod. c~~1 w rci,nt. homhler,rl e-he,1iing. ma fic ,cq,e~a L, o"-' '"" 11,at dc fi ,ue a lol,a tio n a,Kl ;,,,purl~ gn cis,k eppca,ence to thP ,eek cut bs• d.Ses a ( i,eg;,,~,,te, "°""ins le!dspathic wgrega1 lirns immed1etd1• .,~~-.re nt ,o ,.lark~reen sl1c1'en:1de~ su,hce,. l:ght·QrO\'; co;:nse-groi,:ecl: lool i"'ed. e,µ ,,scd on bo1h sides of the S11ake R;o.,r ar (.-mnlte Poi nt SEDIMENTARY ROCKS AND DEPOSITS [secs . 13. J4 , 23. ond 2•1. T. 13 N. R. 4:l [ .I in the Pullrn," 1,100 .000 quad,nngl~. foe contact of Ll:e Granile Point bed1ocl< w;, 11 01."<' '1ylng 1,a," 11 ~eru,ral i;< ahsrnred by tolu, iJ loope r ~,,J Quaternary- Pliocene Sedimentary Deposits fl osenhe,~. I 9701. but 11ewe r rnSroad ,·uts c,,.·pooe ., 11 t1 nconformi t,,' at which bs.,lt .,~,· rl :es a thm r,.le,,snl c,n the ~101100, L, d !y , l,mOO lo c hlorltel e<·ill, ""Gsso,~·a pati" '· "" con. and carbon.,,~, ,nequigranula, "''-' "'" · El rn,,u1"il ~. lid,,r<>fl ro compar t ta 1.1·eilkl1• " ,nc nlell: 0$ rr.uch lion order ol hurn b1e,:de-hiome tunalile (l irn). bimiiMonalit<> . aplito dilc.,s. q"a m -<.Ja bl,rn as 25 m thick U1hes. pcgmali!e di!< as, and quartz •:e,ns {ht) [I loffmon 1 932). ,, ·eQk fo l;al iu,n d,1)6 .steeply a nd " e nds arr,rn,ir.ia r< ly m st nr r are!l,•I tc, ,h, rid~e cA Bald Bulle. Quaternary- Miocene Sedimentary Deposits Cretaceous- Jurassic Intrusive Rocks OM, , I Continental sedimentary rncks. cong lomerate- Pcbb!e. rnbbk-. anJ bDulde r grac\' and /U l, METAVOLCANIC ROCKS . ohor. doncd fnd,e Ra1 c,· d ,cin.,el, . ;,, '"°"I l' I"'''" oo~d."n b,, Ihm io Lh,cl. u~n""rs of s!a ck"T,tor ••• \1,»ould noc.l sed"" """ {, mi l ms), c.,fe c.e rl k,>nic rooks, und;v;cled - A, n11l ite ~reen'1one. quartzite , !nc!,,dc., unmmed gr,wd 'l , un1, ,.1mcd _qr,we! 2. w1n,1mecJ g,o,.,/ 1. Chirblu11 ~,m·~/. G q1J art,i1;c rr.N,,s,d1mmtary rnc.l:s , omrh,Mht,c sch;st rh,;llite. mct~nobbro ,,nd pl,Bionran;;, ,n 1he head'" "'"" oi Mono1chee CreeS (T. 7 N. ... ""d ~,!,c•c,; i 19 92}. l R 43 E.1 in the Clarlsstan 1.100 .000 quacira~gle base M l e,cr,csed Pliocene Sedimentary Deposits Pre-Cretaceous Metasedimentary Rocks Continent~[ ,edimenlaro; tocks, eonglomera!e-Coa,se ,and a nd g1 a vel. n,OO ,,,a1e!y tD Qm,rt,ite- Orth~c,uerl:il~ ne~rly pure quarte w,l h m~gneLil e·w reJ goel!o:Lo 810ict>. spars,, hOg hl >• U"ircu, ,. anJ ru lile a nd ra re Lo~m,eLi,,, grains, loca lJ v ;, ,1 s,,xiaLed cdlh Ll w main -01,rn ul th,• \ allim« ){Iver. ''-'" " '"' ruund,d Lo eubWlmded d a>ts u [ indu! e, min co r ..:-hi;[. ,•:l,il~ lo c r~4rn\' ,.I ,ik lighl·gray lu bJuish- a nd purplish-gray. pink a nd ... dmahl" . ;n. le ln inl ,omS<• dial ,• ,·<>lca" ic rnc b c,nrl rncc ,.,, a, l,;~h Hada! 1.,,,-, ,·e, rn:,w irn ls"d "' reJJl,h-hcclC"ll re«V>Ee]l;,~J t<> c<> <"" ~'"" ol,'o,lic l,•xtm,, , ;c•lid cm ~s·l aminafon. mass i<·~ dcep'v as 1O LJ m by smc. 11 creek c·a lL;,s-,;. en~ a side.,t.eam lades tha t ,s , cl,Hmi 10 lnb,,i a,y sl m,,ms h ddm~. Cnc,,n,pirn~"' h<,:ld"'8 pla'"''· dense ao.d rn,,n lo r~ob'e; o cwrs ;n ,he h,gher hill, ------OREOO~--·- ·---- R4,E 117 , R J• £ ".' II'< E ol 1h e l al;a rr.a R"er ar,d I hat cont..ins moslly subac.gula, Gwsl,• 1/ n"~" llas,,11 d,,st, ,,.;a o ,.rn,s (Orne cerbot1 aceu1L< l:.a ci sc u,dcJ.a.s u,_,,_,c, ''=dll, is ,., lh;d , as 1S5 m ln 1:"e deepeS1 pert d ;he Cold Crack S') ndme '" ,he J·lar.ford Sice in the El reef deb1is cs.po:c "I'- l 9 ~ J) The R,nsold Form .c:ia n was (un it Sm~. probcbly un con!o, mabl~, o,,e rla in \C; ,h angular ,u1e0nro" ""Y b>· C,:,~ ,1 Hnlluw 1u 11wJ b•,' Moniom ,nd Buv.•,1 ldo ,,1 9 171 lo, s·nLll m 1ha '.\'h1 •e B!Llf i, o n 1he Pnast RepCds fo,ueol ,uu (uu;, Jmf. Fl 27 E l lU IJ.U Ull quadran~l,·. ·1\ •:u rad -,, "" ' sl1m\"II on llw rn a p: fill er J epcsi ls {un :1 rll,! c) onJ coarse,· CoJ1a,.1ts of the Mornn /lr,dge I .rn1esMne (h'om, ,'/M. l %:;)_ T , ffi: menas. ci,kll~ rnri~l mncr~lc {m>il ~M cal. 119 JO' Metosedhnento,;, a nd meta,·olconic rocks, un diviOed- T l'.'U fo1ma l; on, of Lile S,·vc" Continental sedimentary mcks- lnl~,hedrleci lha<· ,al ~nd lac, a,L ,irn, '""I. ~ II, ac,l cla·,· hc•ds De-., ls Gro up (V.,11,er. l q77I o. i1h lo,~l len,e, and strmge r,,, s.and chicl ls· quart, a nd lelOsra;, lac,,111 m,ceceo""· ,,;nla in, ,,c·,o~, Do.,Je CroJ'-' k fom k1liun- ~l1,ruo 11 .:n0f,>rma\,le «;th ~,.,,t,,ng Mot! in f1nd£e UmMtone {unit fao), the "" be.ldir.~ ac.d cmw bedd,1.~. uppc1mo :t !Ur r.t otion d the ~e;·en Dcd s Group by Unconsolidated Sediments ------7 c~'"''" of r/,a JT.i u foci,,, of 11:e Ringold focmatioa. Wild Sl:eep Creel; Forn1,>lio., - ),k" bas,1ll. 1,ilhv bNrl i. and pillow brc•ccia c•,it h '°"""' , o lcani~ b,ecch, aod vo lcanic son d,t.:.,~ o,·erla;n by ,,rD1 ll1 ,a o,, th,, Dni·l•. Cre•I< r~rmatlno n>as:iw l~ h<>O ct,,i . l,,c,,111• ,mbMca,ed. ,·nmm,,nl,· ur.cemenre~ bm in pi eces rr.cdmate:y to pmiy C.,1,,;,i, ~r ,Jie J./vyl, Creek o1'd ,fa, \ I 'i ld Shwp C,e~k fo,r.,o,k>as (VGl.' ,er 1977). ""' ,ndurntcd ,•i,!h s,lico im n o:,,de. ~ad calcite 1997 CcmsiS! >' ng/um,•cc·Li c J~cie, ,,/ ::,~ Hii,~Q;d FurmoliM . Precambrian Metased imentary Roc ks

Alh 1uh .. n - Peb1,i~ ,o cobO le lan~lom,0 ra:e, subangu!ai ,o a ng,a ler fragmerns o f b~seh ~ ~d M;ssoula 6rnup, Striped Peak form~ti,m-Predo ,ni.i onlly ~ra , . grc·,•n. at1cl red ,ill ile ,,. iLI, Fl FJle n, h, ,, g " d,n:ents iun',ls Mo. MCJ] re r. y,ng 1r, s'z~ /ram co bb:,, Lo medium , and. ind •, des Hurni. ;ul,ordino·e l1 qh1- cdoroct quar!,ila 011d mi,w, µ ink Jo'.,, rnilo l,,ne,, ac,J (vrl L, eJs: Jork arg ill iw SCALE 1:250,000 HOLOCENI, 0., ''·" ""' 1110;; « ,, ;,i11g. ,, ncl l,nd,!,ct~ de pnsu 10.islc• mdc 11 ,,red «·Hh pedogcnic carbnnme, ge r, ~r.,lly µ,rli11'; S , ,.,.,,,.,~ri: J50·m·thkk con,• oi ~ra, l<> rc•dclbh·gra',·. medbm· to rnar,e·yrained /cid· puo,l)J L!l•J J ,,J - '' -' I" -'"" olcu1ll 11\,, north~, n 11,",k u r II , e S ,1d,ll e ~fauntai ns in th e Sm,7n,1 Fl snch sp,,lhi, ~uark:ile cornmonlc prc,enl ~bout 31.10 m bolo"' Irle nd, ,1 n <1 p,,hh'e he.'IS. lnc ol gr/A·d and R ,. E Ravalli Group, Revet! and Burke Fo,mMions, undiuid•d Moslly l1r, ht ~' ay to gmon;,1,. Metasedimentary ,,,bh' e IMs~, . h c,,I rl ,,,rnii, ,,e bect< M d b hors ,n cl•.,da s l,1ee1<,M e ctepn<, t<, inclt,rles hgnM beds B,ise compiled from U.S. Ge~luskol Su«•ey 1,100,0 00,scale tapa~,aphlc quadrangle, da1eJ 1975•1984 g«c, rn,mno .. lv """"'" '"'' _s, lt,•e onJ cc hi!e. c~m,nonly leld,poll1ic qua " 1ulfaceau, and clae.< IIIIHII Projection and 10,000 mele, g,,d. ,one 11. UnJ,•orsal Tr•nss,,cse Meccato, 0 2,.000 50,000 Faet lucal :y be n,o nillc . ,ar,d, gen,·, al'y rnm r,,,C<'d o' q~a,tz and fd:l,pa, with minor mica ar>d. in the c· ,1c e,ous. i<;,;. dl , c,,c,: ainjng m,,,a J ,,d ~'a"" o f Of"'yu~ ldu,~, yea"-'' ocruc; ,n lhe northe,,,t comer 250,000-foo l gr;d tick, baSW on \fashl ng,on coordinate sy>t~m, suulh ,one Cla,ht0c, l JOO 000 quod,~n~!e. ho,nb1e,> J e: sorne sands " c h ,n basolt gra,,i, , raleo,~l, o r !he "'"I' a, e,: 'l•/d:»lec ,,,,J Nu ,-,e, I l 9S2. !' ,J9 ) de,c"bcd ,·0d"' on S L, plce B, ,1 le [L l ~ N ll 44 E.I ,,, r-.dcii, h b,o,c·n. 1,m. ,, ,,J , •. hile , """CC"' le·be" ri"> y~o,lzc (e u f tiw Revrn Form,t1,, n, 1927 N~rlh Am e rican D3n•m """""o" in fo, e-gceiPe,I units, .-l e.st, c~mp.-,,e~ oi h,,-., 11, o_, ,,,,1,il e. rl ,o, ite , and , nlc,,aic pmrh~­ Contour ln1erval 2CO Mete,, th e e> po;ure , -ou1 h of Rosolio a, · Qumtzit€ , schi,: and ~nebs o l the Pricha,d Fo ,,na t1 0,1 '\ mid cie_, i!-'n ,·s1 ll,,pids ,,nd li, cnl,on d I 1\IL) ,(HIO_I qc, ,,d,.mgles]. b;,sali, re d "" d goeen , v!e<, n'cid'c tt.e ,·xJOOSllTC, in '""· 6 , ·1. 19 N.. R 44 E .. part of lhe P,ichc,rd formmion o, [],_ e StripeJ Carto-graph,c design an~ p,oducUon by C·ul F. T Harrls, Ke;th G. Ikerd, and Nancy A. Eberle rock,. q,<~ mil~, s,lirn igneous rock,. end me ~1 rr.orph:c rock, (Clm SS1on und Orohno l . l 00 ,UOO a, Pd, Forma1lon . ho""'"", in ,h,s ,.,port. the rucl-. , a, e shown " ' Re,·~tt-Burk~. uctdit id~ U. ufler o_u,d1·anqlesl. bo:.11 ~nfls';lta. onci pum!ceo·,s r,,ck, 1Goldendole. Hermls:011 . foppe nish . 011d C,lsg, 11973). Yak,ma l.100 0 00 quadrMg!esi . fruR rnantm> µlant fu s,iJ, eo1i,, ,ion ic1 1h€ f'riest Ruµ ,ci, o,id Geologic Map GM-45 11.i, hl,rul l , 100.000 ql!ad, angles gro,·el, form ,rain, and , e1,resen1 a nc~, 1rc,I cum,a, o! Co l•,, nbs, onJ Clm rwc, tc,·- S aLm, ,,, Hee ~.-,; ll "CC hl and 0J1«>. I % 7 ), ":n ,tc- . off cc h,t~. ~n,·. c,a"m· l:9h1-,,~1 Washington Division of Geology and Earth Resources I IOLOCENE/ 1<1w. ,.~,.l'e pl Cn ,,;aJcuL,. ~c11<•r.. lly c•rn QI, ,mJ OP.is) lh• Li mo lw N ili ir1Lt'rl·...d, aHd basalt lh •.s , J, fai,, Echu,t~r. Assist~nt Stace Geol,;:sisl ,md State Geolog,c M~p Project Man,ger PLIOCENE ,n ,he Saddle Mo,, rnain, ila, ,11 inLc"'e<.fs art' prc,c•n t bc t'.1·c rn :norc• ll0w, a r1d are Lhicker than S~hist- C l,idl·, Ei 1u/ 10 ,ndium-,irainad g~,,M -b;,,rn e•1J1u;co,.•i1~-quar!o ,chbt ""d worse­ Geologic Symbols ,n 1he Wanapum or faa ndc Ror,d£ ll asalts · 1r1di\• id1 ~1I intcrberl a ,,s muc h as DO m ,hick in •he srsined ph1• l1H e wilh ,~b~r

t ion oi , ln lU L1r, il Wsi11, il e1•.1,lon . lhrougho~l lhc• unit, ·.•.eathcring sur!ac~s ger.crnll1• r'.,ely broc•.n, quanelle and silt:te commonly Troy. and Po,co be,in, ic co ntact> eo:iiurrnabl£ ce- B Jncludes ul leo,r put! of <· e no a pporcn, rota1ion and arc rnlm!ess 1•·1;h abundant inclusio ns PLIOCENE./ Ro!! konah· Rid!Je .'.km[-.,, Sela .Ii ,\ !.,mbe, .',fcbton m~n,be, (mfu,uml/. Suu,,c u Cn:ack (q u,, m '1): alrhm1gh f,•l1a1i on in the quartzite hcds is no1 we ll de,•e1vp<' edding app&1'S to ha,•e been re~ul.u ;rnd ,xmllrnoo,s: ;he rock has lloo dislirtc1 de~w,gesc o w ns ) concealed ",- ~!IOC F. NF. ,nlc• ,t,,-ri (h elrn o t/,c ;;,,1(,1, Me n,b..rJ, Q,.jncy ,r1 !ecl,,;_,{i /ot"ve d,e Sg<' CT U' C=< i-fornbec/. in the• west half oi sec 14 . T. 20 N .. R. 4 1 E. n<,; ,r Iha no rth ~nu o l Roel< Lu ke in th~ Rosal ia • Bell f!, •LO •CoM lo WE NATC HEE MOSES LAKE RITZV ILLE ROSALIA doltad "+1£re cor.c&lld WCENC: a nd abo,·e rl1e Peles/ Rapid, Member Thrnst fau lt - Sa1J.1eeth o n uppcT pl ale , rlml ed whern concrulOO I f------C,m tiuout«l ,~dim~tlt«r,• r<>cks, c<>TI~ lomer«t~-fb,li•I yr~n·l. cco bOb . ,iii. dfl d '1mJ , S c h~ster Gulick Gulick Waggoner Port Angole,"NORTHWEST QUADRANT ~re-TER TIARY don,irioteJ b\• 'I Oll·r~undeJ 4Qll G•l d o/hers. 19190) a,id the sed,,i,.-,.,s uf L, m~ H,J I I CRET,\CEOVS/ of //~Kl~/ a,i d u diers /J 992). Schuster Reidel and Fee hi Gulick Gulick J URAS5TC El S;,~cl,~e - S ho•.dng direction of plun~e, doltOO "·here concs•aled Eocene Sedimentary Rocks Aberdeen pra-CRETACEOUS . • Olympra _L_ __ Mo nocl, n~ - Am:,cv on ,teeper limb; ctotted wh ere concealed Cuut;«e»tal «Jimenlary ,ocl m .o, ,u,, (,\/o c.iwn. l 9MJ f)E 175. LIBRARY A3 DEPT. OF NATURl'l REOOURCES /13 G.EOi.OGY & EARTli RESOURCES Df\llSKlN. 45 OLYMPIA, WA.. l!a504·7007 copy 1 Sh eet 1 Geologic Map of Washington-Southeast Quadrant Washington Division of Geology and Earth Resources Geologic Map GM- 45 CORRELATION DIAGRAM Sheet 2 (To accompany geologic map, sheet 1)

AGE(M a) A GE (Ma) ERATHEM SYSTEM STAGE SERIES 1200 30' ,,oo 117 0 - 0 ~ I-0 GEOLOGIC UNITS ' I.D 118° + 41° 15, f'~["------;--~;::::J~==:::;~------_:r ______T ______-:; ;:::,-:---.-:------c:;;;,;;;;~ -;:~:--1 ___\:: -:-----~;,s:J'l 41°1s' Holocene a, O;C~H:!_!;M~A~N\-~_,,_!:!!!,gi.--,-~+ ... ~ O'SULLIVAN DAM + "'' "' H ILLS 0.5 - ·~ I-0.5 OF Q. * • ** ~ 1,, METASEDIMENTARY AND METAVOLCANIC -< pre -\11'isconsin COLUMBIA BAS I N - ~ -?-'--'?- I- ROCKS 1.0 ~ . 1.0 Colfax .:~ Greenschist·Grade Metamorphism * * Jl 'r' STEPTOES QE!,;:g "' l 6 - -?- a r.+ c9 -~ - ,r'' 1.6 B Pre-Tertiary me tasedirnentary and metavolcanic rocks •C - • Pull ma n 3 - •u - - 3 _g - * 4 - - 4 B Pre-Cretaceous metasedimentary rocks . .j 0~ Q. \ • 5 - - L.,.._. p - 5 "' • LOWER \\ \. GRANITE DAM ~ Triassic metasedimentary and metavolca nic l'Ocks RM, E!M c g B "' ' * 2 LITTLE GOOSE _,• G Middle Proterozolc me tased imentary rocks BASIN DAM .\ · ··--( ""' ~\ 10 - Meg - 10 \.LOWER M \·s METAMORPHIC ROCKS MONUMENTAL DAM I Mo u 46° 30' - Amphibolite·Grade Metamorphism .. - "' "+ --t Pomeroy + LEI.VIS TO N .,, \ * 0 -c, \\ ' • -c, !p<:hm I P1·ecambrian heteroge.nem1s metamorphic rocks "l-1)_ HJLLS • ~ = :a' - - / - ,·· -...~-•, CliirKston 15 - N •u - M, , - 15 /Cl STR UCTURE ,g <'i< PALOUSE -=--?- T OPPENISH -f 0 M,, M vg INTRUSIVE ROCKS ::.: l "" PALEO SLOPE -1\ :z "'• BAS IN * - ~ - * 8 Cretaceous rocks 11,l I - ft 20 - 20 L EWI ST ON u -" Cretaceous and J urass ic rocks M, E] BAS IN ,B Meg °*t * * ICE HARBOR DAM • .~"' "' iJ--- pT ..•s ~- COLUMBIA BA S I N "' * 25 - ...•- '--?- I-25 LimeM !n fault •C GEOLOGIC SYMBOLS 30 - •u - 30 0 /2 Contad 0 - I- ' ------· · - --- Fault - dotted where concealed + • 119° u _,2• • 40 - I- 40 .. Dip·slip fault - Bar and ball on downthrown side: dotted where concealecl - , < 1 • 0 0 = S3 - •u -c, I- StriK e-slip faul t - Showing relative horizontal N 0 2 mov'3ment : dotted where concealed "' - 0 Thrust fault - Sawl~cth on upper plate: dotted where 50 I-so BEDROCK GEOLOGIC AND TECTONIC MAP - concealed I a~, -2: u.. r.,t,'lu w• R = High angle reverse fault - R on upthrown block 11,l - D I- SCALE 1 :625,000 120° 30' z • 0 10 20 Miles = 2 Anticline - Showing direction of plunge: dotted where •u j 60 - I- concealed ~ 0 60 0 10 20 Kilometers -;;• -E"· Syncline - Showing direction of plunge; dotted where Q. - concealed - = • 65 II, w ., __, I- 65 70 - Maastrichtion Kia K,, I- 70 Monocline - arrow o n steeper limb

Campanian Volcanic vent 80 - r;.:: I- 80 * Santouian Late Con iac ian DiKe - Dotted where concealed - - T uro n ian

1, '\~ '\ Cenom.:t(lic.n "\:-., Fracture 20ne "' \\"'-0- 100 - =0 - 100 •u . KigQ Al bia n ' ~• LIST OF NAMED UNITS - •.. ~ - KJ, V Aptian (To accompany geologic map, sheet 1)

! 20 - Early B1uremlan - 120 DEFINING AND/OR U 00.000 DEFINING AND/OR U 00,000 Lower-case designations of uni t type (member. formation) indicates informal name. 1: 100.000 quadrangle abbreviations GEOLOGIC UNIT SYMBOL REPR ESENTATIV E REFERENCE 01 JADRANGLE/SI GEOLOGIC UNIT SYMBOi REPRESENTATIVE REFERENCE QUADRANGLE(S) pT r.'11 CL, Clarkston; CO. Connell; GO, Goldendale: HE. Hermiston: ML. Moses Lake; OR. Orofino: PR, Pries t Rapid s: PU. Hauterivian Pullman: Rl. Richland: RT. Ritzville: RO. Rosal ia: TO. Toppeni sh: WW. Walla W.:i l!a : WE. Wenatchee: YA. Yakima. - - Distributions of all units of th e Grande Ronde Basalt of the Columbia River Basalt Group are from Reidel and others (l 989) Grouse Creek unit, R2 Grande Reidel and others. 1989 All Rogersbu rg uni t, R1 Grande Ronde Mvg Reide l and others. 1989 CLCO GO HEOR PR PU RI Valanglnlan and include surface and subsurface extent. For all ot her uni ts only the surface extent is listed. Ronde Basalt Basalt TOWW YA Berriasian DEFINING AND/ OR 1: 100.000 Hanford formation Qls, Org Carson and others. 1987: Myers. PR Rl Rosalia , basalt of, Priest Rapids Swanson and others. 1979b n01thern parr of map 140 - ';il"'?,-,- - ?- - 140 GEOLOGIC UN IT SYMBOL REPRESENTATIVE REFERENCE QUADRA.NG LE{S) Price, and others. 1979 Member u Tlthonlan ~ Armstrong Canyon. unit. N2 Reide l and others. 1989 GOHE Huntzinger. basalt of. Asotin Reidel and Fec ht. 1987 PR Rma Member , Wanapum Basalt Swanson and others. 1979b CLCOGO ML OR PR PU Rl RT RO TO 1,N\l,J WE YA .. - Grande Ronde Basalt Member - Late Kimmeridgian southern part of map 0 Asotin Member. Saddle Mounta ins M's Swanson and others. 1979b CL COORPRPUYA Ice Harbor Member, Saddle Swa nso n and other~. 19 79b PR RJWIN Saddle Mountains Basalt. Swanson and others. 1979b - Basalt Mountains Basalt "'· Columbia River Basalt Group N Oxfordian 160 - - 160 Asotin Creek gravel OMcg Hooper and others. 1985 CL Imn aha Basalt. Columbia River Mv; Swanson and others, 1979b CLOR Sand Ho llow. basalt of. Mv,.v Beeson and olhers. 1985 CLCO GO HEMLPR PU RI Callovian Frenchman Springs Member RT TO WE WW YA 0 u EJ Bas alt Group Basin Cit y. basalt of. lee Harbor Swanson and others. 1979b PRRIWW ·- Bathonian Memher Lapwai. basc1lt of. Wil bur Creek Reidel and Fecht. 1987 occurs in Idaho Selah Member. Ellensburg Schmincke. 1967 western part of map - "' ~ r/l "' Middle - Membe.r Formation "' • BaJoc!an Bear Creek flow. Um.:iti lla Member Ross. 1978. 1989 CL 11,l .,-= Latah Formation Griggs. 1976 NE part of map, none shown Sentinel Bluffs unit. N2 Grande Re idel and others, 1989 All except OR Aalcnlan ' Belt Supergroup Harrison and Campbell. 1963: RO "' Ronde Basalt 180 - I: - 180 Griggs. 1973 Le vey interbed . Ellensburg Campbe ll and Reidel. 1991 western part of map Toarcian Formation "' Sentinel Gap, basalt of. Mvw Beeso n and others, 1985 CLCO GO HEMLPR PU RI Frenchman Springs Member RTTOWW YA Beverly Member. Ellensburg Bingham and Grolier. 1966 PR Pliensbachian Fo rmation "' Lewiston Orchards. basalt of. Swanson and others. 1979b CL OR PU - Eflrly - We.is!';enfe ls Ridge Member Seven Devils Group sm, Vall ier, 1977 OR Sinemuri an Bonneville flood deposits Malde. 1968 CO CL OR PU Li m'3 Hill. sediments of Meg Reidel and others, 1992 OR Shumaker CreeK , basalt of, Eckler Swanson and others. 1979b CL H e ttangian Mountain Member - ,,, Buckhorn Spri11gs unit. R1 Grande Reid el and o thers. 1989 CL CO GO HE ML OR 200 - 200 Ronde Basalt PU PR RI RO RTTO Lolo. basnlt of. Priest Rapids Swanson and others. 1979b southern pa rt of map Me mber Si ll usi, basalt of. Umati ll a Member Reide l and Fecht. 1981 CL GO HEOR PRPU RlTO WWYA "'• \W/YA Rhaetian Swanson and others. 1979b CLCOPU Buford Member. Saddle Mountains Swanson and others. 1979b CL Lower Monumental Member, - - Saddle Moun tains Basalt Siil•er Falls. basalt of. Frenchman Beeson and others. 1985 COGOHEPRRITOWWYA Basalt Spri ngs Member Lyo ns Ferry. basalt of, Frenchman Beeson and others. 1985 CLCO HE PU RI WW Late ~ Harrison and Campbell. 1963: Burke Formation. Ravalli Group RO Springs Member Slack Canyon unit, N2 Grande Reide l and others, 1989 All except OR Norian T.t,b Griggs. 1973 220 - u - 220 Ronde Basalt ·;;; - Mabton member. Ellensburg Mc Smith , 1988 western part of map Center Creek unit. R1 Grande Reidel and othms. 1989 All Formation Sl ippery Creek, basalt of. Swanson and others, 197% CL OR "' Karnian Ronde Basalt Weissenfels Ridge Membei -~ Hamilton. 1963 OR - .. >m, - Martin Bridge Lim estone ... China Creek unit. N1 Grande M,g Reidel and others. 1989 All '" Snipes Mountain. conglomerate Meg Swanson and others, 1979a GO HEPR TOYA Ronde Basalt Martindale. basalt of. ke Harbor S1.1.: anson and othe rs , 1979b PRRIWW of. Ellensburg Formation Ladin ian Member Middl~ . Clarkston gravel Meg Webster and others. 1982 CL Sprague LuKe. basalt of. Swanson and others. 1979a RO 240 - - 240 (equiva lent to basa lt of Lewiston Anislan - Meyer Ridge unit , R2 Grande Reidel and oth'3rs. 1989 CLCO OR PU Clarkston Heights gravel QMcg Webster and others. 198 2 CL Ronde Basalt Orchards?) Early Scythic1.n 1: - Clearwater gravel QMcg Webster and others. 1982 CL Missoula Group. Belt Supergroup Harrison and Campbell. 1963; RO Squaw Creek Mem ber. Ell ensburg Swanson and others, 1979b western part of map 250 I- 250 Griggs. 1973 Formation "' Cloverland. basalt of. Weissenfels M's Hooper and others. 198 5 CL OR Striped P'3ak Formation. Missoula Harrison and Campbell, 1963: RO Ridge Member Missoula. glacial lake . deposits Q!s, OJg Bretz and others. 1956: Baker All and Bunker. 1985 Group Griggs. 1973 Co ld Creek interbed. Ellensburg Mc Campbe ll and Reidel. 1991 wesrern part oi map ' Formation Swauk Formation ,,, Russell. 1900; Tabor and WE 570 570 Mt. Horrible unit. R2 Grande Reidel and others. 1989 All except OR RO Ronde Basalt others. 1982 Columbia River Basillt Group Mvs. Ir! vw. Swanson and others. 1979b: All !• r Mv9 ,h!v,9, Tolan and others. 1989 N1 magnetostra!igraphic un it. Swanson and others, 1979b All Teepee Butte l'-fomber. Rt Grande Reidel and others. 1989 All except RO ~ Ms, V\ /VVV' Grande Ronde Basalt Ronde Ba~alt Late z Coon Hollow Formation Jm Morrison. 1964 OR N~ magnetostratigraphi c un it. Swanson and others. 1979b All except OR Ten mile Creek. basalt of. Hooper and others. 1985 CIOR 900 - ~ 900 Grande Ronde Basalt Weissenfels Ridge Mem b1u Do dge. basalt of. Eckler Mountain Swanson and others. 1979b CLOR PUWW Member Ortley unit, N2 Grande Ronde Reidel and others. 1989 All except OR RO Thorp Gravel Waitt. 1979 WEYA Basalt 1000 - ~ 1000 Downe:,• Gulch unit. N1 Grande Reid'31 and others. 1989 CL GO HE OR PU RI \\JIN Touchet 8'3ds o,, Flint. I 938 CO PR RI TO WW YA u Ronde Basalt Pasco gravels a,, Carso n and others. 1987: Myers_ PR RI Price, and others, 1979 Umatilla. basalt of. Umutilla Reidel and Fecht. 1981 CLGOHE ORPR PU RITO .. Doyle Creek Fonnation Vallier. 1977 OR Member "'' \N\J..I YA - I- oTml Palo use Falls . basalt of. Beeson and others. 1985 COPRRI TOWW z 0 '" Eckler Mountain Member. Swanson and others. 1979b CLOR PUWW Frenchman Springs M1a-mber Umatilla Member , Saddle S•.vanson and others. 1979b CLGOHE OR PR PURI TO Wanapum Basalt Moun tains Basalt WWYA N Palouse Formation a, Busacc a, 1991 All 1200 - < I- ; I 1200 Elephant Mountain Member. SLvanson and others. 1979b CLCO GO HE OR.PR RITO Umtanum unit. N2 Grande Ronde R~idd and others. 1989 All except OR .. Saddle Mountains Basalt WWYA Pomona Member. Saddle Swanson and others, 1979b CL COGOHE PR PU RI TO Ba salt 0 Middle y Mountains Basalt WWYA Elephant Mountain floLV. Eleph;:mt SLvanson and olhers. 1979b CL CO GO HE OR PR RI TO Vantage Member. Ellensburg Mc Swanson and others. 1979b weslern part of map - I- Formation = Mountain Mem ber W\NYA Priest Rapids Membe r. Wanapurn MV1•1 Swanson and others, 1979b All =11,l Basa lt = - Ellensburg Formation Irle, Meg Schmincke. 1967: Sw.:inson and GOHE PR PU RJTOWEYA Wah luke. basalt of. Wilbur Creek Reidel and Fecht. 1987 CLCOORPRPU YA I: ·: others. 197%: Smith. 1988 Quincy interbed, Ellensburg Campbell and Reidel . 1991 western part of map Membe r 1400 - .. I-1400 Formation "' River All Esquatzel Member. Saddle M ~'s Swanson and others. 1979b COPR PU RI YA Wanapum Basalt. Columbia Swonson and others, 1979b Basalt Group < 0 = Mountains Basalt R1 magnetostratigraphic unit, Mag Swanson and others, 1979b All Grande Ronde Basalt - M·1g Reidel .ind others, 1989 All u I- Fields Spring un it, N2 Grande M~'g Reidel and others, 1989 CLPU Wapshilla Ridge unit, R2 Grande Ronde Basalt R2 magnetostratigraphi c un it. Swanson and others, 1979b All Rond e Basalt 11,l = Grande Ronde Basalt "', ~ . Ward Gap flow. Elephant Swanson ancl others. 1979b CLCO GO HEOR PR RITO Frenchman Springs Member . M v 1•1 Swanson and others. 1979b; CL CO GO HE MLPR PU RI 1600 - ~ 1600 Wanapum Ba5a lt Beeson and others. 1985 RT TO 'NW WE YA Rattlesnake Ridge Member Schmincke. 1967 weste rn parl of map Mountain Member W\VYA Ell ensburg Formation "' = Weissenfels Ridge Member. Saddle S•.vanson and others. 1979b CLOR PU RO II, Ginkgo. basalt of. Frenchman Beeson cind others. 1985 COGOHEMLPRR! TOWW 2000 - Ra~·a lli Group . Bc.!ll Supmgroup Hani50n and Campbell. 1963: RO Moun tains Basalt Early - 2000 Springs Membe r YA X ~,~ '-~ Griggs. 1973 M ,, Swanson and others. 1979b CL COOR PR PU YA Goose Island. basa lt of. lee Harbor Swanson and others. 1979b PRRIWW Wilbur Creek Member, Saddle Member Revett Formation, Ravalli Group Harrison and Campbell, 1963: RO Mountains Basalt Griggs, 1973 2500 2500 Wild Sheep Creek Fo1·m ation Vallier, 1977 OR The time scale devised for the "Correlation of Stratigraphic Units of North America (COSUNA)" project of Grande Ronde Basalt. Columbia Mv g,Mv1g Swanson and others. 1979b: All the American Association of P€lroleum Geologists (Sal~·ador, 198S) is used in this diagram. Exception's are: P. Mc , River Basalt Group Reidel and oth'3rs. 1989 Ringold Formation Lindse:,•. 1991 COMLPRRIRTWWYA Reidel and others, 1989 GO HERi TO (1) placement of the Eocene-Oligocene boundary at 37.5 Ma (Montenari and others, 1985) and (2) placement Win ter Water unit. N2 Grand'3 QE175 . ARCHEAN !?Meg Ronde Basalt 3000- of the Pl!oc.ine-Ple istocene boundary ilt 1.6 Ma (Aguirre ,md Pasini, 1985). The time sca le for the Protero20ic 3000 Grande Ronde River grave l Qh!C!J Reidel and others. 1992 CL OR A3 is that devised by Harrison and Peterman (1982). Robinette Mountain , basalt of , Swanson and others . 1979b CL Yak im a Basalt Subgroup, M Vs, Mv.,,, Swanson and others. 1979b All M3 Granite Point , granodiorite of 1<1gd Hooper and Rosenberg, 1970 PU Eckler Mountain Member Columbia River Basalt Group M•ig, Mvig 45 copy l Cartographic design and production by Carl F. T. Harris, Keith G. Ikerd, and Nancy A. Eberle Sheet 2 GE 1"11 Y!JIP!A. WA. 905()4-7007