DOCSLIB.ORG

Geology of the Johnson City Quadrangle, Blanco County, Texas

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Geology of the Johnson City Quadrangle, Blanco County, Texas THE U1 II '·1'5 . Y DEPAR.1MENT OF GE AUSTIN 12, TE~ BUREAU OF ECONOMIC GEOLOGY THE UNIVERSITY OF TEXAS AUSTIN 12, TEXAS PETER T. FLAWN, Director ;;;;;;;;;;;;;;; !!!!!!!!!!!!!!! GEOLOGIC QUADRANGLE MAP NO. 25 ID =!!!!!!!!!!!!!!! 0.. 0 ;;;;;;;;;;;;;;; u ~ Ul 0.. - a- <( Geology of the Johnson City Quadrangle, r'- :E -;;;;;;;;;;;;;;; c:Q ..J 0 ~ ru w ru Cl Blanco County, Texas cQ -~ r-'l -;;;;;;;;;;;;;;; ,..,, 111 N ~ r-'l a BY ru Cl =!!!!!!!!!!!!!!! ..,. .... ;;;;;;;;;;;;;;; VIRGIL E. BARNES - 111u - .... - (') - ..,.0 !!!!!!!!!!!!!!! - Cl November 1963 THE UNIVERSITY OF TEXAS TO ACCOMPANY MAP-GEOLOGIC BUREAU OF ECONOMIC GEOLOGY QUADRANGLE MAP NO, 25 GEOLOGY OF THE JOHNSON CITY QUADRANGLE, BLANCO COUNTY, TEXAS VIRGIL E. BARNES CONTENTS Page Page General setting . ... ..... .. ........ ..... .................... .................................. 2 Trinity Group .................................................. ... ........ 6 Shingle Hills Formation .. ............. ................................. 6 Geologic formations ...... ... ................ ............................. ..... ........ 2 Hen sell Sand Member ............ ............. ...... ................. 6 Precambrian rocks ... .. ..... .. .... ...... .. ... ................... ......... .. .. .. ... .. 2 Glen Rose Limestone Member ...... ................... ....... 6 Igneous rocks ..... ........................................................... .......... 2 Fredericksburg Group ....................... .............................. 7 Town Mountain Granite .............................. ..................... 2 Walnut Clay ................................................................ 7 Paleozoic rocks ............................................................................ 2 Comanche Peak Limestone ................. ...................... .... 7 Cambrian System (Middle and Upper Cambrian) .......... 2 Cenozoic rocks .......... ............................................................. 7 Riley Formation ....................................................... 2 Quaternary System ...................... .................................... 7 Hickory Sandstone Member ............ ...................... 2 Recent Series .. ............ ................... ... ............................ ... 7 Cap Mountain Limestone Member ...... ....................... 3 Alluvium .......................................................... 7 Lion Mountain Sandstone Member ............................ 3 Wilberns Formation ...................................... .... ...... ........ 3 Subsurface geology ..................................................... 7 W elge Sandstone Member ... .. ................ ........ ............ .. 3 Mineral resources ....................................... ................. 8 Morgan Creek Limestone Member .. .... .. .................. 3 Construction materials ..................................... .... ................ .. 8 Point Peak Member ............................... ...................... 4 Dimension stone . ......... ...................... 8 San Saba Member .... ............... .... ... .. ......... .. .. ...... .... 4 Crushed stone ....... .................. .............. ... ........................ ... 8 Ordovician System (Lower Ordovician) ............. 5 Sand and gravel ..... ... ................................. ............... ... .. 8 Ellenburger Group .. .......................................... .. ... ....... .. 5 Road material .......... ................................. ............................ 8 Tanyard Formation ......... .. .......... ..... ..................... 5 Lead and zinc . .. ... ................................. .. .. .... ... ......... ... .............. 8 Threadgill Member ................................................ 5 Water ............................................... ........................................ 8 Staendebach Member . ............................................. 5 References ... ....... .... ........ ... ................. ................... ....... ....... .... ......... 9 Gorman Formation ...... .................................................. 6 Honeycut Formation . .................................................... 6 Sample description .............................................. .. .......................... 10 Mesozoic rocks ............. ................... ................... ..................... 6 Winans and Forbes No. 1 Buckner well ..... .................... 10 Cretaceous System (Lower Cretaceous ).......................... .... 6 Stratoray Oil Corporation No. 1 Stribling well ............. 10 2 Bureau of Economic Geology, The University of Texas GENERAL SETI'ING Johnson 'City quadrangle is entirely Russell, Cottonwood, Salter Spring, Tow­ in cited references. This publication on within the Pedernales 'River basin in the head, Flat, Town, and Deer creeks and the Johnson City quadrangle is the first southeastern part of the Llano region. other unnamed drainages. of a series of central Texas geologic Although there are remnants of the Ed­ Johnson City quadrangle is high on quadrangle maps which will be compiled wards Plateau in adjacent quadrangles, the southeastern side of the Llano uplift. as topographic bases become available. within this quadrangle only Buffalo Peak Precambrian, Cambrian, and Ordovician An index map for geologic maps already reaches nearly to the plateau level. rocks crop out in about two-thirds of the published on planimetric bases and The geology of the Johnson City quad­ quadrangle; Cretaceous rocks and some others planned for publication on the rangle is shown on a U:S. Geological Quaternary surficial deposits occupy the new topographic bases is shown with the Survey 7% minute topographic quad­ remainder. Faults related to the Oua­ geologic map. rangle map-contour interval 20 feet, chita structural belt trend mostly in The eastern two-thirds of the Johnson scale 1 :24,000. The relief in the quad­ northeastward-southwestward directions City quadrangle, mapped geologically in rangle is about 610 feet; elevations range ranging from almost north-south to al­ 1942 and '1943 by the writer and L. E. from about 1,050 feet where Pedernales most east-west. Paleozoic rocks mostly Warren, was published as part of a River leaves the quadrangle to slightly dip southeastward at angles up to about planimetric map (Cloud and Barnes, more than 1,660 feet at the top of Buf­ 10 degrees, and the relatively flat-lying 1948, Pl. 3). With the assistance of L. E. falo Peak. Cretaceous rocks dip eastward about 12 Warren and A. R. Palmer, the rest of The quadrangle is drained by Peder­ feet per mile. the area was mapped geologically and a nales River and its tributaries-North Discussions of stratigraphy, structural, gravity survey completed by 1948. Grape, 'Spring, Hickory, Buffalo, Hardin economic, and geophysical problems are GEOLOGIC FORMATIONS PRECAMBRIAN ROCKS terized by gravity minima, this buried PALEOZOIC ROCKS IGNEOUS ROCKS hill may be a phase within the Town CAMBRIAN SYSTEM (MIDDLE AND Town Mountain Granite Mountain Granite rather than Oatman UPPER CAMBRIAN) Town Mountain 'Granite belonging to Creek Granite. Oatman Creek Granite Riley Formation the Grape 'Creek granite mass ('Barnes, in the Llano region occurs in separate Hickory Sandstone Member.-The Dawson, and Parkinson, 1947, p. 45) bodies and in bodies adjacent to Town 'Hickory 'Sandstone crops out in five fault crops out in several places along the Mountain Granite masses but is unknown blocks in the northwestern part of the western edge of the quadrangle and within a Town Mountain Granite mass. Johnson City quadrangle. In thickness along Hickory Creek. The two north­ The grain size of this granite is larger and appearance it resembles the Hickory westernmost outcrops are separated by than normal for Oatman Creek Granite Sandstone described in the White Creek a graben of Hickory Sandstone and some and the granite lacks cataclastic texture, section of Blowout quadrangle (Barnes, of the outcrops to the south are buried a common characteristic of Oatman 1952a) where it is 276 feet thick. Wise hills that perhaps reached as high as the Creek Granite. (MS.) found no measurable section ex­ base of the Cap Mountain Limestone As described by Barnes, Dawson, and posing the entire thickness of the sand­ before the Cap Mountain was eroded. Parkinson (1947, pp. 51-52), the granite stone. He estimated that about 150 feet The granite is light pink, coarse has an average grain size of 10 mm, is of the lower part is exposed half a mile grained, somewhat porphyritic, and com­ brownish tinged with red and yellowish north of Sandy. posed mostly of microcline, quartz, green, and takes an exceptionally bril­ In its lower part the Hickory is mas­ plagioclase, and some biotite. Accessory liant polish. It is composed mostly of sive, cross-bedded, coarse grained, and minerals are magnetite, fluorite, apatite, microperthite and quartz with lesser in places near its base contains micro­ titanite, and zircon. The granite contains amounts of hornblende and biotite. Pla­ cline granules and conglomerate lenses. a few small pegmatites, aplite bodies, gioclase is very scarce and is present as In its middle part beds are thinner and and quartz veins. crystals associated with the femic min­ cross-bedding is on a smaller scale. In its A Town Mountain (?) Granite dome erals. Accessory minerals are magnetite, upper part clay and silt are abundant; exhumed by Pedernales River extends apatite, and zircon. topographically this unit forms a soil­
Load more

Recommended publications
  • Cambrian Cephalopods
    BULLETIN 40 Cambrian Cephalopods BY ROUSSEAU H. FLOWER 1954 STATE BUREAU OF MINES AND MINERAL RESOURCES NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY CAMPUS STATION SOCORRO, NEW MEXICO NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY E. J. Workman, President STATE BUREAU OF MINES AND MINERAL RESOURCES Eugene Callaghan, Director THE REGENTS MEMBERS Ex OFFICIO The Honorable Edwin L. Mechem ...................... Governor of New Mexico Tom Wiley ......................................... Superintendent of Public Instruction APPOINTED MEMBERS Robert W. Botts ...................................................................... Albuquerque Holm 0. Bursum, Jr. ....................................................................... Socorro Thomas M. Cramer ........................................................................ Carlsbad Frank C. DiLuzio ..................................................................... Los Alamos A. A. Kemnitz ................................................................................... Hobbs Contents Page ABSTRACT ...................................................................................................... 1 FOREWORD ................................................................................................... 2 ACKNOWLEDGMENTS ............................................................................. 3 PREVIOUS REPORTS OF CAMBRIAN CEPHALOPODS ................ 4 ADEQUATELY KNOWN CAMBRIAN CEPHALOPODS, with a revision of the Plectronoceratidae ..........................................................7
    [Show full text]
  • Stratigraphy and Structure of the Subsurface Cambrian and Ordovician Carbonates of New York
    DOCUMENT RESUME ED 093 640 SE 017 316 AUTHOR Rickard, Lawrence V. TITLE Stratigraphy and Structure of the Subsurface Cambrian and Ordovician Carbonates of New York. INSTITUTION New York State Education Dept., Albany. PUB DATE 73 NOTE 30p. EDRS PRICE EF-$0.75 HC-$1.85 PLUS POSTAGE DESCRIPTORS Bibliographies; Earth Science; *Geology; Instruction; *Instructional Materials; *Maps; *Paleontology; Science Education IDENTIFIERS New York State Museum and Science Service ABSTRACT This publication presents a description pf 137 wells in New York State and adjacent parts of Pennsylvania. Correlations with surface exposures are established. Maps and cross sections display the thickness, structure, and stratigraphic relationships of the carbonates described. ,A paleogeologic map of New York State at the end of the Early Ordovician is presented. Two distinct series of rocks which comprise the Cambrian and Ordovician carbonates of New York'are described and studied in detail. The monograpil includes an extensive bibliography, several schematic figures and diagrams, and two appendices which give data relevant to the identification of control wells and subsurface data from control wells. (Author/EB) U S. DEPARTMENT OF HEALTH. EDUCATION B WELFARE NATIONAL INSTITUTE OF EDUCATION THIS DOCUMENT HAS BEEN REPRO OUCEO EXACTLY AS RECEIVED FRO': THE PERSON OR ORGANIZATION ORIGIN ATING IT POINTS OF VIEW OR OPINIONS STATED DO NOT NECESSARILY REPRE SENT OFFICIAL NATIONAL INSTITUTE DI EDUCATION POSITION OR POLICY Stratigraphy and Structure of .the', Subsurface Cambrian OrdoVician arbonates of New York LAWRENCE V. RICKARD NEW YORK STATE MUSEUM AND SCIENCE SERVICE MAP AND CHART SERIES NUMBER 18 The Ulu:Trill) of the Slate of New .York The Stale Education Department Albany, 1973 THE UNIVERSITY OF THE STATE OF NEW YORK Regents of the University (with years when terms expire) 1984 JOSEPH W.
    [Show full text]
  • Late Cambrian Hard Substrate Communities from Montana/ Wyoming: the Oldest Known Hardground Encrusters
    Late Cambrian hard substrate communities from Montana/ Wyoming: the oldest known hardground encrusters CARLTON E. BREIT, W. DAVID LIDDELL AND KRAIG L. DERSTLER Brett. Carlton E., Liddell, W. David & Derstler, Kraig L. 1983 10 IS: Late Cambrian hard substrate I JETHAIA communities from MontandWyoming: the oldest known hardground encrustcrs. Lethaia, Vol. 16, pp. 281-289. Oslo. ISSN 0024-1164. Hardground surfaces from the Late Cambrian Snowy Range Formation in MontanalWyoming are the oldest known non-reefal hard substrates exhibiting encrusting fossils. These surfaces range in age from Early Franconian to early Trempealeauan. Hardgrounds were developed on slightly hummocky to planar, truncated surfaces of glauconite-rich, carbonate, flat pebble conglomerates, which were deposited during episodes of storm scouring in shallow subtidal environments of the Montana/Wyoming shelf. Snowy Range hardgrounds are encrusted by a low diversity assemblage of fossils dominated by simple discoidal holdfasts of pelmatozoans, probably crinoids, and including small conical spongiomorph algae? and probable stromatolites. Macroborings (e.g. Trypanites) are notably absent from all hardground surfaces, although sharp-walled, vertical, cylindrical holes (borings?) occur in micrite clasts imbedded in certain flat pebble conglomerates. No evidence of faunal succession or microecologic partitioning of irregular surfaces was observed on these Cambrian hardgrounds. 0 Hardgrounds, epibionts, macrobor- ings, pelmatozoan echinoderms, paleoecology, Cambrian, MontanaiWyoming. Cariton E. Brett, Department of Geological Sciences, The University of Rochesrer, Rochester. New York 14627; W. David Liddell, Department of Geology, Utah Stare University, Logan, Utah 84322; Kraig L. Derstler, Department of Geology, University of New Orleans, New Orleans, Louisiana 70122; 9th September, 1982. Hardgrounds afford a unique opportunity for pa- morph algae? and pelmatozoan echinoderm leoecological studies.
    [Show full text]
  • Alphabetical List
    LIST E - GEOLOGIC AGE (STRATIGRAPHIC) TERMS - ALPHABETICAL LIST Age Unit Broader Term Age Unit Broader Term Aalenian Middle Jurassic Brunhes Chron upper Quaternary Acadian Cambrian Bull Lake Glaciation upper Quaternary Acheulian Paleolithic Bunter Lower Triassic Adelaidean Proterozoic Burdigalian lower Miocene Aeronian Llandovery Calabrian lower Pleistocene Aftonian lower Pleistocene Callovian Middle Jurassic Akchagylian upper Pliocene Calymmian Mesoproterozoic Albian Lower Cretaceous Cambrian Paleozoic Aldanian Lower Cambrian Campanian Upper Cretaceous Alexandrian Lower Silurian Capitanian Guadalupian Algonkian Proterozoic Caradocian Upper Ordovician Allerod upper Weichselian Carboniferous Paleozoic Altonian lower Miocene Carixian Lower Jurassic Ancylus Lake lower Holocene Carnian Upper Triassic Anglian Quaternary Carpentarian Paleoproterozoic Anisian Middle Triassic Castlecliffian Pleistocene Aphebian Paleoproterozoic Cayugan Upper Silurian Aptian Lower Cretaceous Cenomanian Upper Cretaceous Aquitanian lower Miocene *Cenozoic Aragonian Miocene Central Polish Glaciation Pleistocene Archean Precambrian Chadronian upper Eocene Arenigian Lower Ordovician Chalcolithic Cenozoic Argovian Upper Jurassic Champlainian Middle Ordovician Arikareean Tertiary Changhsingian Lopingian Ariyalur Stage Upper Cretaceous Chattian upper Oligocene Artinskian Cisuralian Chazyan Middle Ordovician Asbian Lower Carboniferous Chesterian Upper Mississippian Ashgillian Upper Ordovician Cimmerian Pliocene Asselian Cisuralian Cincinnatian Upper Ordovician Astian upper
    [Show full text]
  • Dolomitic Limestone
    GUIDEBOOK TO FIELD TRIPS NEW YORK STATE GEOLOGICAL ASSOCIATION 37th Annual Meeting -i Philip C. Hewitt and Leo M. Hall Editors Contributing Authors Donald W. Fisher* Yngvar W. Isachsen* Philip C. Hewitt Robert G. LaFleur William E. McClennan Harold Nilsson Host UNION COLLEGE Schenectady, N. Y. April 1-May 2, 1965 * Published by permission of the Assistant Commissioner, New York State Museum and Science Service. Preface The area surrounding Schenectady provides a wealth of material for the student of geology. Lying in an area of sedimentary rock containing plentiful fossils, it is also possible to study metamorphic and igneous rock within a very short distance of Schenectady. Structure, stratigraphy, sedimentation, paleontology, in all aspects the region is classic ground in the field of geology. The Adirondacks, Taconics, Helderbergs, and the Mohawk and Hudson Valleys each provide wonderful sites of interest to the student and of great use to the teacher. In planning a series of field trips such as those for this 37th Annual Meeting of the New York State Geological Association, it is difficult to decide just which of these areas to cover. Since the Taconic area has been visited recently by the Association and the Lower Devonian was so well treated at the 36th Annual Meeting at Syracuse, it was decided that totally different trips should be presented. Therefore, the lower Mohawk Valley (a region of prime interest) and the southeastern Adirondacks (a critical area in the early history of eastern North America) were decided upon as being of sufficient distinction to provide a new phase of the geology of this part of New York State.
    [Show full text]
  • Regional Stratigraphy and Petroleum Systems of the Appalachian Basin, North America
    U.S. DEPARTMENT OF THE INTERIOR GEOLOGIC INVESTIGATIONS SERIES U.S. GEOLOGICAL SURVEY MAP I–2768 SOUTHWEST NORTHEAST 85° W 80° W 75° W INTRODUCTION In addition to the major packages of siliciclastic rocks, there are two minor packages Age 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 General Age of siliciclastic rocks that were deposited at approximately 480 to 475 million years North North Although more than 100 years of research have gone into deciphering the ago (St. Peter Sandstone) and at approximately 389 to 387 million years ago (million Features (million Periods Epochs American American East- North- North- Central Eastern Western Eastern South- South- Central North- Northern Western South- East- South- South- North- North- North- Southern Western West- East- Sequences Sequence Periods 45° N 45° N Paleozoic stratigraphy of the Appalachian Basin of North America, it remains a (Oriskany Sandstone). These two minor packages of siliciclastic rocks are present years central east west Tenn. Tenn. Va. Ky. west east W.Va. west W.Va. Md. east central west east east west central Ontario N.Y. central central Boundaries (Interpreted years Lake challenge to visualize the basin stratigraphy on a regional scale and to describe within predominantly carbonate strata and they are not associated with significant Series Stages Huron Events) ago) WISCONSIN stratigraphic relations within the basin. Similar difficulties exist for visualizing and fining-upwards or coarsening-upwards trends. Furthermore, these siliciclastic rocks ago) Ala. Ala. Ga. W.Va. W.Va. W.Va.
    [Show full text]
  • Systematics, Environment, and Biogeography of Some Late Cambrian and Early Ordovician Trilobites from Eastern New York State
    Systematics, Environment, and Biogeography of Some Late Cambrian and Early Ordovician Trilobites From Eastern New York State GEOLOGICAL SURVEY PROFESSIONAL PAPER 834 Systematics, Environment, and Biogeography of Some Late Cambrian and Early Ordovician Trilobites From Eastern New York State By MICHAEL E. TAYLOR and ROBERT B. HALLEY GEOLOGICAL SURVEY PROFESSIONAL PAPER 834 The environmental setting and regional significance of two trilobite assemblages from shelf deposits of the fVhitehall Formation in the southern Champlain Valley UNITED STATES GOVERNl\1ENT PRINTING OFFICE, WASHINGTON 197 4 UNITED STATES DEPARTMENT OF THE INTERIOR ROGERS C. B. MORTON, Secretary GEOLOGICAL SURVEY V. E. McKelvey, Director Library of Congress catalog-card No. 73-60031 S For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price $1.35 (paper covers) Stock Number 2401-02459 CONTENTS Page Page Abstract 1 Systematic paleontology ------------------------­ 18 Introduction 1 Introductory statement ---------------------­ 18 Objectives ----------------------------------­ 1 Class Trilobita Walch, 1771 -----------------­ 19 Geologic setting ----------------------------­ 1 Family Catillicephalidae Raymond, 1938 --­ 19 Previous work ------------------------------­ 2 Genus Acheilops Ulrich, 1931 --------­ 19 Fossil collections ----------------------------­ 2 Genus Stenoc.hilina Ulrich, 1931 ------- 20 Acknowledgments --_- ------------------------ 2 Family Heterocaryonidae Hupe, 1953 _____ _ 21 Biostratigraphy ---------------------------------
    [Show full text]
  • Arcview Print
    R03W R11W R10W R09W R08W R07W R06W R05W R04W o Ops Ops Ops Ops o Ogp # 92 00' # 43 30' R14W R13W R12W Dw Dw ### # Kw Dw # Kw # o # 43 30' # # # # Ops # ALLAMA# KEE Dc Ogp ### Ops # # # # Dc # # # # # # Dw # # # # # # r WINNESHIEK # # HOWARD e Om # # iv ## # Ops # # # # R # # a ## # # # w # # # Io # Dc r # Ops # e # # # # Ops T100N p # # Ogp # p # # U # Dc # # # # # Ops # # # Om # # # # # ## # Om # # # # # # # # Cjl Cw # # # # Om # # # # Cjl # 52 # # # /( # Ogp # # # # # # # # # # # # # 63 # ( Ogp r # # / # e # # # Ogp # iv # # Dw R Ops Dc Dc # # # # Dw # a ## # w # # o Ops Ops # # I # # # # # r # e # # p # # # # Om# p # Ops U # # # Ogp # # # Ops # Ogp # # # # # # # T99N # Cresco # # # # # # ## # DIGITAL GEOLOGIC MAP OF IOWA # # # # # # # # # # # Ogp # # Dw # # 9 !"9 # # !" # # # # M # # # # IS PHASE 2: NORTHEAST IOWA # # S # Ogp # IS # # # # S Ogp ### # IP # PI # # # R # # IV ## # # # # E # Dc # # # # # R # # # # Ogp # Prepared by # Ogp # # Decora# h Ogp Ops # # # # # # ## # # Dc # # Dw # # # # # # Brian J. Witzke # T # # # Ogp u # # # r Ogp # # k # Dc # # Greg A. Ludvigson # e # # y # # # # # # # # # # # # ## # # # R # # # # # # Dw # # # # i ## # # Robert M. McKay v # # # # # # # # # e # # # T98N # Ogp Kw # Dc r # # # # # # # C # Ogp # # # Ops Raymond R. Anderson # r # 9 ## # a # !" Kw Ogp n # ## # # e # # ## Bill J. Bunker # Waukon C # # # # # Cjl # # r # # # # # e # Om # # e Dc # # # James D. Giglierano # k # Dc # Ogp # # # # # # # John P. Pope # # # Cw # # 9 # Kw # " # # # ! Ogp # Adrian E. Goettemoeller Dc # # # # # # # Ogp # # #
    [Show full text]
  • Paleozoic Formations the Wind River Basin Wyoming
    • Paleozoic Formations Ill the Wind River Basin Wyoming GEOLOGICAL SURVEY PROFESSIONAL PAPER 495-B Prepared in cooperation with the Geological Surve_y of Wyoming and the Department of Geology of the University of Wyoming as part of a program of the Department of the Interior for development of the Missouri River basin Paleozoic Formations In• the Wind River Basin Wyoming By W. R. KEEFER and]. A. VAN LIEU GEOLOGY OF THE WIND RIVER BASIN, CENTRAL WYOMING GEOLOGICAL SURVEY PROFESSIONAL PAPER 495-B Prepared in cooperation with the Geological Survey of Wyoming and the Department of Geology of the University of Wyoming as part of a program of the Department of the Interior for development of the Missouri River basin UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON 1966 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director For sale by the Superintendent of Documents, Government Printing Office Washington, D.C., 20402 CONTENTS Page. Page Abstract __________________________________________ _ B1 Pennsylvanian rocks-Continued Introduction ______________________________________ _ 2 Tensleep Sandstone _____________ --- _- ----------- B40 General geographic and geologic setting _______________ _ 2 Permian rocks ______________ - ___ -_------------------ 43 General stratigraphic features _______________________ _ 6 l'romenclature _________________________________ _ 43 Cambrian rocks ___________________________________ _ 7 Park City Formation ___________________________ _ 44 Generalfeatures------------------------~-------
    [Show full text]
  • 1983 Geologic Time Scale
    The Decade of North American Geology 1983 Geologic Time Scale Compiled by Allison R. Palmer Centennial Science Program Coordinator Geological Society of America, P.O. Box 9140, Boulder, Colorado 80301 Preparation of the 27 synthesis volumes of The Geology of MESOZOIC North America for the Decade of North American Geology Base of Companion to end of Cretaceous (DNAG) is now in progress. In order to encourage uniformity Berggren, W. A., Kent, D. V., and Flynn, J. J., 1984, Appendix, among DNAG authors in the citation of numerical ages for chron- in Geochronology and the geologic record: Geological Society ostratigraphic units of the geologic time scale, an ad hoc Time of London (in press). Scale Advisory Committee was established by the DNAG Steering Base of Aptian to base of Santonian Committee in 1982. This advisory committee, consisting of Z. E. Harland, W. B„ Cox, A. V., Llewellyn, P. G„ Picton, C.A.G., Peterman (Chairman) and J. E. Harrison, U.S. Geological Survey; Smith, A. G., and Walters, R., 1982, A geological time scale: R. L. Armstrong, University of British Columbia; and W. A. Cambridge, Cambridge University Press, 128 p. Berggren, Woods Hole Oceanographic Institution, was asked to Base of Hettangian to base of Barremian (dating and chronostrati- evaluate numerical dating schemes that were either recently pub- graphic correlation of the "M" series) lished or in press and to provide recommendations for the best Kent, D. V., and Gradstein, F. M., 1984, A Jurassic to Recent numbers to use in preparation of a DNAG time scale. The chart chronology, in Tucholke, B.
    [Show full text]
  • Cambrian Trilobites of East-Central Alaska
    Cambrian Trilobites of East-Central Alaska GEOLOGICAL SURVEY PROFESSIONAL PAPER 559-B Cambrian Trilobites of East-Central Alaska By ALLISON R. PALMER LOWER PALEOZOIC PALEONTOLOGY AND STRATIGRAPHY OF EAST-CENTRAL ALASKA GEOLOGICAL SURVEY PROFESSIONAL PAPER 559-B Biostratigraphy and geological history of Cambrian deposits of east-central Alaska; 12 J species representing <?/ genera of trilobites of Cambrian age are described UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1968 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director Library of Congress catalog^card No. G<S 67-27i5 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price $2 (paper cover) CONTENTS Page Page Abstract ___________________________________________ Bl Geological history of the Cambrian of eastern Alaska.___ B17 Introduction_______________________________________ 2 Problems for future investigation ______ 20 Acknowledgments.- _ ________________________________ 4 Systematic paleontology______________ 20 23 General stratigraphy and principal collecting areas______ 4 Agnostida______-___ _____________ Redlichiida _____________________ 38 Composition and correlation of the faunas _____________ 5 Corynexochida __________________ 41 Early Cambrian________________________________ 5 Pty chopariida __________________ 51 Middle Cambrian_______________________________ 8 Unassigned trilobites_____________ 82 Late Cambrian_--_-___________________-_--__.__ 10 Indeterminate or undescribed taxa. 104 Biogeographic significance of the Alaskan Cambrian References cited.____________________ 105 trilobites_ _ __-_----__-___-____-___-__________.__ 16 Index ___--_-_-____________-___.-__. 111 ILLUSTRATIONS fPlates 1-15 follow index; plate 16 is in pocket] PLATE 1, 2. Early Cambrian-1 fauna. 3. Early Cambrian-2 fauna. 4. Early Cambrian-3 fauna; Middle Cambrian-1 fauna. 5. Middle Cambian-1 fauna.
    [Show full text]
  • Geologic Map of La Crosse County
    Wisconsin Geological and Natural History Survey Bulletin 101 Geology of La Crosse County, Wisconsin Plate 1 Thomas J. Evans 2003 Explanation Organic material Organic material (peat and muck) in varying degrees of decomposition; p approximately 1 to several feet thick; dark brown to black where saturated; medium to dark brown where unsaturated due to tiling; found generally within areas of modern stream sediment in nonglacial stream valleys and on lowermost slopes of hillslope sediment; deposited during the Holocene. Windblown sediment Very fi ne- and fi ne-grained sand and coarse-grained silt; deposited during ws the Late Pleistocene. Unit ws: Sand, forming distinctive dunes up to 40 ft Figure 1. Relief map of La Crosse County (scale 1:600,000). wz high; dune landscapes were formed on Late Pleistocene sand and gravelly sand terraces. Unit wz: Coarse-grained silt (loess), up to 2 ft thick in low- relief upland areas, except where local topography permits greater thickness; maximum observed thickness is about 30 ft; found south of West Salem, where loess is thick and distinctive paha topography is present. Hillslope sediment Silty to gravelly material, depending on nature of material moved downslope hu due to mass wasting processes; a few feet to several feet thick; yellow to reddish yellow; poorly sorted; found along toeslopes of bedrock ridges; deposited primarily during the Late Pleistocene, but minor deposition continues. Ponded sediment Clay, silty clay, and clayey silt; ranging from 3 to 9 ft thick; ranges from light l olive brown to reddish brown; found on fi ne-grained sand of high terraces of nonglacial streams; overlain by silt (loess) in places; deposited during the Late Pleistocene.
    [Show full text]