DOCSLIB.ORG

Nature and Origin of the Moemkopi-Shinarump Hiatus in Monument Valley, Arizona and Utah

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Nature and Origin of the Moemkopi-Shinarump Hiatus in Monument Valley, Arizona and Utah Nature and origin of the Moenkopi-Shinarump hiatus in Monument Valley, Arizona and Utah Item Type text; Dissertation-Reproduction (electronic); maps Authors Gray, Irving Bernard, 1921- Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 23/09/2021 21:04:49 Link to Item http://hdl.handle.net/10150/565592 NATURE AND ORIGIN OF THE MOEMKOPI-SHINARUMP HIATUS IN MONUMENT VALLEY, ARIZONA AND UTAH Irving Biv Gray A Thesis Submitted to the Faculty of the DEPARTMENT OF GEOLOGY In Partial Fulfillment of the Requirements For the Degree of DOCTOR OF PHILOSOPHY In the Graduate College THE UNIVERSITY OF ARIZONA 19 6 1 THE UNIVERSITY OF ARIZONA GRADUATE COLLEGE I hereby recommend that this dissertation prepared under my direction by ______ Irving B. Gray_____________________________ _ entitled _____ Nature and Origin of the Moenkopi-Shinarump_______ Hiatus in Monument Valley, Arizona and Utah_______ be accepted as fulfilling the dissertation requirement of the degree of _________ Doctor of Philosophy_________________________ 7 /? / Dissertation Director After inspection of the dissertation, the following members of the Final Examination Committee concur in its approval and recommend its acceptance:* 55? . 7 — '2rC/~~C> f *This approval and acceptance is contingent on the candidate's adequate performance and defense of this dissertation at the final oral examination. The inclusion of this sheet bound into the library copy of the dissertation is evidence of satisfactory performance at the final examination. STATEMENT BY AUTHOR This thesis has been submitted in partial fulfillment of re­ quirements for an advanced degree at The University of Arizona and is deposited in The University Library to be made available to bor­ rowers under rules of the Library, Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgment of source is made. Requests for permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the head of the major department or the Dean of the Graduate College when in their judgment the proposed use of the material is in the interests of scholarship. In all other instances, however, permission must be obtained from the author. SIGNED: (3. APPROVAL BY THESIS DIRECTOR This thesis has been approved on the date shown below: JOHN F. LANCE D>te Professor of Geology NATURE AND ORIGIN OF THE HOENKOPI-SHINARUMP HIATUS IN MONUMENT VALLEY, ARIZONA AND UTAH "" y * Irving B? Gray ABSTRACT The Triassic age Moenkopi Formation, prior to recent erosion, was less than 20 feet to about 450 feet thick in the Monument Valley region of southeastern Utah and northeastern Arizona. The top of this formation is a Triassic age surface of erosion; coarse-grained Shinarump deposits rest upon this surface across the beveled strata of the Moenkopi in much of this region. Each of four members which constitute the Moenkopi Formation in Monument Valley thins in a southeast direction, indicating that formational thinning in that direction may have been, in part at least, a feature of deposition. The surface of erosion is believed to have been formed prior to, and during, deposition of the Shinarump and certain other Lower Chinle deposits. The final form of the surface in Monument Valley probably re­ sulted from Shinarump age modification of a pre-Shinarump valley system, and by later Shinarump age pedimentation which produced a broad erosion surface of low relief across the low Moenkopi hills and older Shinarump valley-fill deposits. ii It is believed that the streams which deposited the latest Moenkopi were incised into the Moenkopi Formation daring a regional up­ lift which brought Moenkopi deposition to a close. These streams may have continued to erode the pre-Moenkopi outcrops of their headwater areas and to transport this material through their valleys much as they had done during Moenkopi time. After a period of time the downcutting must have ended and the coarsest sediments in transit came to rest in the valley bottoms as earliest Shinarump. Valley widening followed as the streams aggraded their valleys during Shinarump time. The valleys were progres­ sively opened upward during aggradation until the streams and their de­ posits coalesced across the interfluve areas and formed the Shinarump blanket deposit. The streams which deposited the Shinarump as valley fills were probably slowly aggrading streams near grade; i.e., a slight but gradual steepening of the longitudinal profile of the streams was required (and satisfied by aggradation) to enable them to handle their loads. As they filled their valleys they progressively approached, and then finally at­ tained graded conditions, when they achieved the vertical position at which the blanket-shaped Shinarump stratum was formed. The Shinarump blanket deposit was emplaced upon the older Shinarump valley fills and adjacent beveled Moenkopi strata by streams at grade; i.e., by streams whose gradients were such that they provided just the velocity required to transport all of the supplied load. The surface upon which this blanket rests is a pediment surface. The Shinarump valley iii fills and pediment mantle were deposited pari passu with the development of the erosion surface in those areas where Shinarump was deposited. Thus, the long lapse of time between the Moenkopi and Shinarump is repre­ sented by both the unconformity and the gravel sheet. iv TABLE OF CONTENTS Page INTRODUCTION.................. 1 Purpose, Approach and Field Methods 1 Geography . ........ ......... 4 Geology.......... .......... 6 Previous iBwestigatioB . ........ 8 Acknowledgments . .......... 8 ■■ ; ' ■ THE BOUNDING STRATA . ........... 10 Moenkopi Formation . ..... ....... 10 Shinarump Member of the Chinle Formation . ............... 17 THE NATURE OF THE EROSION SURFACE . ....................... 20 General Description . ................. 20 Detailed Description . ......................... ..... 21 THE ORIGIN OF THE EROSION SURFACE . ..... ................. 27 General . ....... ...... .... 27 Historical Background ........ 27 Stokes* Ancient Pediment Concept 30 Evaluation of Stokes* Concept ... 34 Moenkopi-Shinarump Ligature ..... 36 THE CHANNELS AND CHANNEL PATTERN ... 41 Channel Morphology ..... 41 Channel Pattern Development . ...... ...... ..... 49 DEPOSITION OF THE SHINARUMP.............. ....... 52 Shinarump Streams...... 52 Shinarump Deposits ................................. 59 SUMMARY AND CONCLUSIONS . ......................... .... 68 APPENDIX— ECONOMIC GEOLOGY . ..... 88 REFERENCES C I T E D ... ......... 93 V LIST OF ILLUSTRATIONS Figure Page 1* General location map . .......... 2 2. Locations of measured sections . ............. 5 3. Isopach map of the Hoskinnini Member of the Moenkopi Formation . ................. ...... 13 4. Isopach.map of the.Lower SiItstone Member of the Moenkopi Formation . ................... 14 5. Isopach map of the Middle Sandstone Member of the Moenkopi Formation . .................. 15 6. Isopach map of the Upper Mudstone Member of the Moenkopi Formation.................. 16 7. Channel segment,in upper Nokai Wash . ............. 23 8. Channel segment on Hoskinnini M e s a ................ 24 9. Channel segment near Comb Ridge ................... 25 10. Previous and present designations of the Shinarump . ................... 61 11. Map showing pinchout areas of some basal Chinle sands... .......... 62 12. Location and direction of transport of the Monument Valley and White Canyon Shinarump ... ... 64 13. Schematic diagram of idealized White Canyon channel system . ......... 65 Plate Page 1. Isopach map of the Moenkopi Formation in Monument Valley . ......................... in pocket 2. Typical mesa exposure in central part of Monument Valley . ................ 12 vi Plate Page 3. Two examples of peneconteoporaneous deformation within the Shinaruap . ...... .......... ....... 18 4. Paleochannels of the Monument Valley Shinaruap ....... in pocket 5. Narrow, flaring D-shaped channel . .................. 43 6. Broad, flaring D-shaped channel . ........... 44 7. Subdued W-shaped channel .......................... 45 8. Broad, subdued ^-shaped channel ......................... 46 9; Broad, shallow swale . ..... 47 10. Two contrasting types of Shinaruap in Monument V a l l e y....... 67 Table Page 1. Field measurement data of the Moenkopi Formation ..... 73 2. Sedimentary rocks exposed in Monument Valley .... 7 vii INTRODUCTION Purpose, Approach, and Field Methods A study was made,of the Triassic age erosion surface at the top of the Moenkopi Formation in the Monument Valley region of Arizona and Utah (fig. 1). It was sponsored by the United States Atomic Energy Commission because of an apparent spatial relationship of certain paleo- topographic features of that surface to important uranium deposits. The purpose of the study was to learn more about the nature of the surface by reconstructing the shape of the erosion surface in greater de­ tail than had heretofore been done, and by recounting, if possible, the manner in which the surface was formed. Field studies were made by the writer from July 1954 to January 1958 while employed originally as a Project Geologist and later as an Area Geologist by
Load more

Recommended publications
  • Biochronology of the Triassic Tetrapod Footprints
    Geological Society, London, Special Publications Tetrapod footprints - their use in biostratigraphy and biochronology of the Triassic Hendrik Klein and Spencer G. Lucas Geological Society, London, Special Publications 2010; v. 334; p. 419-446 doi:10.1144/SP334.14 Email alerting click here to receive free email alerts when new articles cite this service article Permission click here to seek permission to re-use all or part of this article request Subscribe click here to subscribe to Geological Society, London, Special Publications or the Lyell Collection Notes Downloaded by on 15 June 2010 © 2010 Geological Society of London Tetrapod footprints – their use in biostratigraphy and biochronology of the Triassic HENDRIK KLEIN1,* & SPENCER G. LUCAS2 1Ru¨bezahlstraße 1, D-92318 Neumarkt, Germany 2New Mexico Museum of Natural History, 1801 Mountain Road NW, Albuquerque, NM 87104-1375 USA *Corresponding author (e-mail: [email protected]) Abstract: Triassic tetrapod footprints have a Pangaea-wide distribution; they are known from North America, South America, Europe, North Africa, China, Australia, Antarctica and South Africa. They often occur in sequences that lack well-preserved body fossils. Therefore, the question arises, how well can tetrapod footprints be used in age determination and correlation of stratigraphic units? The single largest problem with Triassic footprint biostratigraphy and biochronology is the non- uniform ichnotaxonomy and evaluation of footprints that show extreme variation in shape due to extramorphological (substrate-related) phenomena. Here, we exclude most of the countless ichnos- pecies of Triassic footprints, and instead we consider ichnogenera and form groups that show distinctive, anatomically-controlled features. Several characteristic footprint assemblages and ichnotaxa have a restricted stratigraphic range and obviously occur in distinct time intervals.
    [Show full text]
  • Geology and Mineral Resources of Sierra Nacimiento and Vicinity, New
    iv Contents ABSTRACT 7 TERTIARY-QUATERNARY 47 INTRODUCTION 7 QUATERNARY 48 LOCATION 7 Bandelier Tuff 48 PHYSIOGRAPHY 9 Surficial deposits 48 PREVIOUS WORK 9 PALEOTECTONIC SETTING 48 ROCKS AND FORMATIONS 9 REGIONAL TECTONIC SETTING 49 PRECAMBRIAN 9 STRUCTURE 49 Northern Nacimiento area 9 NACIMIENTO UPLIFT 49 Southern Nacimiento area 15 Nacimiento fault 51 CAMBRIAN-ORDOVICIAN (?) 20 Pajarito fault 52 MISSISSIPPIAN 20 Synthetic reverse faults 52 Arroyo Peñasco Formation 20 Eastward-trending faults 53 Log Springs Formation 21 Trail Creek fault 53 PENNSYLVANIAN 21 Antithetic reverse faults 53 Osha Canyon Formation 23 Normal faults 53 Sandia Formation 23 Folds 54 Madera Formation 23 SAN JUAN BASIN 55 Paleotectonic interpretation 25 En echelon folds 55 PERMIAN 25 Northeast-trending faults 55 Abo Formation 25 Synclinal bend 56 Yeso Formation 27 Northerly trending normal faults 56 Glorieta Sandstone 30 Antithetic reverse faults 56 Bernal Formation 30 GALLINA-ARCHULETA ARCH 56 TRIASSIC 30 CHAMA BASIN 57 Chinle Formation 30 RIΟ GRANDE RIFT 57 JURASSIC 34 JEMEZ VOLCANIC FIELD 59 Entrada Sandstone 34 TECTONIC EVOLUTION 60 Todilto Formation 34 MINERAL AND ENERGY RESOURCES 63 Morrison Formation 34 COPPER 63 Depositional environments 37 Mineralization 63 CRETACEOUS 37 Origin 67 Dakota Formation 37 AGGREGATE 69 Mancos Shale 39 TRAVERTINE 70 Mesaverde Group 40 GYPSUM 70 Lewis Shale 41 COAL 70 Pictured Cliffs Sandstone 41 ΗUMΑTE 70 Fruitland Formation and Kirtland Shale URANIUM 70 undivided 42 GEOTHERMAL ENERGY 72 TERTIARY 42 OIL AND GAS 72 Ojo Alamo Sandstone
    [Show full text]
  • Index 1 INDEX
    Index 1 INDEX A Blue Spring 76, 106, 110, 115 Bluff Spring Trail 184 Adeii Eechii Cliffs 124 Blythe 198 Agate House 140 Blythe Intaglios 199 Agathla Peak 256 Bonita Canyon Drive 221 Agua Fria Nat'l Monument 175 Booger Canyon 194 Ajo 203 Boundary Butte 299 Ajo Mountain Loop 204 Box Canyon 132 Alamo Canyon 205 Box (The) 51 Alamo Lake SP 201 Boyce-Thompson Arboretum 190 Alstrom Point 266, 302 Boynton Canyon 149, 161 Anasazi Bridge 73 Boy Scout Canyon 197 Anasazi Canyon 302 Bright Angel Canyon 25, 51 Anderson Dam 216 Bright Angel Point 15, 25 Angels Window 27 Bright Angel Trail 42, 46, 49, 61, 80, 90 Antelope Canyon 280, 297 Brins Mesa 160 Antelope House 231 Brins Mesa Trail 161 Antelope Point Marina 294, 297 Broken Arrow Trail 155 Apache Junction 184 Buck Farm Canyon 73 Apache Lake 187 Buck Farm Overlook 34, 73, 103 Apache-Sitgreaves Nat'l Forest 167 Buckskin Gulch Confluence 275 Apache Trail 187, 188 Buenos Aires Nat'l Wildlife Refuge 226 Aravaipa Canyon 192 Bulldog Cliffs 186 Aravaipa East trailhead 193 Bullfrog Marina 302 Arch Rock 366 Bull Pen 170 Arizona Canyon Hot Springs 197 Bush Head Canyon 278 Arizona-Sonora Desert Museum 216 Arizona Trail 167 C Artist's Point 250 Aspen Forest Overlook 257 Cabeza Prieta 206 Atlatl Rock 366 Cactus Forest Drive 218 Call of the Canyon 158 B Calloway Trail 171, 203 Cameron Visitor Center 114 Baboquivari Peak 226 Camp Verde 170 Baby Bell Rock 157 Canada Goose Drive 198 Baby Rocks 256 Canyon del Muerto 231 Badger Creek 72 Canyon X 290 Bajada Loop Drive 216 Cape Final 28 Bar-10-Ranch 19 Cape Royal 27 Barrio
    [Show full text]
  • The Origin of Comb Ridge
    THE ZEPHYR/ JUNE-JULY 2011 THE ORIGIN OF COMB RIDGE Robert Fillmore, Western State College of Colorado in Gunnison, CO (An excerpt and images from his new book: Geological Evolution of the Colorado Plateau) Comb Ridge is a lofty sinuous spine of red sandstone that stretch- ramp of Comb Ridge. Another notable result of this uplift is the es over 80 miles across northern Arizona and southeast Utah. This ensuing deep incision into the uplift by energized rivers as their monocline, as these structures are called, begins near Kayenta and runoff seeks a path to lower elevations. The deep narrow canyons snakes northward to fade away near the west flank of the Abajo of Cedar Mesa owe their existence to Monument Upwarp. Mountains. Monoclines are a peculiar component of the Colorado Plateau, with their long ridges of steeply tilted strata in a region otherwise known for its miles of flat-lying sedimentary rocks. They Monoclines are a peculiar component are hard to miss. Although not confined to the Colorado Plateau, of the Colorado Plateau, with their long ridges their concentration here is unique. Similar structures make up the of steeply tilted strata in a region San Rafael Swell, Capitol reef, and Colorado National monument otherwise known for its miles of near Grand Junction. All are closely related in origin and timing. flat-lying sedimentary rocks. They are hard to miss. The term monocline refers to a single-limbed fold; in simple geometric terms, a gargantuan ramp. The ramp of steeply tilted strata separates uplifted regions from those that have dropped The monoclines formed at the same time as the jagged Rocky downwards, relatively speaking.
    [Show full text]
  • Geology of the Shinarump No. 1 Uranium Mine, Seven Mile Canyon Area, Grand County, Utah
    GEOLOGICAL SURVEY CIRCULAR 336 GEOLOGY OF THE SHINARUMP NO. 1 URANIUM MINE, SEVEN MILE CANYON AREA, GRAND COUNTY, UTAH This report concerns work done on behalf of the U. S. Atomic Energy Commission and is published with the permission of the Commission. UNITED STATES DEPARTMENT OF THE INTERIOR Douglas McKay, Secretary GEOLOGICAL SURVEY W. E. Wrather, Director GEOLOGICAL SURVEY CIRCULAR 336 GEOLOGY OF THE SHINARUMP NO. 1 URANIUM MINE, SEVEN MILE CANYON AREA, GRAND COUNTY, UTAH By W. L Pinch This report concerns work done on behalf of the U. S. Atomic Energy Commission and is published with the permission of the Commission. __________Washington, D. C., 1954 Free on application to the Geological Survey, Washington 25, D. C. , B E A V E R * 'IRON .-'I GAR WASHINGTON L K«n«b'p U A.R I EXPLANATION Uranium deposit or group of deposits in the Shinarump conglomerate Uranium deposit or group of deposits in the Chfnle formation 25 0 I i i i i I Figure 1. Map of part of the Colorado Plateau showing the location of the Shinarump No. 1 mine and the distribu­ tion of uranium deposits in the Shinarump and Chinle formations. GEOLOGY OF THE SHINARUMP NO. 1 URANIUM MINE, SEVEN MILE CANYON AREA, GRAND COUNTY, UTAH By W. I. Finch CONTENTS Page Page Abstract..................................... 1 History and production........................ 4 Introduction.................................. 2 Ore deposits................................. 4 General geology............................... 2 Mineralogy.................................. 5 Stratigraphy............................. 2 Petrology.................................... 6 Stratigraphic section................ 2 Habits of ore bodies .......................... 9 Cutler formation.................... 3 Spectrographic study.......................... 10 Moenkopi formation................. 3 Age determinations of uraninite...............
    [Show full text]
  • Early Tetrapod Relationships Revisited
    Biol. Rev. (2003), 78, pp. 251–345. f Cambridge Philosophical Society 251 DOI: 10.1017/S1464793102006103 Printed in the United Kingdom Early tetrapod relationships revisited MARCELLO RUTA1*, MICHAEL I. COATES1 and DONALD L. J. QUICKE2 1 The Department of Organismal Biology and Anatomy, The University of Chicago, 1027 East 57th Street, Chicago, IL 60637-1508, USA ([email protected]; [email protected]) 2 Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire SL57PY, UK and Department of Entomology, The Natural History Museum, Cromwell Road, London SW75BD, UK ([email protected]) (Received 29 November 2001; revised 28 August 2002; accepted 2 September 2002) ABSTRACT In an attempt to investigate differences between the most widely discussed hypotheses of early tetrapod relation- ships, we assembled a new data matrix including 90 taxa coded for 319 cranial and postcranial characters. We have incorporated, where possible, original observations of numerous taxa spread throughout the major tetrapod clades. A stem-based (total-group) definition of Tetrapoda is preferred over apomorphy- and node-based (crown-group) definitions. This definition is operational, since it is based on a formal character analysis. A PAUP* search using a recently implemented version of the parsimony ratchet method yields 64 shortest trees. Differ- ences between these trees concern: (1) the internal relationships of aı¨stopods, the three selected species of which form a trichotomy; (2) the internal relationships of embolomeres, with Archeria
    [Show full text]
  • Triassic Stratigraphy of the Southeastern Colorado Plateau, West-Central New Mexico Spencer G
    New Mexico Geological Society Downloaded from: https://nmgs.nmt.edu/publications/guidebooks/72 Triassic stratigraphy of the southeastern Colorado Plateau, west-central New Mexico Spencer G. Lucas, 2021, pp. 229-240 in: Geology of the Mount Taylor area, Frey, Bonnie A.; Kelley, Shari A.; Zeigler, Kate E.; McLemore, Virginia T.; Goff, Fraser; Ulmer-Scholle, Dana S., New Mexico Geological Society 72nd Annual Fall Field Conference Guidebook, 310 p. This is one of many related papers that were included in the 2021 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, Color Plates, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. Copyright Information Publications of the New Mexico Geological Society, printed and electronic, are protected by the copyright laws of the United States.
    [Show full text]
  • Stratigraphic Correlation Chart for Western Colorado and Northwestern New Mexico
    New Mexico Geological Society Guidebook, 32nd Field Conference, Western Slope Colorado, 1981 75 STRATIGRAPHIC CORRELATION CHART FOR WESTERN COLORADO AND NORTHWESTERN NEW MEXICO M. E. MacLACHLAN U.S. Geological Survey Denver, Colorado 80225 INTRODUCTION De Chelly Sandstone (or De Chelly Sandstone Member of the The stratigraphic nomenclature applied in various parts of west- Cutler Formation) of the west side of the basin is thought to ern Colorado, northwestern New Mexico, and a small part of east- correlate with the Glorieta Sandstone of the south side of the central Utah is summarized in the accompanying chart (fig. 1). The basin. locations of the areas, indicated by letters, are shown on the index map (fig. 2). Sources of information used in compiling the chart are Cols. B.-C. shown by numbers in brackets beneath the headings for the col- Age determinations on the Hinsdale Formation in parts of the umns. The numbers are keyed to references in an accompanying volcanic field range from 4.7 to 23.4 m.y. on basalts and 4.8 to list. Ages where known are shown by numbers in parentheses in 22.4 m.y. on rhyolites (Lipman, 1975, p. 6, p. 90-100). millions of years after the rock name or in parentheses on the line The early intermediate-composition volcanics and related rocks separating two chronostratigraphic units. include several named units of limited areal extent, but of simi- No Quaternary rocks nor small igneous bodies, such as dikes, lar age and petrology—the West Elk Breccia at Powderhorn; the have been included on this chart.
    [Show full text]
  • Summits on the Air – ARM for the USA (W7A
    Summits on the Air – ARM for the U.S.A (W7A - Arizona) Summits on the Air U.S.A. (W7A - Arizona) Association Reference Manual Document Reference S53.1 Issue number 5.0 Date of issue 31-October 2020 Participation start date 01-Aug 2010 Authorized Date: 31-October 2020 Association Manager Pete Scola, WA7JTM Summits-on-the-Air an original concept by G3WGV and developed with G3CWI Notice “Summits on the Air” SOTA and the SOTA logo are trademarks of the Programme. This document is copyright of the Programme. All other trademarks and copyrights referenced herein are acknowledged. Document S53.1 Page 1 of 15 Summits on the Air – ARM for the U.S.A (W7A - Arizona) TABLE OF CONTENTS CHANGE CONTROL....................................................................................................................................... 3 DISCLAIMER................................................................................................................................................. 4 1 ASSOCIATION REFERENCE DATA ........................................................................................................... 5 1.1 Program Derivation ...................................................................................................................................................................................... 6 1.2 General Information ..................................................................................................................................................................................... 6 1.3 Final Ascent
    [Show full text]
  • 1 August 26, 2019 Sent Via E-Planning and Overnight Mail
    August 26, 2019 Sent via e-Planning and overnight mail Director (210) Attention Protest Coordinator, WO-210 P.O. Box 71383 Washington D.C. 20024-1383 Re: Protest of the Bears Ears National Monument Indian Creek and Shash Jáa Units Proposed Monument Management Plans and Final Environmental Impact Statement Please accept this protest of the Bureau of Land Management’s Bears Ears National Monument (BENM) Indian Creek and Shash Jáa Units Proposed Monument Management Plans and Final Environmental Impact Statement (MMP/FEIS), submitted by the Access Fund, Archaeology Southwest, Conservation Lands Foundation, Friends of Cedar Mesa, National Trust for Historic Preservation, Society for Vertebrate Paleontology and Utah Diné Bikéyah (Protesting Parties or Protestors). The Protesting Parties incorporate by reference the points and arguments raised in the protests filed by the Wilderness Society (and their partners), as well as by any tribes or tribally affiliated organizations. INTERESTS AND INVOLVEMENT OF THE PARTIES The Access Fund is a national advocacy organization whose mission keeps climbing areas open and conserves the climbing environment. A 501(c)(3) non-profit supporting and representing over 7 million climbers nationwide in all forms of climbing—rock climbing, ice climbing, mountaineering, and bouldering—the Access Fund is the largest US climbing organization with nearly 20,000 members and 120 affiliates. We currently hold memorandums of understanding1 with the Bureau of Land Management, National Park Service, and Forest Service to work together regarding how climbing is managed on federal land. The Access Fund provides climbing management expertise, stewardship, project specific funding, and educational outreach for climbing areas across the country including the BENM region, and Utah is one of our largest member states.
    [Show full text]
  • Utah Geology: Making Utah's Geology More Accessible. View South-East
    5/28/13 Utah Geology: Geologic Road Guides Utah Geology: Making Utah's geology more accessible. View south-east over St. George, Utah Road Guide Quick Select. Selection Map HW-160, 163 & 191 Tuba City to Kayenta, Bluff & Montecello, Utah (through Monument Valley) 0.0 Junction of U.S. Highways 160 and 89 , HW-160 Road Guide. follows U.S. Highway 160 east toward Tuba city and Kayenta. U.S. Highway 89 leads south toward the entrance to Grand Canyon National Park and Flagstaff. For a route description along U.S. Highway 89 northward from here see HW-89A Road Guide.. The road junction is in the Petrified Forest Member of the Chinle Formation. The member is composed of interbedded stream channel sandstone and varicolored shale and mudstone. This member erodes moderately easily and forms the strike valley to the north and south. From here the route of this guide leads upsection into younger and younger beds of the Chinle Formation. 0.7 Cross Hamblin Wash and rise from the Petrified Forest Member into the pinkish banded Owl Rock Member of the Chinle Formation. The upper member forms pronounced laminated pinkish gray and green badlands, distinctly unlike the rounded Painted Desert-type massive badlands of the underlying member. 1.6 Road rises up through the upper part of the Chinle Formation, a typical wavy to hummocky road. Highway construction is easy across the slope-forming parts of the formation, but holding the road after construction is difficult because the soft volcanic ash-bearing shales heave under load or after wetting and drying.
    [Show full text]
  • The First Occurrence of the Enigmatic Archosauriform Crosbysaurus Heckert 2004 from the Chinle Formation of Southern Utah Robert J
    The first occurrence of the enigmatic archosauriform Crosbysaurus Heckert 2004 from the Chinle Formation of southern Utah Robert J. Gay and Isabella St. Aude Science Department, Mission Heights Preparatory High School, Casa Grande, AZ, USA ABSTRACT Originally identified as an ornithischian dinosaur, Crosbysaurus harrisae has been found in New Mexico, Arizona, and its type locality in Texas, as well as in North Carolina. The genus has been reassessed by other workers in light of reinterpretations about the postcrania of another putative Triassic ornithischian, Revueltosaurus. The understanding of Triassic dental faunas has become more complicated by the extreme convergence between pseudosuchian archosaurs and ornithischian dinosaur dental morphologies. We report here on a new specimen of Crosbysaurus (MNA V10666) from the Chinle Formation at Comb Ridge in southeastern Utah. This new specimen is assigned to Crosbysaurus sp. on the basis of the unique compound posterior denticles, labiolingual width, and curvature. While MNA V10666 does not help resolve the aYnities of Crosbysaurus, it does represent the extension of the geographic range of this taxon for approximately 250 kilometers. This is the first record of the genus Crosbysaurus in Utah and as such it represents the northernmost known record of this taxon. This indicates that Crosbysaurus was not limited to the southern area of the Chinle/Dockum deposition but instead was widespread across the Late Triassic paleoriver systems of western Pangea. The reported specimen was found in close association with a typical Late Triassic Chinle fauna, including phytosaurs, metoposaurs, and dinosauromorphs. Submitted 13 November 2014 Accepted 31 March 2015 Subjects Paleontology Published 21 April 2015 Keywords Crosbysaurus, Chinle Formation, Chinle, Utah, Comb Ridge, New occurance, Corresponding author New record, Triassic, Late Triassic, Archosaur Robert J.
    [Show full text]