DOCSLIB.ORG

Jurassic Stratigraphy of Utah and Colorado Lawrence C

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Jurassic Stratigraphy of Utah and Colorado Lawrence C New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/2 Jurassic stratigraphy of Utah and Colorado Lawrence C. Craig and Clifford N. Holmes, 1951, pp. 93-95 in: San Juan Basin (New Mexico and Arizona), Smith, C. T.; Silver, C.; [eds.], New Mexico Geological Society 2nd Annual Fall Field Conference Guidebook, 163 p. This is one of many related papers that were included in the 1951 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Since 1950, the New Mexico Geological Society has held an annual Fall Field Conference that visits 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 papers. These books have set the national standard for geologic guidebooks and are an important reference for anyone working in or around New Mexico. Free Downloads The New Mexico Geological Society has decided to make our peer-reviewed Fall Field Conference guidebook papers available for free download. Non-members will have access to guidebook papers, but not from the last two years. Members will have access to all papers. 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 the societies' operating budget. Therefore, only research papers will be made available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content will remain available only in the printed guidebooks. This will encourage researchers to purchase the printed guidebooks, which are essential references for geologic research in New Mexico and surrounding areas. Copyright Information Publications of the New Mexico Geological Society, printed and electronic, are protected by the copyright laws of the United States. No material from our website or printed and electronic publications may be reprinted or redistributed without our permission. Contact us for permission to reprint portions of any of our publications. One printed copy of any materials from our website or our print and electronic publications may be made for individual use without our permission. Teachers and students may make unlimited copies for educational use. Any other use of these materials requires permission. This page is intentionally left blank to maintain order of facing pages. I NEW MEXICO GEOLOGICAL SOCIETY * SECOND FIELD CONFERENCE * SAN JUAN BASIN ! JURASS IC FORMATIO NS OF T HE SOUTH AND Thispaper deals with the classification of Jurassic WEST SIDES OF THE SAN JUAN BASIN stratain Coloradoand Utah exceptnorth-central Utah. NEW MEXICO AND ARIZONA The Glen Canyongroup consistsof the Wingate I sandstone,Kayenta formation, and Navajosandstone TheJurassic formations of the southand west in ascendingorder. The age assignmentof the Glen sldesofthe San Juan Basin form an extremelycomplex Canyonis in questionbecause of the lackof diagnostic i systemof sediments.They are nearlyal[ non-marine fossils.This group is tentativelyassigned to the and weredeposited in similarenvironments giving rise Jurassic.A recognizablehiatus is lackingat the to nearlyidentical lithologies and sedimentary structures, base of The Glen Canyon;the componentformations Any discussionof theseformations cannot avoid going are separatedin most placesonly by gradational i far afieldfrom the confinesof the SanJuan Basin andarbitrary contacts. properbecause nearly all of the formationalnames usedhave their type localities beyond the margins The Wingatesandstone and Kayentaformation I of theBasin.Generalizeddescriptions of the form- formtwo broadlens-shapeddeposits extending ationsare dividedgeographically, partly because throughall of southeasternUtah and intosouthwestern of the areasUsed as typelocalities and partlybe- Colorado.The Wingateis mostlyeolian in character causeof the familiarityof the authorswith more in the centerof thisarea but shows increasing effects I localizedoccurrences, of subaqueousdeposition to the northand east.The Kayentais fluviatilein origin.The westernlimit The threepapers which comprise this discussion of the Wingateand Kayentais betweenthe Circle werefirst presented at the conferenceon Jurassic Cllffsand Zion Canyonareas of southwesternUtah. I stratigraphyat the annualmeeting of the New Mex- The characterof thislimit is notclearly described ic0 GeologicalSociety on April 6, 1951. Some in the literatureand considerabledifference of conclusionsin thesearticles may alreadybe outdated opinionprevai[s concerning its position.The north- I becauseof currentfield work by variousbranches of westernand northernlimit lies beneaththe Wasatch the U. S. GeologicalSurvey on mineralresources Plateauand the Uinta Basin.To the east the Wingate and groundwater, continued field work by the and Kayentalose theiridenty along a north-south geologicalstaff of the A. E.C.in the regionand the line in southwesternColorado, as a resultof various i activitiesof privatecompanies and individuals.The combinationsof facieschange convergence,and firstpaper describes the formationsas theyappear erosion.The name Doloresformation has been applied in Coloradoand Utah and servesto introducemuch in southwesternColorado to the intervalthought to I of the nomenclature,Thesecondpaperdescribes containinseparableequivalentsof formationsof the the unitsas theyoccur in the NavajoReservation Glen Canyongroup and the UpperTriassic series. and appliesmost directly to thewest side of theSan Juan Basin.The thirdpaper attemptsto sunxnarize The Navajosandstone forms an irregularwedge I the problemspresented by the firsttwo papersand to of predominantlyeolian sandstone extending through suggestregional distribution patterns and their all southernand easternUtah into southwesternCola- controls, rado. The Navajois thickestin southwesternUtah and correspondsto the even thickerAztec Sandstone i JURASSIC STRATIGRAPHY OF UTAH of southernNevada. The Navajothins to the north AND COLORADO* and east and is correlatedwith the Nuggetsandstone of centralUtah and southwesternWyoming. This unit i LawrenceC. Craig and CliffordN. Holmes** extendssoutheastward into the centralColorado basin as far as Rifle.In southwesternColorado the Navajo (Abstractof a paperpresented before the reachesa featheredge,probably as a resultof both New Mexico GeologicalSociety, depositionalconvergence and pre-SanRafael erosion. I April6, 1951) Jurassicrocks of the ColoradoPlateau are I dividedinto threemajor units -- the Glen Canyon group,San Rafaelgroup and Morrlsonformation in *Publicationauthorized by the D~rector,U.S. ascendingorder. This classificationcan be extended GeologicalSurvey. I to mostof the Jurassicrocks of Utahand Colorado. ** Geologists,U. S. GeologicalSurvey. ! 93 | | NEW MEXICO GEOLOGICAL SOCIETY *SECOND FIELD CONFERENCE * SAN JUANBASIN " ggg~ I TheSan Rafael group is divldedinto’four form- greenishsandstone and minor greenish shale; the ations-- the Carmelformation, Entrada sandstone, Summervilleis predominantly redsilty shale and Curtisformation and Summervilleformation, in sandstone.Both overlie the Entrada conformably n ascendingorder. The Carmelhas beendated as exceptin centralUtah, where an angularuncon- II earlyUpper Jurassic and theCurtis as middleUpper formitylocally marks the baseof theCurtis. The Jurassicfrom marine invertebrate fossils. The Curtisformation has beenrecognized in southwestern, gg Entradaand Summerville lack diagnosticfossll remains, centraland northeastern Utah and in northwestern g Colorado.Unfossiliferous thln-bedded sandstones and The Carmelformation was depositedthroughout shalesalong the northern part of theFront Range in southernUtah. It is notpreserved west of south- Coloradomay be equivalentto the Curtis.Thick n westernUtah. It thinsto thenortheast and reaches gypsumdeposits southwest of the AncestralUncompahgre U a featheredgein southwesternColorado. A limes- Upliftand southeast of theAncestral Front Range stone-and gypsum-bearing sandstone and shale Upliftprobably formed in restrictedparts of theCurtis gg Sea.The Summervilleformation has beenrecognized faciesin centraland southwesternUtah has been ¯mm dlstinguishedfrom a redsilty sandstone facies in throughoutsouth-central and southeasternUtah and southeasternUtah. A criticalstudy of faciesrelations partof southwesternColorado. Where both formations in southeasternUtah is necessaryto determinethe arepresent the Summerville overlies the Curtis. In ¯ extentof thered silty sandstone facies of theCarmel northeasternUtah and northwestern Colorado the II intoNew Mexicoand Arizona. Curtisoccupies the entire interval between the Entradasandstone and the Morrlsonformation. South- TheEntrada sandstone was deposited throughout eastwardfrom central and south-central Utah~ the g southernand eastern Utah and most of Colorado.It Curtisgrades into the Summerville and theSummer- HI correlateslocally with the Garo sandstone (Stark et villeoccupies the entire interval between the Entrada al.,1949) Exeter sandstone (Lee, W. T. 1902) and the Morrison.In a north-southbelt through Moab, [] thelower part of theSundance formation in central Utah,the Moabtongue of theEntrada sandstone occupies g and easternColorado. A red earthysandstone facies mostof theinterval between the Entrada and the in centraland southwestern Utah has been distinguished Morrlson.To the eastand westof Moab,and to the froma cleansandstone facies in Coloradoand eastern
Load more

Recommended publications
  • Geologic Studies of Union County, New Mexico
    Bulletin 63 New Mexico Bureau of Mines & Mineral Resources A DIVISION OF NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY Geologic Studies of Union County, New Mexico by Brewster Baldwin and William R. Muehlberger SOCORRO 1959 NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY KENNETH W. FORD, President NEW MEXICO BUREAU OF MINES & MINERAL RESOURCES FRANK E. KOTTLOWSKI, Director GEORGE S. Austin, Deputy Director BOARD OF REGENTS Ex Officio Bruce King, Governor of New Mexico Leonard DeLayo, Superintendent of Public Instruction Appointed William G. Abbott, Secretary-Treasurer, 1961-1985, Hobbs Judy Floyd, President, 1977-1981, Las Cruces Owen Lopez, 1977-1983, Santa Fe Dave Rice, 1972-1983, Carlsbad Steve Torres, 1967-1985, Socorro BUREAU STAFF Full Time MARLA D. ADKINS, Assistant Editor LYNNE MCNEIL, Staff Secretary ORIN J. ANDERSON, Geologist NORMA J. MEEKS, Department Secretary RUBEN ARCHULETA, Technician I ARLEEN MONTOYA, Librarian/Typist WILLIAM E. ARNOLD, Scientific Illustrator SUE NESS, Receptionist ROBERT A. BIEBERMAN, Senior Petrol. Geologist ROBERT M. NORTH, Mineralogist LYNN A. BRANDVOLD, Chemist JOANNE C. OSBURN, Geologist CORALE BRIEBLEY, Chemical Microbiologist GLENN R. OSBURN, Volcanologist BRENDA R. BROADWELL, Assoc. Lab Geoscientist LINDA PADILLA, Staff Secretary FRANK CAMPBELL, Coal Geologist JOAN C. PENDLETON, Associate Editor RICHARD CHAMBERLIN, Economic Geologist JUDY PERALTA, Executive Secretary CHARLES E. CHAPIN, Senior Geologist BARBARA R. Popp, Lab. Biotechnologist JEANETTE CHAVEZ, Admin. Secretary I ROBERT QUICK, Driller's Helper/Driller RICHARD R. CHAVEZ, Assistant Head, Petroleum MARSHALL A. REITER, Senior Geophyicist RUBEN A. CRESPIN, Laboratory Technician II JACQUES R. RENAULT, Senior Geologist Lois M. DEVLIN, Director, Bus.-Pub. Office JAMES M. ROBERTSON, Mining Geologist KATHY C. EDEN, Editorial Technician GRETCHEN H.
    [Show full text]
  • Tetrapod Biostratigraphy and Biochronology of the Triassic–Jurassic Transition on the Southern Colorado Plateau, USA
    Palaeogeography, Palaeoclimatology, Palaeoecology 244 (2007) 242–256 www.elsevier.com/locate/palaeo Tetrapod biostratigraphy and biochronology of the Triassic–Jurassic transition on the southern Colorado Plateau, USA Spencer G. Lucas a,⁎, Lawrence H. Tanner b a New Mexico Museum of Natural History, 1801 Mountain Rd. N.W., Albuquerque, NM 87104-1375, USA b Department of Biology, Le Moyne College, 1419 Salt Springs Road, Syracuse, NY 13214, USA Received 15 March 2006; accepted 20 June 2006 Abstract Nonmarine fluvial, eolian and lacustrine strata of the Chinle and Glen Canyon groups on the southern Colorado Plateau preserve tetrapod body fossils and footprints that are one of the world's most extensive tetrapod fossil records across the Triassic– Jurassic boundary. We organize these tetrapod fossils into five, time-successive biostratigraphic assemblages (in ascending order, Owl Rock, Rock Point, Dinosaur Canyon, Whitmore Point and Kayenta) that we assign to the (ascending order) Revueltian, Apachean, Wassonian and Dawan land-vertebrate faunachrons (LVF). In doing so, we redefine the Wassonian and the Dawan LVFs. The Apachean–Wassonian boundary approximates the Triassic–Jurassic boundary. This tetrapod biostratigraphy and biochronology of the Triassic–Jurassic transition on the southern Colorado Plateau confirms that crurotarsan extinction closely corresponds to the end of the Triassic, and that a dramatic increase in dinosaur diversity, abundance and body size preceded the end of the Triassic. © 2006 Elsevier B.V. All rights reserved. Keywords: Triassic–Jurassic boundary; Colorado Plateau; Chinle Group; Glen Canyon Group; Tetrapod 1. Introduction 190 Ma. On the southern Colorado Plateau, the Triassic– Jurassic transition was a time of significant changes in the The Four Corners (common boundary of Utah, composition of the terrestrial vertebrate (tetrapod) fauna.
    [Show full text]
  • The Sauropodomorph Biostratigraphy of the Elliot Formation of Southern Africa: Tracking the Evolution of Sauropodomorpha Across the Triassic–Jurassic Boundary
    Editors' choice The sauropodomorph biostratigraphy of the Elliot Formation of southern Africa: Tracking the evolution of Sauropodomorpha across the Triassic–Jurassic boundary BLAIR W. MCPHEE, EMESE M. BORDY, LARA SCISCIO, and JONAH N. CHOINIERE McPhee, B.W., Bordy, E.M., Sciscio, L., and Choiniere, J.N. 2017. The sauropodomorph biostratigraphy of the Elliot Formation of southern Africa: Tracking the evolution of Sauropodomorpha across the Triassic–Jurassic boundary. Acta Palaeontologica Polonica 62 (3): 441–465. The latest Triassic is notable for coinciding with the dramatic decline of many previously dominant groups, followed by the rapid radiation of Dinosauria in the Early Jurassic. Among the most common terrestrial vertebrates from this time, sauropodomorph dinosaurs provide an important insight into the changing dynamics of the biota across the Triassic–Jurassic boundary. The Elliot Formation of South Africa and Lesotho preserves the richest assemblage of sauropodomorphs known from this age, and is a key index assemblage for biostratigraphic correlations with other simi- larly-aged global terrestrial deposits. Past assessments of Elliot Formation biostratigraphy were hampered by an overly simplistic biozonation scheme which divided it into a lower “Euskelosaurus” Range Zone and an upper Massospondylus Range Zone. Here we revise the zonation of the Elliot Formation by: (i) synthesizing the last three decades’ worth of fossil discoveries, taxonomic revision, and lithostratigraphic investigation; and (ii) systematically reappraising the strati- graphic provenance of important fossil locations. We then use our revised stratigraphic information in conjunction with phylogenetic character data to assess morphological disparity between Late Triassic and Early Jurassic sauropodomorph taxa. Our results demonstrate that the Early Jurassic upper Elliot Formation is considerably more taxonomically and morphologically diverse than previously thought.
    [Show full text]
  • Surface Geology Wind/Bighorn River Basin Wyoming and Montana
    WYOMING STATE GEOLOGICAL SURVEY Plate I Thomas A. Drean, State Geologist Wind/Bighorn Basin Plan II - Available Groundwater Determination Technical Memorandum Surface Geology - Wind/Bighorn River Basin SWEET GRASS R25E R5E R15E R30E R10E R20E MONTANA Mm PM Jsg T7S KJ !c Pp Jsg KJ water Qt Surface Geology Ti ! Red Lodge PM DO PM PM Ts Ts p^r PM N ^r DO KJ DO !c Wind/Bighorn River Basin Tts Mm water Mm Ti Ti ^r DO Kmt Ti LOCATION MAP p^r ^r ^r Qt WYOMING Wyoming and Montana Kf Qt Ti p^r !c p^r PM 0 100 250 Miles Tts ^r PM DO Ti Jsg MD Ts Ti MzPz Kmv !Pg Qt compiled DO DO Tts Ts Taw DO DO DO water Qt Kc PM ^r Twl Qt Ob O^ by ^r Mm DO !c MD MONTANA Thr Ti Kc Qr Klc p^r Kmv Kc : # Ts ^r : O^ Nikolaus Gribb, Brett Worman, # Ts # water : PM Taw # Kf : PM !cd : Ket Qb Taw Qu Twp Thr # Ki Twl 345 P$Ma : Thr O^ Qa KJg Tfu : Jsg ^r Qu : :: # Kl (! KJk : Qr Qls Tomas Gracias, and Scott Quillinan Qb : Thr Ts Taw # Tfu 37 PM Kft: : # :: T10S Qls # Thr : # ^r Kc (! Kft Kmt # :::::: p^r :: : Qu KJk Kc MD Taw DO Qu # p^r Qg :: Km KJ WYOMING Taw Ti : Kl 2012 Thr : Qb # # # Qg : water DO Qls ::: !c !Pg !cd MDO water water Kc Qa :::::: :: Kmt ::: : Twl 90 : Ti Ts Qu Qa Qg Kmv !Pcg Mm KJk : Qg : 212 : Qu Qg £¤ Kmv KJ ¨¦§ Tts Taw p^r ^r # Kl : Kf Kf 338 Ob !cd Qu Qu Ttp # (! : : : p^r ::: !Pg O^ MD P$Ma Thr : Qa # DO Km Qls 343 ^r Qls Taw : Qb Qg Qls Qa Km Jsg water (! : Qb # !cd ^r Kc BighornLake : MD # Taw Qa Qls Qt MD A′ MD MD Qg Twl !Pg Qu Qb Tii # Twp ^r water MzPz Qg Tfu Kl ::: Taw Taw Twp Qls : Qt Kmv Qa Ob P$Ma : Thr Qa # Tcr ^r water Qa Kft # Qt O^
    [Show full text]
  • Geology and Stratigraphy Column
    Capitol Reef National Park National Park Service U.S. Department of the Interior Geology “Geology knows no such word as forever.” —Wallace Stegner Capitol Reef National Park’s geologic story reveals a nearly complete set of Mesozoic-era sedimentary layers. For 200 million years, rock layers formed at or near sea level. About 75-35 million years ago tectonic forces uplifted them, forming the Waterpocket Fold. Forces of erosion have been sculpting this spectacular landscape ever since. Deposition If you could travel in time and visit Capitol Visiting Capitol Reef 180 million years ago, Reef 245 million years ago, you would not when the Navajo Sandstone was deposited, recognize the landscape. Imagine a coastal you would have been surrounded by a giant park, with beaches and tidal flats; the water sand sea, the largest in Earth’s history. In this moves in and out gently, shaping ripple marks hot, dry climate, wind blew over sand dunes, in the wet sand. This is the environment creating large, sweeping crossbeds now in which the sediments of the Moenkopi preserved in the sandstone of Capitol Dome Formation were deposited. and Fern’s Nipple. Now jump ahead 20 million years, to 225 All the sedimentary rock layers were laid million years ago. The tidal flats are gone and down at or near sea level. Younger layers were the climate supports a tropical jungle, filled deposited on top of older layers. The Moenkopi with swamps, primitive trees, and giant ferns. is the oldest layer visible from the visitor center, The water is stagnant and a humid breeze with the younger Chinle Formation above it.
    [Show full text]
  • Dinotracks.Indb 358 1/22/16 11:23 AM Dinosaur Tracks in Eolian Strata: New Insights Into Track Formation, Walking Kinetics and Trackmaker Behavior 18
    358 DinoTracks.indb 358 1/22/16 11:23 AM Dinosaur Tracks in Eolian Strata: New Insights into Track Formation, Walking Kinetics and Trackmaker Behavior 18 David B. Loope and Jesper Milàn Dinosaur tracks are abundant in wind-blown hooves of the bison deformed soft, laminated sediment – the Mesozoic deposits, but the nature of loose eolian sand perfect medium to preserve recognizable tracks. The next makes it difficult to determine how they are preserved. This windstorm buried the tracks. Today, the thick cover of grasses also raises the questions: Why would dinosaurs be walking protects the land surface so well that there are no soft, lami- around in dune fields in the first place? And, if they did go nated sediments for cattle to step on. And, if any tracks were, there, why would their tracks not be erased by the next wind somehow, to get formed, no moving sediment would be avail- storm? able to bury them. Mesozoic eolian sediments around the world, which have been the focus of a number of case studies Introduction in recent years, preserve the tracks of dinosaurs that walked on actively migrating sand dunes. This chapter summarizes Most dunes today form only in deserts and along shore- the known occurrences of dinosaur tracks in Mesozoic eo- lines – the only sandy land surfaces that are nearly devoid of lian strata and discusses their unique modes of preservation plants. Normally plants slow the wind at the ground surface and the anatomical and behavioral information about the enough that sand will not move even when the plant cover trackmakers that can be deduced from them.
    [Show full text]
  • (Arthropoda, Crustacea) from the Lower Jurassic Moenave Formation, Arizona and Utah, USA
    Journal of Paleontology, 92(4), 2018, p. 648–660 Copyright © 2018, The Paleontological Society. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/ licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. 0022-3360/18/0088-0906 doi: 10.1017/jpa.2017.150 The ‘Last Hurrah of the Reigning Darwinulocopines’? Ostracoda (Arthropoda, Crustacea) from the Lower Jurassic Moenave Formation, Arizona and Utah, USA Lucas S. Antonietto,1 Lisa E. Park Boush,1 Celina A. Suarez,2 Andrew R.C. Milner,3 and James I. Kirkland4 1Center for Integrative Geosciences, University of Connecticut, Charles Lewis Beach Hall, 354 Mansfield Road, U-1045, Storrs, Mansfield, Connecticut 06269, USA 〈[email protected]〉〈[email protected]〉 2Department of Geosciences, University of Arkansas, G. David Gearhart Hall, 340 North Campus Drive, Fayetteville, Arizona 72701, USA 〈[email protected]〉 3St. George Dinosaur Discovery Site at Johnson Farm, 2180 East Riverside Drive, St. George, Utah 84790, USA 〈[email protected]〉 4Utah Geological Survey, 1594 West North Temple, P.O. Box 146100, Salt Lake City, Utah 84114, USA 〈[email protected]〉 Abstract.—An ostracode fauna is described from lacustrine sediments of the Hettangian, Lower Jurassic, Whitmore Point Member of the Moenave Formation. The Moenave is well known for its rich, Late Triassic?–Early Jurassic fossil record, which includes fossil fishes, stromatolites, ostracodes, spinicaudatans, and a diverse ichnofauna of invertebrates and vertebrates. Four ostracode species, all belonging to the suborder Darwinulocopina, were recovered from these sediments: Suchonellina globosa, S.
    [Show full text]
  • Geohydrology of the Oklahoma Panhandle Beaver, Cimarron And
    GEOHYDROLOGY OF THE OKLAHOMA PANHANDLE, BEAVER, CIMARRON, AND TEXAS COUNTIES By D. l. Hart Jr., G. l. Hoffman, and R. L. Goemaat U. S. GEOLOGICAL SURVEY Water Resources Investigation 25 -75 Prepared in cooperation with OKLAHOMA WATER RESOURCES BOARD April 1976 UNITED STATES DEPARTMENT OF THE INTERIOR Thomas Kleppe, Secretary GEOLOGICAL SURVEY v. E. McKelvey, Director For additional information write to~ U.S. Geological Survey Water Resources Division 201 N. W. 3rd Street, Room 621 Oklahoma City, Oklahoma 73102 ii CONTENTS Pa,;e No. Factors to convert English units to metric units ..•..................... v Ab s t raet .. .. .. .. .. .. .. .. .. .. .. I' of '" " " of .. .. ••• .. of " •, '" 7 I ntroduc t ion. ......•....•............................................... 8 Purpose and scope of investigation 8 Location and general features of the area.••..........•............ 8 Previous investigations .•.......................................... 10 Well-numbering system.•...............................•............ 10 Acknowledgments. .......•......................................... .. 13 Geology. ....•.•....................................................... .. 13 ~ Regional geology ill .. II II II oil II oil It It It "" oil 13 Geologic units and their water-bearing properties 16 Permian System...•.......................•.................... 16 Permian red beds undifferentiated...............•........ 16 Triassic System..•.•.........•...........•.................... 16 Dockt.JIn Group ~ 4 ~ #' ., of ,. '" ., # of ,. ,. .. ". 16 Jurassic
    [Show full text]
  • Appendix 1 – Environmental Predictor Data
    APPENDIX 1 – ENVIRONMENTAL PREDICTOR DATA CONTENTS Overview ..................................................................................................................................................................................... 2 Climate ......................................................................................................................................................................................... 2 Hydrology ................................................................................................................................................................................... 3 Land Use and Land Cover ..................................................................................................................................................... 3 Soils and Substrate .................................................................................................................................................................. 5 Topography .............................................................................................................................................................................. 10 References ................................................................................................................................................................................ 12 1 OVERVIEW A set of 94 potential predictor layers compiled to use in distribution modeling for the target taxa. Many of these layers derive from previous modeling work by WYNDD1, 2, but a
    [Show full text]
  • Geologic Story of Canyonlands National Park
    «u GEOLOGICAL SURVEY BULLETIN 1327 JUL 1 7 1990 Dacus Library Wmthrop College Documents Department -T7 LOOKING NORTH FROM EAST WALL OF DEVILS LANE, just south of the Silver Stairs. Needles are Cedar Mesa Sandstone. Junction Butte and Grand View Point lie across Colorado River in background. GEOLOGICAL SURVEY BULLETIN 1327 UNITED STATES DEPARTMENT OF THE INTERIOR ROGERS C. B. MORTON, Secretary GEOLOGICAL SURVEY V. E. McKelvey, Director Library of Congress catalog-card No. 74-600043 Reprinted 1977 and 1990 U.S. GOVERNMENT PRINTING OFFICE : 1974 For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Federal Center, Box 25425, Denver, CO 80225 . Contents Page A new park is born 1 Major Powell's river expeditions 4 Early history 9 Prehistoric people 9 Late arrivals 14 Geographic setting 17 Rocks and landforms 20 How to see the park 26 The high mesas 27 Island in the Sky 27 Dead Horse Point State Park 30 North entrance 34 Shafer and White Rim Trails 34 Grand View Point 36 Green River Overlook 43 Upheaval Dome 43 Hatch Point 46 Needles Overlook 47 Canyonlands Overlook 48 U-3 Loop 49 Anticline Overlook 50 Orange Cliffs 54 The benchlands 5g The Maze and Land of Standing Rocks 58 The Needles district 60 Salt, Davis, and Lavender Canyons _ 64 The Needles and The Grabens 73 Canyons of the Green and Colorado Rivers 85 Entrenched and cutoff meanders 86 Green River 87 Colorado River _ 96 Summary of geologic history H2 Additional reading H7 Acknowledgments H8 Selected references n% Index 123 VII Illustrations Page Frontispiece .
    [Show full text]
  • Sequence Stratigraphic Expression of Flexural Subsidence: Middle
    SEQUENCE STRATIGRAPHIC EXPRESSION OF FLEXURAL SUBSIDENCE: MIDDLE JURASSIC TWIN CREEK LIMESTONE, WYOMING, U.S.A. by BOLTON HOWES (Under the Direction of Steve Holland) ABSTRACT In southwestern Wyoming, the Bajocian to Callovian Twin Creek Limestone records the incipient deposition on a foreland basin in the Sundance Seaway. The sequence stratigraphy of the Twin Creek Limestone is described in the Wyoming Range of southwestern Wyoming, and the geometry of the foreland basin is described mathematically based on estimates flexural rigidity of the underlying crust and the subsidence caused by a thrust load in central Idaho. Four depositional sequences are described. These sequences are correlated to the Bighorn Basin based on existing biostratigraphic correlations and descriptions of the sequence stratigraphic architecture of Middle Jurassic strata in the Bighorn Basin. Modeling of the flexural subsidence of the foreland basin indicates that to account for the geometry of the foreland basin some form of long-wavelength subsidence must be superimposed on the flexural subsidence associated with the thrust load in central Idaho. INDEX WORDS: carbonate rocks; Jurassic; foreland basin; sequence stratigraphy SEQUENCE STRATIGRAPHIC EXPRESSION OF FLEXURAL SUBSIDENCE: MIDDLE JURASSIC TWIN CREEK LIMESTONE, WYOMING, U.S.A. By BOLTON HOWES B.A., Macalester College, 2015 A Thesis Submitted to the Graduate Faculty of The University of Georgia in Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE ATHENS, GEORGIA 2017 © 2017 Bolton Howes All Rights Reserved SEQUENCE STRATIGRAPHIC EXPRESSION OF FLEXURAL SUBSIDENCE: MIDDLE JURASSIC TWIN CREEK LIMESTONE, WYOMING, U.S.A. by BOLTON HOWES Major Professor: Steven M. Holland Committee: L. Bruce Railsback David S.
    [Show full text]
  • Earliest Jurassic U-Pb Ages from Carbonate Deposits in the Navajo Sandstone, Southeastern Utah, USA Judith Totman Parrish1*, E
    https://doi.org/10.1130/G46338.1 Manuscript received 3 April 2019 Revised manuscript received 10 July 2019 Manuscript accepted 11 August 2019 © 2019 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license. Published online 4 September 2019 Earliest Jurassic U-Pb ages from carbonate deposits in the Navajo Sandstone, southeastern Utah, USA Judith Totman Parrish1*, E. Troy Rasbury2, Marjorie A. Chan3 and Stephen T. Hasiotis4 1 Department of Geological Sciences, University of Idaho, P.O. Box 443022, Moscow, Idaho 83844, USA 2 Department of Geosciences, Stony Brook University, Stony Brook, New York 11794, USA 3 Department of Geology and Geophysics, University of Utah, 115 S 1460 E, Room 383, Salt Lake City, Utah 84112-0102, USA 4 Department of Geology, University of Kansas, 115 Lindley Hall, 1475 Jayhawk Boulevard, Lawrence, Kansas 66045-7594, USA ABSTRACT with the lower part of the Navajo Sandstone New uranium-lead (U-Pb) analyses of carbonate deposits in the Navajo Sandstone in across a broad region from southwestern Utah southeastern Utah (USA) yielded dates of 200.5 ± 1.5 Ma (earliest Jurassic, Hettangian Age) to northeastern Arizona (Blakey, 1989; Hassan and 195.0 ± 7.7 Ma (Early Jurassic, Sinemurian Age). These radioisotopic ages—the first re- et al., 2018). The Glen Canyon Group is under- ported from the Navajo erg and the oldest ages reported for this formation—are critical for lain by the Upper Triassic Chinle Formation, understanding Colorado Plateau stratigraphy because they demonstrate that initial Navajo which includes the Black Ledge sandstone (e.g., Sandstone deposition began just after the Triassic and that the base of the unit is strongly Blakey, 2008; Fig.
    [Show full text]