DOCSLIB.ORG

Geochronology of Torrejonian Sediments, Nacimiento Formation, San Juan Basin, New Mexico

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Geochronology of Torrejonian Sediments, Nacimiento Formation, San Juan Basin, New Mexico Geochronology of Torrejonian sediments, Nacimiento Formation, San Juan Basin, New Mexico Item Type text; Thesis-Reproduction (electronic) Authors Taylor, Louis Henry, 1944- 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 01/10/2021 18:33:30 Link to Item http://hdl.handle.net/10150/566500 GEOCHRONOLOGY OF TORREJONIAN SEDIMENTS, NACIMIENTO FORMATION, SAN JUAN BASIN, NEW MEXICO by Louis Henry Taylor A Thesis Submitted to the Faculty of the DEPARTMENT OF GEOSCIENCES In Partial Fulfillment of the Requirements For the Degree of MASTER OF SCIENCE In the Graduate College THE UNIVERSITY OF ARIZONA 1 9 7 7 STATEMENT BY AUTHOR This th e s is has been subm itted in p a r tia l f u lf illm e n t o f re ­ quirements for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers 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 th is m anuscript in whole or in p a rt may be granted by the head o f the major department or the Dean of the Graduate College when in his judg­ ment the proposed use of the material is in the interests of scholar­ ship. In all other instances, however, permission must be obtained from the author. SIGNED: APPROVAL BY THESIS DIRECTOR This thesis has been approved on the date shown below: 7 7 Date Associate Professor of Geosciences ACKNOWLEDGMENTS I thank Drs. E. H. Lindsay, R. F. B u tle r, and G. G. Simpson for their guidance and constructive criticism during the course of this project. I also thank Dr. Butler, S. L. Bressler, Y. Tomida, and R. A. Haskin for their assistance in measuring paleomagnetic specimens. Assistance in the collection of both paleomagnetic samples and fossils was provided by Drs. Lindsay, Butler, and L. L. Jacobs, III. Also indispensible in the field were J. G. Honey, L. J. Flynn, B. R. Standhardt, and Y. Tomida. For their help I thank them. I would also like to thank my wife Mary for her encouragement and fin a n c ia l support. i i i TABLE OF CONTENTS Page LIST OF ILLUSTRATIONS ...................................................................................... vi LIST OF TABLES ...................... v l l l ABSTRACT................................................................................................................. ix 1. INTRODUCTION .......................................................................................................... 1 2 . THE SAN JUAN B A S I N ........................................................................................... 5 Geography ........................................................................................................ 5 Geology ............................................................................................................. 7 Previous Geological Investigation .................................................. 8 3. THE NACIMIENTO FORMATION............................................................................. 11 Stratigraphic Nomenclature . .................................................. 11 Stratigraphy ............................................................................................... 13 4 . METHODS OF CHRONOLOGICAL CORRELATION .................................................. 18 B io s tra ti g r a p h i c ...................................................................................... 18 The T o rrejo n ian Land Mammal A g e .............................................. 19 Magnetostrati g ra p h ic ............................................................................. 21 Geomagnetic-Polarity Time Scale .............................................. 22 M e th o d s .................................................................................................... 23 5. STRATIGRAPHY ..... .................................................................... ... 37 The Study A r e a s ........................................................................................... 37 L ith o s tra tig ra p h y ....................................................................................... 43 B io s tr a tig r a p h y ................................................................................ ...... 45 M a g n e tic -P o la rity S tra tig ra p h y ....................................................... 52 6. GE0CHR0N0L0GIC CORRELATION ......................................................................... 60 The Ojo End no and Big Pocket A r e a s .............................................. 60 The Barrel Spring Arroyo Section .................................................. 65 7 . SUMMARY...................................................................................................................... 69 iv V TABLE OF CONTENTS-Continued Page APPENDIX A: PALEOMAGNETIC D A TA........................................................... 72 Locality 10, Ojo Encino A re a ......................................... .... 72 L o c a lity 11, Ojo Encino A r e a .................................................. 76 Composite S e ctio n , Big Pocket Area .............................................. 78 Radio Tower Section, Big Pocket Area ......................................... 87 REFERENCES CITED ............................................................................................... 88 LIST OF ILLUSTRATIONS Figure Page 1. Regional Map o f the San Juan B a s i n .................. ........................................ 3 2. Geologic Map of Nacimiento, Animas, and San Jose Form ations, San Juan B a s i n .............................................. 12 3. AF Demagnetization Curves and NRM Vector Motions, S ite SJ342 ...................................................................................................... 29 4. NRM Vector Motions, Site SJ480 30 5. NRM Vector Motions, Site SJ585 31 6. AF Demagnetization Curves and NRM Vector Motions, Site SJ356 ...................................................................................................... 32 7. NRM Vector Motions, Site SJ309 34 8. NRM Vector Motions, Site SJ482 35 9. AF Demagnetization Curves and NRM Vector Motions, S ite SJ044 36 10. Map o f the Ojo Encino A r e a ...................................................................................38 11. Map o f L o c a lity 10, Ojo Encino A r e a .................................................................39 12. Map of Locality 11, Ojo Encino Area . ............................................................. 40 13. Map o f the Big Pocket Area .................................................................................. 42 14. Lithologic Correlation of Localities 10 and 11, Ojo Encino A r e a .....................................................................................................44 15. Magnetic Correlation of Localities 10 and 11, Ojo Encino A r e a .....................................................................................................54 16. Magnetic-Polarity Stratigraphy of the Ojo Encino Area .................... 55 17. Magnetic-Polarity Stratigraphy of the Big Pocket Area .................... 58 vi v l i LIST OF ILLUSTRATIONS-Continued Figure Page 18. Geochronological Correlation of the Ojo Encino and Big Pocket A r e a s ................................................................................................ 61 19. Correlation of Revised Cenozoic Polarity Time Scale and Barrel Spring Arroyo Section .......................................... 66 LIST OF TABLES Table Page 1. H ierarchy o f Paleomagnetic S ite s ................................................................ 27 2. Faunal List for the Ojo Encino and Big Pocket Study A r e a s ..................................................................................................... 46 viii ABSTRACT This study compares two areas o f the San Juan Basin w ith respect to biostratigraphy, lithostratigraphy, and magnetic-polarity stratigraphy. The Ojo Encino Area, near Cuba, New Mexico and the Big Pocket Area of Kutz Canyon, near Bloomfield, New Mexico were collected for vertebrate fossils and magnetic samples. Both study areas contained fossils of Torrejonian Land Mammal Age. Within this age two collecting levels are recognized. The upper. Panto!ambda, level is characterized by the presence of Panto!ambda, Claenodon, and possib ly Mixodectes pungens and T o rre jo n ia w lls o n i. The lower, Deltatherium, level is characterized by the presence of D e lta th e riu m , T riis o d o n , Haploconus, Mixodectes m a la ris , and possib ly Palaechthon nacimientl. These collecting levels are also defined by their magnetic-polarity stratigraphy. Correlation of the two study areas demonstrates that the Panto!ambda level is from within a normal magnetozone and that the Deltatherium level is from within the under­ lying reversed magnetozone. Comparison of the magnetic-polarity stratigraphy from the two study areas with the polarity time scale demonstrates that the normal magnetozone containing the Panto!ambda level is either anomaly 26 or anomaly 27. ix CHAPTER 1 INTRODUCTION The San Juan Basin has
Load more

Recommended publications
  • Asian Paleocene-Early Eocene Chronology and Biotic Events
    ©Geol. Bundesanstalt, Wien; download unter www.geologie.ac.at Berichte Geol. B.-A., 85 (ISSN 1017-8880) – CBEP 2011, Salzburg, June 5th – 8th Asian Paleocene-Early Eocene Chronology and biotic events Suyin Ting1, Yongsheng Tong2, William C. Clyde3, Paul L.Koch4, Jin Meng5, Yuanqing Wang2, Gabriel J. Bowen6, Qian Li2, Snell E. Kathryn4 1 LSU Museum of Natural Science, Baton Rouge, LA 70803, USA 2 Institute of Vert. Paleont. & Paleoanth., CAS., Beijing 100044, China 3 University of New Hampshire, Durham, NH 03824, USA 4 University of California Santa Cruz, Santa Cruz, CA 95064, USA 5 American Museum of Natural History, New York, NY 10024, USA 6 Purdue University, West Lafayette, IN 47907, USA Biostratigraphic, chemostratigraphic, and magnetostratigraphic studies of the Paleocene and early Eocene strata in the Nanxiong Basin of Guangdong, Chijiang Basin of Jiangxi, Qianshan Basin of Anhui, Hengyang Basin of Hunan, and Erlian Basin of Inner Mongolia, China, in last ten years provide the first well-resolved geochronological constrains on stratigraphic framework for the early Paleogene of Asia. Asian Paleocene and early Eocene strata are subdivided into four biochronological units based on the fossil mammals (Land Mammal Ages). From oldest to youngest, they are the Shanghuan, the Nongshanian, the Gashatan, and the Bumbanian Asian Land Mammal Ages (ALMA). Recent paleomagnetic data from the Nanxiong Basin indicate that the base of the Shanghuan lies about 2/3 the way up Chron C29r. Nanxiong data and recent paleomagnetic and isotopic results from the Chijiang Basin show that the Shanghuan-Nongshanian ALMA boundary lies between the upper part of Chron C27n and the lower part of Chron C26r, close to the Chron C27n-C26r reversal.
    [Show full text]
  • A/L Hcan %Mlsdum
    A/LSoxfitateshcan %Mlsdum PUBLISHED BY THE AMERICAN MUSEUM OF NATURAL HISTORY CENTRAL PARK WEST AT 79TH STREET, NEW YORK 24, N.Y. NUMBER 1957 AUGUST 5, 1959 Fossil Mammals from the Type Area of the Puerco and Nacimiento Strata, Paleocene of New Mexico BY GEORGE GAYLORD SIMPSON ANTECEDENTS The first American Paleocene mammals and the first anywhere from the early to middle Paleocene were found in the San Juan Basin of New Mexico. Somewhat more complete sequences and larger faunas are now known from elsewhere, but the San Juan Basin strata and faunas are classical and are still the standard of comparison for the most clearly established lower (Puercan), middle (Torrejonian), and upper (Tiffanian) stages and ages. The first geologist to distinguish clearly what are now known to be Paleocene beds in the San Juan Basin was Cope in 1S74. He named them "Puercan marls" (Cope, 1875) on the basis of beds along the upper Rio Puerco, and especially of a section west of the Rio Puerco southwest of the then settlement of Nacimiento and of the present town of Cuba, on the southern side of Cuba Mesa. Cope reported no fossils other than petrified wood, but in 1880 and later his collector, David Baldwin, found rather abundant mammals, described by Cope (1881 and later) in beds 50 miles and more to the west and northwest of the type locality but referred to the same formation. In the 1890's Wortman collected for the American Museum in the Puerco of Cope, and, on the basis of this work, Matthew (1897) recognized the presence of two quite distinct faunas of different ages.
    [Show full text]
  • Notes on Paleocene and Lower Eocene Mammal Horizons of Northern New Mexico and Southern Colorado
    56.9(1181:78.9). Article XXXII.- NOTES ON PALEOCENE AND LOWER EOCENE MAMMAL HORIZONS OF NORTHERN NEW MEXICO AND SOUTHERN COLORADO. BY WALTER GRANGER. PLATES XCVII AND XCVIII. The purpose of the present short paper is to indicate some of the results of the Eocene exploration conducted by the writer, with the assistance of Mr. George Olsen, in the San Juan Basin in 1916. It is hoped that the fol- lowing notes may be of some aid to future Eocene collecting in this region and possibly also to detailed geologic plotting. Three separate localities were examined, viz.: the Torrejon of Angel Peak, lying south of the San Juan River; the Torrejon of the Animas Valley, between Aztec and Cedar Hill; a set of later beds in Colorado, lying north of the Denver and Rio Grande Railway, between Los Pifios and Piedra Rivers. The American Museum expedition of 1913 visited nearly all of the Paleocene localities of the San Juan Basin from which fossils had previously been obtained, made extensive collections and summarized the strati- graphic results in a paper published the following year.1 These localities are all on the south side of the San Juan River and extend in a long line from the vicinity of Ojo Alamo eastward to the Puerco River below Cuba. Exposures lying to the north near the San Juan and in the Animas Valley were known to be Paleocene but for lack of time were not examined that year. The Angel Peak Region. The exposures at Angel Peak are in the form of a gigantic crater cut out of a fairly level grass-covered plain to a depth of several hundred feet and with a diameter of three to four miles.
    [Show full text]
  • The Geologic History of Fossil Butte National Monument and Fossil Basin
    The Geologic History of Fossil Butte National Monument and Fossil Basin FOSSIL BUTTE The Geologic History of Fossil Butte National Monument and Fossil Basin NPS Occasional Paper No. 3 THE GEOLOGIC HISTORY OF FOSSIL BUTTE NATIONAL MONUMENT AND FOSSIL BASIN Paul O. McGrew Michael Casilliano Department of Geology, University of Wyoming National Park Service Occasional Paper Number Three 1975 TABLE OF CONTENTS index.htm Last Updated: 01-Mar-2005 http://www.nps.gov/history/history/online_books/fobu/index.htm[6/17/2013 12:42:49 PM] The Geologic History of Fossil Butte National Monument and Fossil Basin (Tables of Contents) FOSSIL BUTTE The Geologic History of Fossil Butte National Monument and Fossil Basin NPS Occasional Paper No. 3 CONTENTS COVER INTRODUCTION LOCATION HISTORICAL BACKGROUND OF RESEARCH STRATIGRAPHY Thaynes Limestone Evanston Formation Wasatch Formation Basal Conglomerate Member Lower Member Main Body Sandstone Tongue Mudstone Tongue Bullpen Member Tunp Member Age of the Wasatch Formation Depositional Environment Green River Formation Fossil Butte Member Angelo Member Age of the Green River Formation Depositional Environment Fowkes Formation Sillem Member Bulldog Hollow Member Gooseberry Member Age of the Fowkes Formation Depositional Environment QUATERNARY THE GEOLOGIC STRUCTURE OF FOSSIL BASIN PALEONTOLOGY Flora Invertebrates http://www.nps.gov/history/history/online_books/fobu/contents.htm[6/17/2013 12:42:58 PM] The Geologic History of Fossil Butte National Monument and Fossil Basin (Tables of Contents) Vertebrates Fish Amphibians Reptiles Birds Mammals PALEOECOLOGY AND TAPHONOMY ACKNOWLEDGMENTS GLOSSARY REFERENCES BIBLIOGRAPHY Library of Congress Cataloging in Publication Data McGrew, Paul Orman, 1909- The geological history of Fossil Butte National Monument and Fossil Basin.
    [Show full text]
  • VOLCANIC INFLUENCE OVER FLUVIAL SEDIMENTATION in the CRETACEOUS Mcdermott MEMBER, ANIMAS FORMATION, SOUTHWESTERN COLORADO
    VOLCANIC INFLUENCE OVER FLUVIAL SEDIMENTATION IN THE CRETACEOUS McDERMOTT MEMBER, ANIMAS FORMATION, SOUTHWESTERN COLORADO Colleen O’Shea A Thesis Submitted to the Graduate College of Bowling Green State University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August: 2009 Committee: James Evans, advisor Kurt Panter, co-advisor John Farver ii Abstract James Evans, advisor Volcanic processes during and after an eruption can impact adjacent fluvial systems by high influx rates of volcaniclastic sediment, drainage disruption, formation and failure of natural dams, changes in channel geometry and changes in channel pattern. Depending on the magnitude and frequency of disruptive events, the fluvial system might “recover” over a period of years or might change to some other morphology. The goal of this study is to evaluate the preservation potential of volcanic features in the fluvial environment and assess fluvial system recovery in a probable ancient analog of a fluvial-volcanic system. The McDermott Member is the lower member of the Late Cretaceous - Tertiary Animas Formation in SW Colorado. Field studies were based on a southwest-northeast transect of six measured sections near Durango, Colorado. In the field, 13 lithofacies have been identified including various types of sandstones, conglomerates, and mudrocks interbedded with lahars, mildly reworked tuff, and primary pyroclastic units. Subsequent microfacies analysis suggests the lahar lithofacies can be subdivided into three types based on clast composition and matrix color, this might indicate different volcanic sources or sequential changes in the volcanic center. In addition, microfacies analysis of the primary pyroclastic units suggests both surge and block-and-ash types are present.
    [Show full text]
  • Geologic History of the San Juan Basin Area, New Mexico and Colorado Edward C
    New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/1 Geologic history of the San Juan Basin area, New Mexico and Colorado Edward C. Beaumont and Charles B. Read, 1950, pp. 49-54 in: San Juan Basin (New Mexico and Colorado), Kelley, V. C.; Beaumont, E. C.; Silver, C.; [eds.], New Mexico Geological Society 1st Annual Fall Field Conference Guidebook, 152 p. This is one of many related papers that were included in the 1950 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.
    [Show full text]
  • Uppermost Cretaceous and Tertiary Stratigraphy of Fossil Basin, Southwestern Wyoming
    Uppermost Cretaceous and Tertiary Stratigraphy of Fossil Basin, Southwestern Wyoming By STEVEN S. ORIEL and JOSHUA I. TRACEY, JR. GEOLOGICAL SURVEY PROFESSIONAL PAPER 635 New subdivisions of the J,ooo-Joot-thick continental Evanston, Wasatch, Green River, and Fowkes Formations facilitate understanding of sediment genesis and Jl7yoming thrust-belt tectonic events UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON 1970 UNITED STATES DEPARTMENT OF THE INTERIOR WALTER J. HICKEL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director Library of Congress catalog-card No. 70-604646 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price 65 cents (paper cover) CONTENTS Page Wasatch Formation-Continued Abstract __________________________________________ _ 1 Fossils and age-Continued· Page Introduction ______________________________________ _ 2 Tunp Member______________________________ 28 Purpose ______________________________________ _ 2 Origin--------~-------------------------------- 28 Earlier work_ .. __ - __ - ___________________ - _-- _- __ 2 Tectonic implications ____________ -_-------------- 29 Acknowledgments __ . ___________________________ _ 2 Green River Formation ___ .. _______ ------------------ 30 General relations ___ -- _________________________ _ 5 Name and usage __________________ -------------- 30 Evanston Formation _______________________________ _ 5 Definition __________________ -_-------------- 30 N arne and usage _______________________________ _ 5 Lithologic heterogeneity.
    [Show full text]
  • Geology and Coal Resources of the Upper Cretaceous Fruitland Formation, San Juan Basin, New Mexico and Colorado
    Chapter Q National Coal Resource Geology and Coal Resources of the Assessment Upper Cretaceous Fruitland Formation, San Juan Basin, New Mexico and Colorado Click here to return to Disc 1 By James E. Fassett1 Volume Table of Contents Chapter Q of Geologic Assessment of Coal in the Colorado Plateau: Arizona, Colorado, New Mexico, and Utah Edited by M.A. Kirschbaum, L.N.R. Roberts, and L.R.H. Biewick U.S. Geological Survey Professional Paper 1625–B* 1 U.S. Geological Survey, Denver, Colorado 80225 * This report, although in the USGS Professional Paper series, is available only on CD-ROM and is not available separately U.S. Department of the Interior U.S. Geological Survey Contents Abstract........................................................................................................................................................Q1 Introduction ................................................................................................................................................... 2 Purpose and Scope ............................................................................................................................. 2 Location and Extent of Area............................................................................................................... 2 Earlier Investigations .......................................................................................................................... 2 Geography............................................................................................................................................
    [Show full text]
  • Mesozoic Stratigraphy at Durango, Colorado
    160 New Mexico Geological Society, 56th Field Conference Guidebook, Geology of the Chama Basin, 2005, p. 160-169. LUCAS AND HECKERT MESOZOIC STRATIGRAPHY AT DURANGO, COLORADO SPENCER G. LUCAS AND ANDREW B. HECKERT New Mexico Museum of Natural History and Science, 1801 Mountain Rd. NW, Albuquerque, NM 87104 ABSTRACT.—A nearly 3-km-thick section of Mesozoic sedimentary rocks is exposed at Durango, Colorado. This section con- sists of Upper Triassic, Middle-Upper Jurassic and Cretaceous strata that well record the geological history of southwestern Colorado during much of the Mesozoic. At Durango, Upper Triassic strata of the Chinle Group are ~ 300 m of red beds deposited in mostly fluvial paleoenvironments. Overlying Middle-Upper Jurassic strata of the San Rafael Group are ~ 300 m thick and consist of eolian sandstone, salina limestone and siltstone/sandstone deposited on an arid coastal plain. The Upper Jurassic Morrison Formation is ~ 187 m thick and consists of sandstone and mudstone deposited in fluvial environments. The only Lower Cretaceous strata at Durango are fluvial sandstone and conglomerate of the Burro Canyon Formation. Most of the overlying Upper Cretaceous section (Dakota, Mancos, Mesaverde, Lewis, Fruitland and Kirtland units) represents deposition in and along the western margin of the Western Interior seaway during Cenomanian-Campanian time. Volcaniclastic strata of the overlying McDermott Formation are the youngest Mesozoic strata at Durango. INTRODUCTION Durango, Colorado, sits in the Animas River Valley on the northern flank of the San Juan Basin and in the southern foothills of the San Juan and La Plata Mountains. Beginning at the northern end of the city, and extending to the southern end of town (from north of Animas City Mountain to just south of Smelter Moun- tain), the Animas River cuts in an essentially downdip direction through a homoclinal Mesozoic section of sedimentary rocks about 3 km thick (Figs.
    [Show full text]
  • Geology and Vertebrate Paleontology of Western and Southern North America
    OF WESTERN AND SOUTHERN NORTH AMERICA OF WESTERN AND SOUTHERN NORTH PALEONTOLOGY GEOLOGY AND VERTEBRATE Geology and Vertebrate Paleontology of Western and Southern North America Edited By Xiaoming Wang and Lawrence G. Barnes Contributions in Honor of David P. Whistler WANG | BARNES 900 Exposition Boulevard Los Angeles, California 90007 Natural History Museum of Los Angeles County Science Series 41 May 28, 2008 Paleocene primates from the Goler Formation of the Mojave Desert in California Donald L. Lofgren,1 James G. Honey,2 Malcolm C. McKenna,2,{,2 Robert L. Zondervan,3 and Erin E. Smith3 ABSTRACT. Recent collecting efforts in the Goler Formation in California’s Mojave Desert have yielded new records of turtles, rays, lizards, crocodilians, and mammals, including the primates Paromomys depressidens Gidley, 1923; Ignacius frugivorus Matthew and Granger, 1921; Plesiadapis cf. P. anceps; and Plesiadapis cf. P. churchilli. The species of Plesiadapis Gervais, 1877, indicate that Member 4b of the Goler Formation is Tiffanian. In correlation with Tiffanian (Ti) lineage zones, Plesiadapis cf. P. anceps indicates that the Laudate Discovery Site and Edentulous Jaw Site are Ti2–Ti3 and Plesiadapis cf. P. churchilli indicates that Primate Gulch is Ti4. The presence of Paromomys Gidley, 1923, at the Laudate Discovery Site suggests that the Goler Formation occurrence is the youngest known for the genus. Fossils from Member 3 and the lower part of Member 4 indicate a possible marine influence as Goler Formation sediments accumulated. On the basis of these specimens and a previously documented occurrence of marine invertebrates in Member 4d, the Goler Basin probably was in close proximity to the ocean throughout much of its existence.
    [Show full text]
  • Vertebrate Paleontology of the Cretaceous/Tertiary Transition of Big Bend National Park, Texas (Lancian, Puercan, Mammalia, Dinosauria, Paleomagnetism)
    Louisiana State University LSU Digital Commons LSU Historical Dissertations and Theses Graduate School 1986 Vertebrate Paleontology of the Cretaceous/Tertiary Transition of Big Bend National Park, Texas (Lancian, Puercan, Mammalia, Dinosauria, Paleomagnetism). Barbara R. Standhardt Louisiana State University and Agricultural & Mechanical College Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_disstheses Recommended Citation Standhardt, Barbara R., "Vertebrate Paleontology of the Cretaceous/Tertiary Transition of Big Bend National Park, Texas (Lancian, Puercan, Mammalia, Dinosauria, Paleomagnetism)." (1986). LSU Historical Dissertations and Theses. 4209. https://digitalcommons.lsu.edu/gradschool_disstheses/4209 This Dissertation is brought to you for free and open access by the Graduate School at LSU Digital Commons. It has been accepted for inclusion in LSU Historical Dissertations and Theses by an authorized administrator of LSU Digital Commons. For more information, please contact [email protected]. INFORMATION TO USERS This reproduction was made from a copy of a manuscript sent to us for publication and microfilming. While the most advanced technology has been used to pho­ tograph and reproduce this manuscript, the quality of the reproduction is heavily dependent upon the quality of the material submitted. Pages in any manuscript may have indistinct print. In all cases the best available copy has been filmed. The following explanation of techniques is provided to help clarify notations which may appear on this reproduction. 1. Manuscripts may not always be complete. When it is not possible to obtain missing pages, a note appears to indicate this. 2. When copyrighted materials are removed from the manuscript, a note ap­ pears to indicate this. 3.
    [Show full text]
  • Late Paleocene) of the Eastern Crazy Mountain Basin, Montana
    CONTRIBUTIONS FROM THE MUSEUM OF PALEONTOLOGY THE UNIVERSITY OF MICHIGAN VOL. 26, NO. 9, p. 157-196 December 3 1, 1983 MAMMALIAN FAUNA FROM DOUGLASS QUARRY, EARLIEST TIFFANIAN (LATE PALEOCENE) OF THE EASTERN CRAZY MOUNTAIN BASIN, MONTANA BY DAVID W. KRAUSE AND PHILIP D. GINGERICH MUSEUM OF PALEONTOLOGY THE UNIVERSITY OF MICHIGAN ANN ARBOR CONTRIBUTIONS FROM THE MUSEUM OF PALEONTOLOGY Philip D. Gingerich, Director Gerald R. Smith, Editor This series of contributions from the Museum of Paleontology is a medium for the publication of papers based chiefly upon the collection in the Museum. When the number of pages issued is sufficient to make a volume, a title page and a table of contents will be sent to libraries on the mailing list, and to individuals upon request. A list of the separate papers may also be obtained. Correspondence should be directed to the Museum of Paleontology, The University of Michigan, Ann Arbor, Michigan, 48 109. VOLS. 11-XXVI. Parts of volumes may be obtained if available. Price lists available upon inquiry. MAMMALIAN FAUNA FROM DOUGLASS QUARRY, EARLIEST TIFFANIAN (LATE PALEOCENE) OF THE EASTERN CRAZY MOUNTAIN BASIN, MONTANA BY David W. ~rause'and Philip D. ~in~erich' Abstract.-Douglass Quarry is the fourth major locality to yield fossil mammals in the eastern Crazy Mountain Basin of south-central Montana. It is stratigraphically intermediate between Gidley and Silberling quarries below, which are late Torrejonian (middle Paleocene) in age, and Scarritt Quarry above, which is early Tiffanian (late Paleocene) in age. The stratigraphic position of Douglass Quarry and the presence of primitive species of Plesiadapis, Nannodectes, Phenacodus, and Ectocion (genera first appearing at the Torrejonian-Tiffanian boundary) combine to indicate an earliest Tiffanian age.
    [Show full text]