DOCSLIB.ORG

Uranium in the Gunnison County, Colorado Craig S

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Uranium in the Gunnison County, Colorado Craig S New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/32 Uranium in the Gunnison County, Colorado Craig S. Goodknight, 1981, pp. 183-190 in: Western Slope (Western Colorado), Epis, R. C.; Callender, J. F.; [eds.], New Mexico Geological Society 32nd Annual Fall Field Conference Guidebook, 337 p. This is one of many related papers that were included in the 1981 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. Non-members will have access to guidebook papers two years after publication. Members 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 our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, 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. No material from the NMGS website, or printed and electronic publications, may be reprinted or redistributed without NMGS permission. Contact us for permission to reprint portions of any of our publications. One printed copy of any materials from the NMGS 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 explicit permission. This page is intentionally left blank to maintain order of facing pages. New Mexico Geological Society Guidebook, 32nd Field Conference, Western Slope Colorado, 1981 183 URANIUM IN THE GUNNISON COUNTRY, COLORADO* CRAIG S. GOODKNIGHT Bendix Field Engineering Corporation P.O. Box 1569 Grand Junction, Colorado 81502 INTRODUCTION rences are in pegmatites and shear zones in Precambrian rocks, Uranium prospecting spread eastward from the Colorado Pla- Cambrian vein material, and sandstones of early Tertiary age. teau in the middle and late 1950s to a more hard-rock environ- Much of the information and basic data on the various uranium ment in the area surrounding Gunnison. Two major uranium dis- occurrences for this paper were collected from 1977-1979 during tricts (Cochetopa and Marshall Pass) were discovered during that the evaluation of the Montrose (1°x2°) quadrangle by Bendix time, as were numerous uranium occurrences elsewhere in the Field Engineering Corporation, under contract to the U.S. Depart- area. More recently, in the late 1970s, the Gunnison country ex- ment of Energy for the National Uranium Resource Evaluation perienced renewed and more intense uranium exploration and (NURE) program. The reader is referred to the Montrose quadran- development. gle evaluation report (folio) for additional information on uranium Approximately 1.2 million kg of L.1308 have been produced from occurrences (many others having less than 0.01 percent U308) and the Gunnison country; over 99 percent of this has come from the favorability (Goodknight and Ludlam, 1981). Cochetopa and Marshall Pass districts. Uranium in both districts The area of Gunnison country for this paper is somewhat re- and many of the other occurrences is associated closely with fault stricted to within the Montrose 1°x2° quadrangle boundary, and and shear zones which cut brittle host formations (dolomites and also excludes the area around Lake City; the boundary of the area sandstones) of Paleozoic and Mesozoic age. Minor uranium occur- described in this paper is shown in Figure 1. An index map (fig. 1) shows all the known occurrences of material containing at least *Publication authorized by the U.S. Department of Energy, Grand Junction Office. 0.01 percent U308. 184 GOODKNIGHT DESCRIPTION OF URANIUM OCCURRENCES IN AREAS developed stream channel systems that trend west or northwest. (OR DISTRICTS) Samples of mineralized rock taken during quadrangle evaluation Ruby-Irwin District contain up to 0.035 percent U308; no uranium minerals have been Uranium has been found in the southeastern part of the Piceance identified. Creek basin in the Ruby-Irwin base- and precious-metal mining The uranium occurrence at the Standard mine is in gray, fine- district. In this district, centered about 10 km west of Crested grained sandstone with clay and carbonaceous clasts, probably Butte, uranium is in the Ruby Anthracite Creek area and at the from a fluvial channel. A sample of radioactive material taken dur- Standard mine. Prospectors in the mid-1950s found uranium in the ing quadrangle evaluation from the mine dump contained 0.59 lower part of the Eocene Wasatch Formation along Ruby Anthra- percent U308 and uranium (uraninite?) is associated with car- cite Creek at the Yellowdog and Pearl B claims (locality 1, fig. 1 and bonaceous material which composes about two percent of the Table 1). Workings on the claims in the E1/2 sec. 4, T. 14S., R. 87W. rock. The mine is within the body of base-metal mineralization consist of several prospect pits and one short adit; no uranium was related to the Redwell Basin intrusive complex of Oligocene age, produced. During quadrangle evaluation (Goodknight and Ludlam, centered about 2-3 km to the east. Uranium was probably em- 1981) in 1978, high radioactivity was found in some dump material placed by groundwaters in the carbonaceous sandstone before from the abandoned Standard mine in the SE% sec. 25, T. 13 S., R. the episode of base-metal mineralization which provided pyrite, 87 W. (loc. 2). The anomalously radioactive dump material came sphalerite, argentiferous galena, chalcopyrite, and pyrrhotite. from the Paleocene Ohio Creek Formation and/or the Eocene Wasatch Formation; the exact location of the material was uncer- Elk Mountains tain because the entrance to the mine (formerly a large producer The part of the Elk Mountains shown in Figure 1 extends from of lead, zinc, and silver) was caved. Gothic on the west to the Taylor River on the south and east. Four Uranium mineralization in the Ruby Anthracite Creek area is in areas of uranium cocurrences have been found in this (southern) iron-stained, fine- to medium-grained feldspathic sandstone that part of the Elk Mountains. contains a moderate amount (up to several percent) of carbona- On the west side of Virginia Basin about 2.5 km north of Gothic ceous material and minor pyrite along bedding. Uranium is associ- in the NW% NE% sec. 34, T. 12 S., R. 86W. (loc. 3), low-grade strati- ated with carbonaceous material, mainly near the base of poorly form uranium enrichment occurs in a thin, gray, freshwater lime- URANIUM IN THE GUNNISON COUNTRY 185 stone bed in the lower part of the Morrison Formation. This oc- small, widely scattered pods of uranium-bearing minerals. The sim- currence was discovered in the mid-1950s and was investigated in ple and zoned pegmatites in the district are related to the Wood 1978 by Goodknight and Ludlam (1981). A sample from the lime- Gulch Granite of Precambrian X age exposed to the south. stone bed contained 0.01 percent U308; the highest radioactivity Pegmatite No. 783, named on the map by Staatz and Trites was along fractures or joint surfaces. The occurrence is probably (1955), was sampled by Goodknight and Ludlam (1981) in 1979 epigenetic and may be either an efflorescent or a peneconcordant and found to contain the thorium minerals brockite and greyite deposit. and 0.011 percent L.1308; no uranium minerals were identified. This Near the head of Cement Creek on the north side of Mt. Tilton in microcline-quartz-pegmatite is in the E1/2 sec. 32, T. 50 N., R. 3 E. the SPA sec. 28, T. 12 S., R. 84W. (loc. 4), another low-grade strati- (loc. 7). form uranium enrichment occurs—this time in the lowr part of the The Brown Derby mine in the NE% sec. 3, T. 49 N., R. 3 E. (loc. 8) Parting Sandstone of the Chaffee Group. This occurrence was produced about 110 kg of U308 from 365 metric tons of lepidolite found in 1978 during quadrangle evaluation (Goodknight and Lud- and microlite mined during World War II (Nelson-Moore and lam, 1981); a sample of the Parting contained 0.017 percent radio- others, 1978). Chip samples taken during quadrangle evaluation in metric uranium. High radioactivity occurs in a thin bed of dark 1978 from the margin of the Brown Derby No. 1 pegmatite con- brown, quartzose, medium- to fine-grained sandstone in the Part- tained several percent U308 from the minerals pyrochlore and ing, which represents a marginal-marine environment during trans- uranopyrochlore. gression of a sea in Late Devonian time. A sample taken during quadrangle evaluation in 1978 from a ra- On the south side of Star Basin near the head of Italian Creek in dioactive part of the Bucky pegmatite at the Willow Creek mine secs. 1 and 12, T. 13 S., R. 84 W. are three closely-separated (loc. 9) contained 0.084 percent U308. This mine is near the north- uranium occurrences (all shown by loc. 5, fig. 1). All three oc- ern end of the district in the NE1/4 sec.
Load more

Recommended publications
  • Profiles of Colorado Roadless Areas
    PROFILES OF COLORADO ROADLESS AREAS Prepared by the USDA Forest Service, Rocky Mountain Region July 23, 2008 INTENTIONALLY LEFT BLANK 2 3 TABLE OF CONTENTS ARAPAHO-ROOSEVELT NATIONAL FOREST ......................................................................................................10 Bard Creek (23,000 acres) .......................................................................................................................................10 Byers Peak (10,200 acres)........................................................................................................................................12 Cache la Poudre Adjacent Area (3,200 acres)..........................................................................................................13 Cherokee Park (7,600 acres) ....................................................................................................................................14 Comanche Peak Adjacent Areas A - H (45,200 acres).............................................................................................15 Copper Mountain (13,500 acres) .............................................................................................................................19 Crosier Mountain (7,200 acres) ...............................................................................................................................20 Gold Run (6,600 acres) ............................................................................................................................................21
    [Show full text]
  • The Geologic Story of Colorado's Sangre De Cristo Range
    The Geologic Story of Colorado’s Sangre de Cristo Range Circular 1349 U.S. Department of the Interior U.S. Geological Survey Cover shows a landscape carved by glaciers. Front cover, Crestone Peak on left and the three summits of Kit Carson Mountain on right. Back cover, Humboldt Peak on left and Crestone Needle on right. Photograph by the author looking south from Mt. Adams. The Geologic Story of Colorado’s Sangre de Cristo Range By David A. Lindsey A description of the rocks and landscapes of the Sangre de Cristo Range and the forces that formed them. Circular 1349 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director U.S. Geological Survey, Reston, Virginia: 2010 This and other USGS information products are available at http://store.usgs.gov/ U.S. Geological Survey Box 25286, Denver Federal Center Denver, CO 80225 To learn about the USGS and its information products visit http://www.usgs.gov/ 1-888-ASK-USGS Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Lindsey, D.A., 2010, The geologic story of Colorado’s Sangre de Cristo Range: U.S. Geological Survey Circular 1349, 14 p. iii Contents The Oldest Rocks ...........................................................................................................................................1
    [Show full text]
  • The Need for Sedimentary Geology in Paleontology
    The Sedimentary Record The Habitat of Primitive Vertebrates: The Need for Sedimentary Geology in Paleontology Steven M. Holland Department of Geology, The University of Georgia, Athens, GA 30602-2501 Jessica Allen Department of Geology and Geophysics, The University of Utah, Salt Lake City, UT 84112-0111 ABSTRACT That these were fish fossils was immediately controversial, with paleontological giants E.D. Cope and E.W. Claypole voicing The habitat in which early fish originated and diversified has doubts. long been controversial, with arguments spanning everything The controversy over habitat soon followed. By 1935, a fresh- from marine to fresh-water. A recent sequence stratigraphic water or possibly estuarine environment for early fish was generally analysis of the Ordovician Harding Formation of central preferred, but essentially in disregard for the sedimentology of the Colorado demonstrates that the primitive fish first described by Harding (Romer and Grove, 1935). Devonian fish were abundant Charles Walcott did indeed live in a shallow marine in fresh-water strata and the lack of fish in demonstrably marine environment, as he argued.This study underscores the need for Ordovician strata supported a fresh-water origin. The abrasion of analyses of the depositional environment and sequence dermal plates in the Harding was considered proof that the fish architecture of fossiliferous deposits to guide paleobiological and were transported from a fresh-water habitat to their burial in a biostratigraphic inferences. littoral environment. The fresh-water interpretation quickly led to paleobiological inference, as armored heads were thought to be a defense against eurypterids living in fresh-water habitats. Paleobiological inference also drove the fresh-water interpretation, INTRODUCTION with biologists arguing that the physiology of kidneys necessitated a For many years, the habitat of primitive vertebrates has been fresh-water origin for fish.
    [Show full text]
  • Exceptional Fossil Preservation During CO2 Greenhouse Crises? Gregory J
    Palaeogeography, Palaeoclimatology, Palaeoecology 307 (2011) 59–74 Contents lists available at ScienceDirect Palaeogeography, Palaeoclimatology, Palaeoecology journal homepage: www.elsevier.com/locate/palaeo Exceptional fossil preservation during CO2 greenhouse crises? Gregory J. Retallack Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403, USA article info abstract Article history: Exceptional fossil preservation may require not only exceptional places, but exceptional times, as demonstrated Received 27 October 2010 here by two distinct types of analysis. First, irregular stratigraphic spacing of horizons yielding articulated Triassic Received in revised form 19 April 2011 fishes and Cambrian trilobites is highly correlated in sequences in different parts of the world, as if there were Accepted 21 April 2011 short temporal intervals of exceptional preservation globally. Second, compilations of ages of well-dated fossil Available online 30 April 2011 localities show spikes of abundance which coincide with stage boundaries, mass extinctions, oceanic anoxic events, carbon isotope anomalies, spikes of high atmospheric carbon dioxide, and transient warm-wet Keywords: Lagerstatten paleoclimates. Exceptional fossil preservation may have been promoted during unusual times, comparable with fi Fossil preservation the present: CO2 greenhouse crises of expanding marine dead zones, oceanic acidi cation, coral bleaching, Trilobite wetland eutrophication, sea level rise, ice-cap melting, and biotic invasions. Fish © 2011 Elsevier B.V. All rights reserved. Carbon dioxide Greenhouse 1. Introduction Zeigler, 1992), sperm (Nishida et al., 2003), nuclei (Gould, 1971)and starch granules (Baxter, 1964). Taphonomic studies of such fossils have Commercial fossil collectors continue to produce beautifully pre- emphasized special places where fossils are exceptionally preserved pared, fully articulated, complex fossils of scientific(Simmons et al., (Martin, 1999; Bottjer et al., 2002).
    [Show full text]
  • What May Be Seen Crossing the Rockies En Route Between Ogden
    University of California Berkeley WHAT MAY BE SEEN EN ROUTE BETWEEN OGDEN, SALT LAKE CITY AND DENVER ON THE LINE OF The Denver & Rio Grande System E. T. JEFFERY, PRESIDENT, .... NEW YORK. C. H. SCHLACKS, VICE-PRESIDENT, . DENVER, COLO. A. C. BIRD, VICE-PRESIDENT, .... CHICAGO, ILL. A. S. HUGHES, GENERAL TRAFFIC MANAGER . DENVER, COLO. F. A. WADLEIGH, Ass'T GEN-L PASS-R AGENT, . DENVER, COLO. S, K. HOOPER, Gen'l Passenger and Ticket Agent, Denver, Colo. COPYRIGHT BY S. K. HOOPER. 19O5. if COMPARATIVE CUT DESERET vs. CANAAN. A striking comparison between the Holy Land and the new State of Utah, aptly termed the " Mountain Walled Treasury of the Gods." POOLE BROS. CHICAGO. HO EN ROUTE Rio Grande Western Railway "Great Salt Lake Route." The object of this book is to supply our patrons with information generally desired by travelers regarding their routes, and to do it in a brief, business- like way, leaving the flights of fancy to builders of "Castles in Spain." Western terminus, Denver & Rio Grande System. Second city in Utah. Nine miles from the Great Salt Lake, at the base of the Wasatch Mountains. Surrounded by immensely rich agricultural and mineral re- Ogden sources. Railroad center of Utah - Denver & Rio Grande, Suthern Pacific, Oregon Short Line & Utah Northern, Union Pacific. Second largest electrical power plant in the United States. Beet sugar factory. Destined to be an important manufacturing center. Ogden Hot Springs four miles. Growing sanitarium. Leaving Union Depot, you cross Ogden River in the city limits flows into Great Salt Lake. Roy From Ogden to Salt Lake City the Alt.
    [Show full text]
  • Geology and Mineral Deposits of the Poncha Springs NE Quadrangle, Chaffee County,Colorado
    Geology and Mineral Deposits of the Poncha Springs NE Quadrangle, Chaffee County,Colorado By RALPH E. VAN ALSTINE With a section on Fluorspar Mines and Prospects By RALPH E. VAN ALSTINE and DOAK C. COX GEOLOGICAL SURVEY PROFESSIONAL PAPER 626 Prepared in cooperation with the Colorado State Mining Industrial Development Board UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1969 UNITED STATES DEPARTMENT OF THE INTERIOR WALTER J. HICKEL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director Library of Congress catalog-card: No. 70-602625 For sale by the Superintendent of Docume!lts, U:S. Government Printing Office Washington, "D.C. 20402 o/\ 7 2 3 6 56 3 0 9 -, CONTENTS Page Page Abstract __________________________________________ _ 1 Economic geology----- ________ ---------------------- 30 Introduction ______________________________________ _ 2 Fluorspar deposits _________ ---------------------- 30 Earlier reports _________________________________ _ 2 History of production and ownership _____ -_-_- 30 Field and laboratory work _____________________ _ 2 Localization and structure_- __ -- ___ ---------- 30 Acknowledgments ______________________________ _ 4 Mineralogy _______________________ --------- :n Settlement and climate _________________________ _ 4 Paragenesis __________ ----------_----------- 34 Terrain _______________________________________ _ 4 Wallrock alteration _________________ --_---_- 34 Geologic units _____________________________________ ·- 4 Associated thermal · fluoride waters and the solubility of CaF2- _______
    [Show full text]
  • Table 12A-01-01. South Park Stratigraphic Chart
    South Park Basin Hydrogeologic Geologic Period Phase Stratigraphic Unit Unit Modern Alluvium and outwash deposits Alluvial Aquifer Glacial deposits Glacial deposits Quaternary Glaciation Older stream and outwash terrace Local perched deposits aquifer Neogene Wagontongue/ Extension Wagontongue/ Trump formations Trump Aquifer Antero Formation Antero Aquifer Thirtynine Mile Volcanics Volcanics Tallahassee Creek Tallahassee Creek Conglomerate Transition Aquifer Wall Mountain Tuff and Buffalo Peaks Volcanics volcanics Crystalline Paleogene intrusive rocks bedrock Paleogene Echo Park Alluvium Echo Park Aquifer Upper South Park Arkosic Member Aquifer Link Spring Link Spring Tuff Member confining unit Laramide Lower South Park Conglomerate Member Aquifer South Park Formation South Reinecker Ridge Volcanic Volcanics Member Paleogene and Cretaceous intrusive Crystalline rocks bedrock Laramie confining Upper unit Laramie Laramie Lower Formation Laramie- Fox Hills Fox Hills Sandstone Aquifer Pierre Shale Cretaceous Smoky Hill Member Interior Seaway Fort Hayes Limestone Niobrara Niobrara Pierre confining Formation unit Carlile Shale Greenhorn Limestone Graneros Shale Benton Group Benton Dakota Sandstone Dakota Aquifer Morrison Formation Morrison Aquifer Jurassic Mesozoic Sandstones Garo Sandstone Garo Aquifer Triassic No strata Permian Maroon Formation Maroon-Minturn Aquifer Upper member Ancestral Eagle Valley Evaporite facies Rocky evaporite unit Mountains Pennsylvanian Lower member- Minturn Aquifer Minturn Formation Minturn Coffman Member Belden
    [Show full text]
  • Structural Evolution of the Oil Well Flats Detachment System, Cañon City Embayment, Colorado
    STRUCTURAL EVOLUTION OF THE OIL WELL FLATS DETACHMENT SYSTEM, CAÑON CITY EMBAYMENT, COLORADO by Lauren C. Cross A thesis submitted to the Faculty and Board of Trustees of the Colorado School of Mines in partial fulillment of the requirements for the degree of Master of Science (Geology). Golden, Colorado Date ________________ Signed: _______________________ Lauren Cross Signed: _______________________ Dr. Bruce D. Trudgill Thesis Advisor Golden, Colorado Date ________________ Signed: _______________________ Dr. Paul Santi Professor and Head of Department of Geology and Geological Engineering ii ABSTRACT The Cañon City Embayment, located at the southern end of the Denver Basin, Colorado, is an understudied area with a complex structural history affected by major tectonic events such as the Ancestral Rocky Mountain Orogeny, Laramide Orogeny, regional epeirogenic uplift events, and Cenozoic extension. This area is of interest to the petroleum industry in part due to its proximity to Florence-Cañon City Oil Field, which produces from shallow, heavily fractured Pierre Shale and is the oldest continuously working oil ield in the United States. Detailed ield mapping identiied a ~3 km2 detachment fault system in the Oil Well Flats area, located in the northern part of the Cañon City Embayment, which is currently mapped as Quaternary alluvium and landslide deposits. The structure exhibits several topographically high, repeating blocks of Cretaceous Dakota Group sandstones, separated by topographically low valleys that are likely underlain by shale,
    [Show full text]
  • Retallack 2011 Lagerstatten
    This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier’s archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright Author's personal copy Palaeogeography, Palaeoclimatology, Palaeoecology 307 (2011) 59–74 Contents lists available at ScienceDirect Palaeogeography, Palaeoclimatology, Palaeoecology journal homepage: www.elsevier.com/locate/palaeo Exceptional fossil preservation during CO2 greenhouse crises? Gregory J. Retallack Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403, USA article info abstract Article history: Exceptional fossil preservation may require not only exceptional places, but exceptional times, as demonstrated Received 27 October 2010 here by two distinct types of analysis. First, irregular stratigraphic spacing of horizons yielding articulated Triassic Received in revised form 19 April 2011 fishes and Cambrian trilobites is highly correlated in sequences in different parts of the world, as if there were Accepted 21 April 2011 short temporal intervals of exceptional preservation globally. Second, compilations of ages of well-dated fossil Available online 30 April 2011 localities show spikes of abundance which coincide with stage boundaries, mass extinctions, oceanic anoxic events, carbon isotope anomalies, spikes of high atmospheric carbon dioxide, and transient warm-wet Keywords: Lagerstatten paleoclimates.
    [Show full text]
  • Sequence Stratigraphy and Depositional Environments Of
    SEQUENCE STRATIGRAPHY AND DEPOSITIONAL ENVIRONMENTS OF THE HARDING SANDSTONE, CENTRAL COLORADO: IMPLICATIONS FOR THE HABITAT OF EARLY FISH by JESSICA LYNN ALLEN (Under the Direction of Steven M. Holland) ABSTRACT Sixteen outcrops throughout the Cañon City Embayment and surrounding areas in Colorado were stratigraphically described to conclude that two ancient genera of fish, Astraspis desiderata and Eriptychius americanus, inhabited a low wave energy microtidal shallow marine environment. Debated for over a century, the habitat of these fish has been previously interpreted as fluvial, estuarine and marine. The facies interpretation and sequence stratigraphic analysis presented here provide new understanding to the ongoing debate. The Harding is interpreted here as mostly shoreface facies interrupted with an interval of lagoonal associated facies in the Cañon City area. Low wave energy conditions near the shore allowed extensive burrowing by organisms in the sediment that resulted in the pervasive bioturbation and lack of sedimentary structures. Fish remains are most commonly preserved on flooding surfaces either overlying or underlying shoreface facies and are associated with minor condensed intervals. INDEX WORDS: Harding Sandstone, Middle Ordovician, sequence stratigraphy, Astraspis desiderata, low wave energy microtidal shoreline SEQUENCE STRATIGRAPHY AND DEPOSITIONAL ENVIRONMENTS OF THE HARDING SANDSTONE, CENTRAL COLORADO: IMPLICATIONS FOR THE HABITAT OF EARLY FISH by JESSICA LYNN ALLEN B.A., University of Pennsylvania, 2001 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 2003 © 2003 Jessica Lynn Allen All Rights Reserved SEQUENCE STRATIGRAPHY AND DEPOSITIONAL ENVIRONMENTS OF THE HARDING SANDSTONE, CENTRAL COLORADO: IMPLICATIONS FOR THE HABITAT OF EARLY FISH by JESSICA LYNN ALLEN Major Professor: Steven M.
    [Show full text]
  • Synoptic Taxonomy of Major Fossil Groups
    APPENDIX Synoptic Taxonomy of Major Fossil Groups Important fossil taxa are listed down to the lowest practical taxonomic level; in most cases, this will be the ordinal or subordinallevel. Abbreviated stratigraphic units in parentheses (e.g., UCamb-Ree) indicate maximum range known for the group; units followed by question marks are isolated occurrences followed generally by an interval with no known representatives. Taxa with ranges to "Ree" are extant. Data are extracted principally from Harland et al. (1967), Moore et al. (1956 et seq.), Sepkoski (1982), Romer (1966), Colbert (1980), Moy-Thomas and Miles (1971), Taylor (1981), and Brasier (1980). KINGDOM MONERA Class Ciliata (cont.) Order Spirotrichia (Tintinnida) (UOrd-Rec) DIVISION CYANOPHYTA ?Class [mertae sedis Order Chitinozoa (Proterozoic?, LOrd-UDev) Class Cyanophyceae Class Actinopoda Order Chroococcales (Archean-Rec) Subclass Radiolaria Order Nostocales (Archean-Ree) Order Polycystina Order Spongiostromales (Archean-Ree) Suborder Spumellaria (MCamb-Rec) Order Stigonematales (LDev-Rec) Suborder Nasselaria (Dev-Ree) Three minor orders KINGDOM ANIMALIA KINGDOM PROTISTA PHYLUM PORIFERA PHYLUM PROTOZOA Class Hexactinellida Order Amphidiscophora (Miss-Ree) Class Rhizopodea Order Hexactinosida (MTrias-Rec) Order Foraminiferida* Order Lyssacinosida (LCamb-Rec) Suborder Allogromiina (UCamb-Ree) Order Lychniscosida (UTrias-Rec) Suborder Textulariina (LCamb-Ree) Class Demospongia Suborder Fusulinina (Ord-Perm) Order Monaxonida (MCamb-Ree) Suborder Miliolina (Sil-Ree) Order Lithistida
    [Show full text]
  • Pennsylvanian Stratigraphy of the Colorado Springs Quadrangle, Colorado
    Louisiana State University LSU Digital Commons LSU Historical Dissertations and Theses Graduate School 1947 Pennsylvanian Stratigraphy of the Colorado Springs Quadrangle, Colorado. Kenneth Phelps Mclaughlin Louisiana State University and Agricultural & Mechanical College Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_disstheses Part of the Earth Sciences Commons Recommended Citation Mclaughlin, Kenneth Phelps, "Pennsylvanian Stratigraphy of the Colorado Springs Quadrangle, Colorado." (1947). LSU Historical Dissertations and Theses. 7899. https://digitalcommons.lsu.edu/gradschool_disstheses/7899 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]. MANUSCRIPT THESES Unpublished theses submitted for the master's and doctor's degrees and deposited in the Louisiana State University Library are available for inspection. Use of any thesis is limited by the rights of the author. Bibliographical references may be noted3 but passages may not be copied unless the author has given permission# Credit must be given in subsequent written or published work# A library which borrows this thesis for use by its clientele is expected to make sure that the borrower is aware of the above restrictions, LOUISIANA STATE UNIVERSITY LIBRARY 119-a PENN3YLVAHIAN STRATIGRAPHY OF THE COLORADO SFRIN3S Q U A D R A T E , COLORADO A Dissertation Submitted to the Graduate Faculty of the Louisiana State University and Agricultural and Mechanicg ! College in partial fulfillment of the requirements for the degree of Doctor of Philosophy in The School of Geology by Kenneth Phelps McLaughlin B«A«, University of Missouri, 1939 M.A., University of Missouri, 1941 May, 1947 UMI Number: DP69277 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted.
    [Show full text]