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Geologic Framework of Pre-Cretaceous Rocks in the Southern Ute Indian Reservation and Adjacent Areas, Southwestern Colorado and Northwestern New Mexico

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Geologic Framework of Pre-Cretaceous Rocks in the Southern Ute Indian Reservation and Adjacent Areas, Southwestern Colorado and Northwestern New Mexico Z > 5*0 (T> O COVER PHOTOGRAPH Chief Buckskin Charley (circa 1840-1936) was the last hereditary chief of the Utes. He was named Chief of the Utes at the request of Chief Ouray, under whom he had served as sub-chief for many years. He is wearing an 1890 Benjamin Harrison peace medal, which was the last medal designed specifically for presentation to Indians. The photograph is from the Lisle Updyke Photo-Collection of Dr. Robert W. Delany and is reprinted by permission of Dr. Robert W. Delany and Jan Pettit. Geologic Framework of Pre-Cretaceous Rocks in the Southern Ute Indian Reservation and Adjacent Areas, Southwestern Colorado and Northwestern New Mexico By STEVEN M. CONDON GEOLOGY AND MINERAL RESOURCES OF THE SOUTHERN UTE INDIAN RESERVATION Edited by ROBERT S. ZECH U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1505-A Prepared in cooperation with the Southern Ute Tribe and the U.S. Bureau of Indian Affairs Stratigraphy and structure of Precambrian to Jurassic rocks of the Southern Ute Indian Reservation and adjacent areas UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1992 U.S. DEPARTMENT OF THE INTERIOR MANUEL LUJAN, JR., Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director Library of Congress Cataloging in Publication Data Condon, Steven M. Geologic framework of pre-Cretaceous rocks in the Southern Ute Indian Reservation and adjacent areas, southwestern Colorado and northwestern New Mexico / by Steven M. Condon. p. cm. (Geology and mineral resources of the Southern Ute Indian Reservation ; ch.) (U.S. Geological Survey professional paper ; 1505-A) "Prepared in cooperation with the Southern Ute Indian Tribe and the U.S. Bureau of Indian Affairs." Includes bibliographical references (p. ). Supt. of Docs, no.: I 19.16: 1505-A 1. Geology Colorado Southern Ute Indian Reservation. 2. Geology, Stratigraphic. 3. Southern Ute Indian Reser­ vation. I. Southern Ute Tribe. II. United States. Bureau of Indian Affairs. III. Title. IV. Series. V. Series: U.S. Geological Survey professional; 1505-A. TN24.C6C46 [QE91] 553'.09788'29 s dc20 91-30873 [551.7'009788'29] CIP For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Federal Center, Box 25425, Denver, CO 80225 PREFACE At the request of the Southern Ute Tribe and the Energy and Mineral Division of the U.S. Bureau of Indian Affairs, the U.S. Geological Survey began a program in 1984 to study the geology and mineral resources of the Southern Ute Indian Reservation. The objective is to develop a series of investigations that characterize the geology and structure of the Reservation and that address a variety of resource-related problems. The boundary of the area covered by each investigation is determined by the nature of the specific investigation and accordingly may include only topical areas within the Res­ ervation or the entire Reservation and adjacent areas. The U.S. Geological Survey received valuable information and contributions from the Southern Ute Energy Department, without which these investiga­ tions would not have been possible. The final interpretive results of each investigation are presented as chapters of U.S. Geological Survey Professional Paper 1505. The chapters will be published as the interpretive products of the investigations become available. Robert S. Zech Editor m CONTENTS Page Page Stratigraphy Continued Abstract........................................................................................ Al Permian rocks....................................................................... A30 Introduction.................................................................................. 2 Cutler Formation, undivided........................................ 30 Previous investigations............................................................... 6 Cutler Group.................................................................. 30 Methods........................................................................................ 6 Halgaito Formation................................................ 30 Cedar Mesa Sandstone.......................................... 33 Stratigraphy................................................................................. 8 Organ Rock Formation.......................................... 33 Precambrian crystalline and metamorphic rocks .............. 8 De Chelly Sandstone.............................................. 33 Cambrian rocks..................................................................... 8 Triassic rocks........................................................................ 33 Ignacio Quartzite........................................................... 8 Dolores Formation.................................................. 33 Ordovician and Silurian rocks............................................. 13 Jurassic rocks....................................................................... 39 Devonian rocks ..................................................................... 15 Glen Canyon Group....................................................... 39 Elbert Formation........................................................... 15 Entrada Sandstone........................................................ 39 McCracken Sandstone Member ............................ 15 Dewey Bridge Member........................................... 39 Upper member........................................................ 15 Slick Rock Member ................................................ 42 Ouray Limestone........................................................... 18 Wanakah Formation..................................................... 42 Mississippian rocks .............................................................. 18 Todilto Limestone Member and equivalent Leadville Limestone...................................................... 18 rocks............................................................. 42 Pennsylvanian rocks............................................................. 18 Beclabito Member and equivalent rocks .............. 42 Molas Formation........................................................... 22 Horse Mesa Member and equivalent rocks.......... 42 Coalbank Hill Member........................................... 22 Junction Creek Sandstone............................................ 45 Middle member....................................................... 22 Morrison Formation...................................................... 45 Upper member........................................................ 22 Salt Wash Member................................................. 45 Hermosa Group............................................................. 23 Recapture Member................................................. 45 Pinkerton Trail Formation.................................... 25 Westwater Canyon Member.................................. 49 Paradox Formation and equivalent rocks ............ 25 Brushy Basin Member........................................... 49 Honaker Trail Formation...................................... 28 Geologic history............................................................................ 49 Pennsylvanian and Permian rocks...................................... 28 Summary...................................................................................... 53 Rico Formation.............................................................. 28 References cited........................................................................... 53 ILLUSTRATIONS Page PLATE 1. Geologic and structure contour map of the Southern Ute Indian Reservation and adjacent areas, southwestern Colorado and northwestern New Mexico ........................................................................................................................ In pocket FIGURE 1. Index map of the Southern Ute Indian Reservation and adjacent areas............................................................................. A3 2. Structure contour map drawn on the top of the Jurassic Morrison Formation .................................................................. 4 3. Time-stratigraphic chart of stratigraphic units on the Southern Ute Reservation and adjacent areas............................ 5 4. Map showing location of drill holes and outcrop measured sections that were used to construct the isopach maps and structure contour map.............................................................................................................................................................. 7 VI CONTENTS FIGURE 5-31. Isopach maps of the: 5. Ignacio Quartzite............................................................................................................................................................... A14 6. McCracken Sandstone Member of the Elbert Formation ............................................................................................. 16 7. Upper member of the Elbert Formation.......................................................................................................................... 17 8. Ouray Limestone............................................................................................................................................................... 19 9. Leadville Limestone .......................................................................................................................................................... 20 10. Molas Formation ..............................................................................................................................................................
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