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U.S. Geological Survey Bulletin 2121-A Availability of Books and Maps of the U.S

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U.S. Geological Survey Bulletin 2121-A Availability of Books and Maps of the U.S Table Mountain Quartzite and Moose Formation (new names) and Associated Rocks of the Middle Proterozoic Belt Supergroup, Highland Mountains, Southwestern Montana U.S. GEOLOGICAL SURVEY BULLETIN 2121-A AVAILABILITY OF BOOKS AND MAPS OF THE U.S. GEOLOGICAL SURVEY Instructions on ordering publications of the U.S. Geological Survey, along with prices of the last offerings, are given in the current-year issues of the monthly catalog "New Publications of the U.S. Geological Survey." Prices of available U.S. Geological Survey publications re­ leased prior to the current year are listed in the most recent annual "Price and Availability List." Publications that may be listed in various U.S. Geological Survey catalogs (see back inside cover) but not listed in the most recent annual "Price and Availability List" may no longer be available. Reports released through the NTIS may be obtained by writing to the National Technical Information Service, U.S. Department of Commerce, Springfield, VA 22161; please include NTIS report number with inquiry. Order U.S. Geological Survey publications by mail or over the counter from the offices listed below. BY MAIL OVER THE COUNTER Books Books and Maps Professional Papers, Bulletins, Water-Supply Papers, Tech­ Books and maps of the U.S. Geological Survey are available niques of Water-Resources Investigations, Circulars, publications of over the counter at the following U.S. Geological Survey offices, all general interest (such as leaflets, pamphlets, booklets), single copies of which are authorized agents of the Superintendent of Documents. of Earthquakes & Volcanoes, Preliminary Determination of Epicen­ ters, and some miscellaneous reports, including some of the forego­ ing series that have gone out of print at the Superintendent of ANCHORAGE, Alaska-Rm. 101,4230 University Dr. Documents, are obtainable by mail from LAKEWOOD, Colorado-Federal Center, Bldg. 810 U.S. Geological Survey, Information Services Box 25286, Federal Center MENLO PARK, California-Bldg. 3, Rm. 3128, Denver, CO 80225 345 Middlefield Rd. Subscriptions to periodicals (Earthquakes & Volcanoes and RESTON, Virginia-USGS National Center, Rm. 1C402, Preliminary Determination of Epicenters) can be obtained ONLY 12201 Sunrise Valley Dr. from the SALT LAKE CITY, Utah-Federal Bldg., Rm. 8105, Superintendent of Documents 125 South State St. Government Printing Office Washington, DC 20402 SPOKANE, Washington-U.S. Post Office Bldg., Rm. 135, West 904 Riverside Ave. (Check or money order must be payable to Superintendent of Documents.) WASHINGTON, D.C.-Main Interior Bldg., Rm. 2650, 18th and CSts.,NW Maps Maps Only For maps, address mail orders to Maps may be purchased over the counter at the following U.S. Geological Survey, Information Services U.S. Geological Survey offices: Box 25286, Federal Center Denver, CO 80225 FAIRBANKS, Alaska-New Federal Bldg, 101 Twelfth Ave. Residents of Alaska may order maps from ROLL A, Missouri-1400 Independence Rd. U.S. Geological Survey, Earth Science Information Center 101 Twelfth Ave., Box 12 STENNIS SPACE CENTER, Mississippi-Bldg. 3101 Fairbanks, AK 99701 Table Mountain Quartzite and Moose Formation (new names) and Associated Rocks of the Middle Proterozoic Belt Supergroup, Highland Mountains, Southwestern Montana By J. Michael O'Neill BELT SUPERGROUP IN THE HIGHLAND MOUNTAINS AND PROBABLE EQUIVALENT ROCKS IN THE PIONEER AND ANACONDA RANGES, SOUTHWESTERN MONTANA J. Michael O'Neill and Robert C. Pearson, Editors U.S. GEOLOGICAL SURVEY BULLETIN 2121-A UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1995 U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary U.S. GEOLOGICAL SURVEY Gordon P. Eaton, Director For sale by U.S. Geological Survey, Information Services Box 25286, Federal Center Denver, CO 80225 Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government Library of Congress Cataloging-in-Publication Data O'Neill, J. Michael. Table Mountain Quartzite and Moose Formation (new names) and associated rocks of the middle Proterozoic Belt Supergroup, Highland Mountains, southwestern Montana / by J. Michael O'Neill. p. cm. (U.S. Geological Survey bulletin ; 2121) (Belt supergroup in the High­ land Mountains and probable equivalent rocks in the Pioneer and Anaconda ranges, south­ western Montana; A) Includes bibliographical references. Supt. of Docs, no.: I 19.3:2121-A 1. Geology, Stratigraphic Proterozoic. 2. Geology Montana Highland Mountains. 3. Table Mountain Quartzite (Mont.) 4. Moose Formation (Mont.) I. Title. II. Series. III. Series: Belt supergroup in the Highland Mountains and proba­ ble equivalent rocks in the Pioneer and Anaconda ranges, southwestern Montana ; A. QE75.B9 no. 2121-A [QE653.5] 557.3 s dc20 95-3772 [551.7'15] CIP CONTENTS Abstract.......................................................................................................................... Al Introduction.................................................................................................................... 1 Middle Proterozoic Regional Geologic Setting ..................................................... 2 Previous Work........................................................................................................ 3 Stratigraphic Nomenclature........................................................................................... 3 Lower Belt Rocks................................................................................................... 3 Lahood Formation.......................................................................................... 3 Lithologic Description........................................................................... 5 Facies...................................................................................................... 6 Moose Formation........................................................................................... 6 Type Locality and Type Section............................................................ 8 Contacts with Adjacent Units................................................................. 10 Facies...................................................................................................... 10 Table Mountain Quartzite.............................................................................. 12 Type Locality and Type Section ............................................................ 12 Contacts with Adjacent Units................................................................. 14 Facies...................................................................................................... 14 Newland Formation........................................................................................ 14 Lithologic Description........................................................................... 15 Contacts with Adjacent Units................................................................. 15 Facies...................................................................................................... 15 Ravalli Group......................................................................................................... 16 Greyson Shale................................................................................................ 16 Lithologic Description and Facies ......................................................... 16 Spokane Formation........................................................................................ 17 Lithologic Description........................................................................... 17 Contacts with Adjacent Units................................................................. 18 Facies...................................................................................................... 19 Empire Formation.......................................................................................... 19 Lithologic Description ........................................................................... 19 Middle Belt Carbonate Rocks................................................................................ 19 Helena Formation........................................................................................... 19 Lithologic Description........................................................................... 19 Contacts with Adjacent Units................................................................. 20 Facies...................................................................................................... 20 Missoula Group...................................................................................................... 21 Lithologic Description and Facies ................................................................. 21 Contacts with Adjacent Units......................................................................... 22 Middle Cambrian Rocks ........................................................................................ 22 Tectonics and Sedimentation......................................................................................... 22 References Cited............................................................................................................ 25 FIGURES 1. Index map showing location of study area, extent of Belt Supergroup rocks, and location of Helena embayment of the Belt Basin .................................................................................................................................. A2 2. Map and cross
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