1_README.TXT Stratigraphy of the Proterozoic Revett Formation, Coeur dıAlene District, Idaho By Jeffrey L. Mauk(1) Open-File Report 01-319 Version 1.0 2002 U.S. Department of the Interior Gale A. Norton, Secretary U.S. Geological Survey Charles G. Groat, Director This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. (1) Geology Department, The University of Auckland, Private Bag 92019, Auckland, New Zealand. J.Mauk@auckland.ac.nz QUICK START For those already familiar with Adobe Acrobat Reader and who have version 5.0 or greater on their computer, go directly to the file of01-319.pdf. ABSTRACT The Proterozoic Revett Formation of the Belt Supergroup contains three informal members that can be identified throughout the Coeur dıAlene mining district of northern Idaho. The lower Revett Formation is dominated by quartzite, but also contains intervals of siltite. The middle Revett consists predominantly of siltite, though quartzite and argillite locally form significant intervals. The upper Revett consists of intervals of quartzite that alternate with intervals of siltite and/or thin-bedded argillite. These units show dramatic changes in thickness and sedimentary facies within the Coeur dıAlene mining district; changes that are more abrupt and extreme than seen elsewhere in the Belt basin. The regionally significant Osburn fault bisects the district, with 20 to 30 km of post-mineralization right-lateral strike-slip offset. South of this fault, the upper Revett is 640 m thick at the Bunker Hill mine in the west, 450 to 500 m thick in the centrally located Silver Belt, and over 550 m thick at the Reindeer Queen deposit to the east. North of the Osburn fault, the upper Revett is approximately 120 m thick in the vicinity of the Lucky Friday mine, but abruptly thins to 45 to 90 m to the north and northeast, in the southern end of the western Montana copper sulfide belt. The middle Revett Formation south of the Osburn fault appears to be 400 to 450 m thick. North of the Osburn Fault, the middle Revett thins to approximately 120 m in the Lucky Friday area, and to approximately 60 m at Military Gulch. The lower Revett Formation is approximately 1650 m thick south of the Osburn fault, but thins to 400 to 450 m thick to the north of the Osburn fault. Observed thickness changes support previous hypotheses that the current Osburn fault coincides with a Proterozoic synsedimentary fault that controlled sedimentation in this region. CONTENTS This CD-ROM contains Portable Document Format (.pdf) files for the main text of the report (of01-319.pdf) as well as the individual folders of images, data tables, and software. 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FOR SALE BY: USGS Information Services Box 25286 Denver Federal Center Denver, CO 80225 Telephone: (888) ASK-USGS The bibliographical reference for this publication is: Mauk, J.L., 2002, Stratigraphy of the proterozoic Revett Formation, Coeur d'Alene district, Idaho: U.S. Geological Survey Open-File Report 01-319 (CD-ROM). This report and any updates to it are available on line at http://geopubs.wr.usgs.gov/open-file/of01-319/ DISCLAIMERS This Compact Disc Read-Only Memory (CD-ROM) publication was prepared by an agency of the U.S. Government. Neither the U.S. Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe on privately owned rights. 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