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Stratigraphy of the Proterozoic Revett Formation, Coeur d'Alene District, Idaho

By Jeffrey L. Mauk1

Open-File Report 01-319
Version 1.0


U.S. Department of the Interior
Gail 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 (USGS) 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.

1Now at Geology Department, University of Auckland, Private Bag 92019, Auckland, New Zealand.

photograph of tan thick hard layers of rock
Photograph of subvitreous to sericitic quartzite beds to 1 m thick (from figure 5).


This publication is an online version of U.S. Geological Survey Open-File Report 01-319. The data for this publication total 182 MB.


The Proterozoic Revett Formation of the Belt Supergroup contains three informal members that can be identified throughout the Coeur d'Alene 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 d'Alene 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.

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Open-File Report 01-319 - MAIN TEXT as an PDF with hyperlinks to the plates and appendixes (36 pages, 1.2 MB).

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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 publication consists of the online version of a CD-ROM publication that contains, in addition to the information on this Web site, CD-ROM-autoplay files for Windows, installer software for Adobe Reader, and a search index. The data for this publication total 235 MB on the CD-ROM. The CD-ROM is available for sale from:

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For questions about the content of this report, contact Jeffrey Mauk, Steve Peters, or Mike Zientek.

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