35th Annual Institute on Lake Superior Geology
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Publisher:
Published: 1989
Total Pages: 75
ISBN-13:
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Author:
Publisher:
Published: 1989
Total Pages: 75
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Published: 1989
Total Pages:
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DOWNLOAD EBOOKAuthor: John C. Green
Publisher: Houghton, Mich. : The Institute
Published: 1989
Total Pages: 138
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DOWNLOAD EBOOKAuthor: Institute on Lake Superior Geology. Meeting
Publisher:
Published: 1990
Total Pages: 114
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DOWNLOAD EBOOKAuthor:
Publisher:
Published: 1990
Total Pages: 114
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DOWNLOAD EBOOKAuthor:
Publisher:
Published: 1983
Total Pages: 372
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DOWNLOAD EBOOKAuthor: William J. Gregg
Publisher:
Published: 1993
Total Pages: 36
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DOWNLOAD EBOOKAuthor: Paul Kibler Sims
Publisher:
Published: 1983
Total Pages: 268
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DOWNLOAD EBOOKThe Early Proterozoic Michigamme Formation of northern Michigan was deposited in the southeastern part of the Animikie basin. The formation conformably overlies the Goodrich Quartzite and comprises three widespread members a lower member of thin-bedded shale, siltstone, and sandstone; the Bijiki Iron-formation Member; and an upper member of tur- biditic graywacke, siltstone, and mudstone and a few local members. The Goodrich Quartzite is interpreted as having been deposited in a tidally influenced shallow marine environ- ment. The lower member of the Michigamme is interpreted as having been deposited in a tidally influenced environment, the iron-formation member as having been deposited below wave base in somewhat deeper water, and the upper member as having been deposited in still deeper water with turbidity currents being a major depositional mechanism. Several lines of evidence including paleocurrents, paleo- geographic setting, and neodymium isotopes suggest that the graywacke of the southern part of the outcrop area was derived from the south (Early Proterozoic Wisconsin magmatic terranes, Archean miniplates, and older Early Proterozoic sedimentary units formed on the continental margin), and that the graywacke in the northern area was derived from an Archean terrane to the north. The tectonic model that best fits the available data is a northward-migrating foreland basin.
Author: Gene L. LaBerge
Publisher:
Published: 1991
Total Pages: 346
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DOWNLOAD EBOOKA reconnaissance study carried out in conjunction with regional geologic mapping.
Author: Geological Survey (U.S.)
Publisher:
Published: 1989
Total Pages: 836
ISBN-13:
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