Early Proterozoic Geology of the Great Lakes Region PDF Download
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Author: L. Gordon Medaris
Publisher: Geological Society of America
ISBN: 0813711606
Category : Science
Languages : en
Pages : 151
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Book Description
Author: L. Gordon Medaris
Publisher: Geological Society of America
ISBN: 0813711606
Category : Science
Languages : en
Pages : 151
Get Book Here
Book Description
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 666
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Book Description
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 452
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 360
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Book Description
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 372
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Book Description
Author: Gene L. LaBerge
Publisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 346
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Book Description
A reconnaissance study carried out in conjunction with regional geologic mapping.
Author: Paul Kibler Sims
Publisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 268
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Book Description
The 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: E. Neal Hinrichs
Publisher:
ISBN:
Category : Coal
Languages : en
Pages : 246
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Book Description
Modal, chemical, and isotopic data for the granitic rocks of the Tuolumne Meadows quadrangle.
Author: Paul Kibler Sims
Publisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 28
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Book Description
Author: John C. Crowell
Publisher: Geological Society of America
ISBN: 9780813711928
Category : Science
Languages : en
Pages : 126
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Book Description
Ancient ice ages are revealed by distinctive stratal facies that tell us much about the times of coolness and how the climate system works. Several strong ice ages were recorded in the late Paleozic time and during transitions from the Devonian in to the Carboniferous and from the Ordovician in to the Silurian. In Precambrian time, several are documented for both the late and early Proterozoic age. This title explores findings on the pre-Mesozoic ice ages, examining climate in relation to tectonobiogeochemical activities rooted in the changing earth-air-ocean system.
