Author: L. Gordon MedarisPublisher:
ISBN:
Category : Geology
Languages : en
Pages : 141
Book Description
Early Proterozoic Geology of the Great Lakes Region
Author: L. Gordon MedarisPublisher:
ISBN:
Category : Geology
Languages : en
Pages : 141
Book Description
Tectonic Imbrication and Foredeep Development in the Penokean Orogen, East-central Minnesota
Author: David Leroy SouthwickPublisher:
ISBN:
Category : Geology
Languages : en
Pages : 40
Book Description
Tectonic Imbrication and Foredeep Development in the Penokean Orogen, East-central Minnesota--an Interpretation Based on Regional Geophysics and the Results of Test-drilling
Author: David Leroy SouthwickPublisher:
ISBN:
Category : Geology
Languages : en
Pages : 40
Book Description
U.S. Geological Survey Bulletin
Author: U.S. Geological Survey Bulletin
Author: Gene L. LaBergePublisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 346
Book Description
A reconnaissance study carried out in conjunction with regional geologic mapping.
U.S. Geological Survey Bulletin
Author: E. Neal HinrichsPublisher:
ISBN:
Category : Coal
Languages : en
Pages : 246
Book Description
Modal, chemical, and isotopic data for the granitic rocks of the Tuolumne Meadows quadrangle.
Memoir
Author: Precambrian: Conterminous U.S.
Author: John C. Reed, Jr.Publisher: Geological Society of America
ISBN: 081375447X
Category : Science
Languages : en
Pages : 752
Book Description
This wide-ranging discussion of Precambrian rocks includes contributions from a diverse array of authors actively engaged in investigations of various aspects of U.S. Precambrian geology. Summary discussions by the editors of the five major chapters place these contributions in a logical regional framework.
Extreme Depositional Environments
Author: Marjorie A. ChanPublisher: Geological Society of America
ISBN: 9780813723709
Category : Science
Languages : en
Pages : 290
Book Description
U.S. Geological Survey Bulletin
Author: Paul Kibler SimsPublisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 268
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.