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Author:
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ISBN:
Category : Geology
Languages : en
Pages : 340
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Book Description
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 340
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Book Description
Author: Raymond R. Anderson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 242
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 1324
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Author:
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ISBN:
Category : Geology
Languages : en
Pages : 100
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Author: Roger T. Saucier
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 118
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Author: Geological Survey (U.S.)
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ISBN:
Category : Geology
Languages : en
Pages : 796
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Book Description
1785/1918 includes material issued previously in the annual Bibliography of North America geology, and in cumulative volumes issued by N. H. Darton and F. B. Weeks. 1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Mines and mineral resources
Languages : en
Pages : 200
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ISBN:
Category :
Languages : en
Pages : 1514
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Author: Gene L. LaBerge
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Category : Faults (Geology)
Languages : en
Pages : 346
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A reconnaissance study carried out in conjunction with regional geologic mapping.
Author: Gene L. LaBerge
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 28
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Book Description
Proterozoic quartzite is exposed at several isolated localities within an area of nearly 13,000 square kilometers in Wisconsin. Although early workers proposed that the quartzite is of two different ages, more recent workers have suggested that the various quartzite bodies are correlative, and that their protoliths were deposited between 1,760 and 1,630 Ma. Structural and stratigraphic studies of the quartzite deposits together with new age data indicate that the quartzite is at least of two distinct ages. Quartzite at McCaslin and Thunder Mountains, in northeastern Wisconsin, is older than 1,812 Ma, as indicated indirectly by a dated intrusion, and quartzite boulders in conglomerates in central Wisconsin are at least as old as the rhyolite country rock (=1,840 Ma). Deformed quartzite at Hamilton Mounds, in south-central Wisconsin, is intruded by undeformed granite that is 1,764 Ma. The ages of many other quartzite bodies, however, cannot be tightly constrained at present. Quartzite exposed in central and southern Wisconsin, south of the Eau Pleine shear zone, is interpreted as remnants of a passive margin sequence that was deposited on an Archean microcontinent (Marshfield terrane) and subsequently deformed in a major south-verging fold-thrust system during collision between the microcontinent and oceanic-arc rocks of the Pembine-Wausau terrane. The occurrence of quartzite-bearing conglomerates in the 1,860 Ma volcanic rocks of the Marshfield terrane suggests that the allochthonous quartzite bodies are 1,860 Ma or older. Collision occurred at about 1,840 Ma, and marked the end of the Penokean orogeny.
