Brock River Map-area, District of Mackenzie (97 D) PDF Download
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Author: H. R. Balkwill
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 40
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Book Description
Gently folded, unmetamorphosed Upper Proterozoic (Hadrynian or Neohelikian) sedimentary rocks, with a total exposed thickness of about 6,000 feet, underlie most of the map-area; gabbro sills and dykes locally intrude the strata. Paleozoic, marine sedimentary rocks, ranging in age from Cambrian to Middle Devonian, and having an exposed thickness of about 1,700 feet, uncomformably overlie the Proterozoic rocks. Paleozoic rocks are separated by a regional hiatus from the overlying Cretaceous sequence that is about 700 feet thick and composed of quartz sandstones, siltstones, shale and coal. Thick, topographically prominent, Pleistocene glacial deposits obscure bedrock throughout wide regions.
Author: H. R. Balkwill
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 40
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Book Description
Gently folded, unmetamorphosed Upper Proterozoic (Hadrynian or Neohelikian) sedimentary rocks, with a total exposed thickness of about 6,000 feet, underlie most of the map-area; gabbro sills and dykes locally intrude the strata. Paleozoic, marine sedimentary rocks, ranging in age from Cambrian to Middle Devonian, and having an exposed thickness of about 1,700 feet, uncomformably overlie the Proterozoic rocks. Paleozoic rocks are separated by a regional hiatus from the overlying Cretaceous sequence that is about 700 feet thick and composed of quartz sandstones, siltstones, shale and coal. Thick, topographically prominent, Pleistocene glacial deposits obscure bedrock throughout wide regions.
Author: Geological Survey of Canada
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
Author:
Publisher: Elsevier
ISBN: 0080868444
Category : Science
Languages : en
Pages : 393
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Book Description
Precambrian of the Northern Hemisphere
Author:
Publisher: Natural Resources Canada
ISBN:
Category :
Languages : en
Pages : 218
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Book Description
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 1324
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Author:
Publisher: Natural Resources Canada
ISBN:
Category :
Languages : en
Pages : 97
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Author: Alan Nairn
Publisher: Springer
ISBN: 1475712480
Category : Science
Languages : en
Pages : 684
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Book Description
This trip backward in time capsulizes in a general way the geologic development of the area that is now northern Alaska. The Cretaceous through Recent history is predominantly one of erosion of the ancient Brooks Range and filling of the Colville Geosyncline under processes like those in Operation today. All the rocks older than Jurassic, however, were deposited far from their present sites. One of the intriguing tectonic puzzles involves the geographic positions and relative timing of events that occurred during the orogeny that built the Brooks Range. I suggest that pre-Cretaceous deposition took place far to the north along the western margin of the Caledonides. Subsequently, the region that is now northern Alaska moved southward and impinged upon a northward moving plate, or plates, from the Pacific region. Interactions between these two major parts of the earth's crust produced the Brooks Range during the Jurassic. Later developments reflect continuing readjustments of the northern third of of thrust Alaska as southward movement was dissipated in diverse systems faulting and lateral displacement. ACKNOWLEDGMENTS I am indebted to many colleagues who, during the past 30 years, shared with me the excitement and pleasures of exploring the geology of northern Alaska. Among these are W. P. Brosge, H. N. Reiser, R. L. Detterman, A. K. Armstrong, A. L. Bowsher, E. G. Sable, I. L. Tailleur, C. G. Mull, M. D. Mangus, A. H. Lachenbruch, M. C. Lachenbruch, R. L. Morris, C. J.
Author:
Publisher: Natural Resources Canada
ISBN:
Category :
Languages : en
Pages : 382
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Author:
Publisher: Natural Resources Canada
ISBN:
Category :
Languages : en
Pages : 142
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Book Description
Author:
Publisher: Natural Resources Canada
ISBN:
Category :
Languages : en
Pages : 68
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Book Description
