Sekwi Mountain Map-area, Yukon Territory and District of Mackenzie [105 P) PDF Download
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Author: S. L. Blusson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 30
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Author: S. L. Blusson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 30
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Book Description
Author: S. L. Blusson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 17
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Author: S. L. Blusson
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Akira Sasaki
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 460
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Author: Hubert Gabrielse
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 458
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Author: Robert C. Handfield
Publisher: R. Duhamel
ISBN:
Category : Geology
Languages : en
Pages : 36
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 808
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Author: L.J. Salop
Publisher: Springer Science & Business Media
ISBN: 3642686842
Category : Science
Languages : en
Pages : 471
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Book Description
Progress in Precambrian geology has been exceptionally great, indeed quite striking for geologists of the older generation; only some 30-40 years ago the Precambrian appeared as an uncertain and even mystic prelude to geologic evolution. Even the very name - Precambrian - means some indi visible unit in the early history of the Earth, the beginning of which is poorly known. At the same time it was obvious that the Precambrian formations are of extremely varied and complex composition and poor knowledge and lack of reliable methods of division and correlation were to blame for the lack of significant progress in studies of this early evolutionary stage of the planet. Certainly, even at the very start of Precambrian studies, the results obtained were quite promising, lifting as they did the mysterious veil over the regional Precambrian; but they presented no general realistic picture of this early stage in the Earth's evolution at that time. Recently, this situation has completely changed, due to new methods of study of the older forma tions, and due also to the refinement of some well-known methods, in particular of division, dating, and correlation of "silent" metamorphic strata. Application of different isotope methods of dating was most impor tant in providing objective rock age and thereby the age of geologic events recorded in these rocks. Thus it became possible to reconstruct the oldest geologic period of our planet.
Author: James D. Aitken
Publisher: Geological Survey of Canada
ISBN:
Category : History
Languages : en
Pages : 36
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This bulletin provides a full description of the characteristics and stratigraphic relationships of the Sheepbed and younger formations of the central Mackenzie Mountains, and establishes new nomenclature for the Proterozoic post-Sheepbed formations. The earliest occurrences of fossils are placed in a clear relationship both to the youngest of the Proterozoic glacigenic deposits and the oldest Cambrian strata of the region. Four definitions of formations are proposed (Gametrail, Blueflower, Risky, and Ingta formations), with information on origin of name, type & reference sections, boundaries, dimensions, age, correlation, and origin.
Author: Geological Survey of Canada
Publisher:
ISBN:
Category : Alberta
Languages : en
Pages : 328
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