Cambrian(?), Middle Proterozoic, and Archean Rocks Penetrated in a Borehole Near Argenta, Beaverhead County, Montana, and Some Paleogeographic and Structural Implications PDF Download
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Author: Robert Carl Pearson
Publisher:
ISBN:
Category : Belt Supergroup
Languages : en
Pages : 24
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Author: Robert Carl Pearson
Publisher:
ISBN:
Category : Belt Supergroup
Languages : en
Pages : 24
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Author: William R. Calvert
Publisher:
ISBN:
Category : Coal
Languages : en
Pages : 83
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Author: Alisa L. Gallant
Publisher: DIANE Publishing
ISBN: 9780788148965
Category :
Languages : en
Pages : 90
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Produced as a framework for organizing and interpreting environmental data for inventory, monitoring, and research efforts. The descriptions of the 20 ecoregions of Alaska contained in this guide were derived by synthesizing information on the geographic distribution of environmental factors such as climate, terrain, soils, and vegetation. The specific procedures and materials used to delineate the ecoregion boundaries are documented, and the environmental characteristics in each ecoregion are described. Accompanied by a full-color oversize map of the ecoregions, their boundaries, and transitional areas. 42 full-color photos.
Author: J.-L. Bouchez
Publisher: Springer Science & Business Media
ISBN: 9401717176
Category : Science
Languages : en
Pages : 356
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viii debate of those earlier days has been beautifully summarized by H. H. Read in his famous "Granite Controversy" (1957). Read's formulation of the controversy occurred at the time when geochemistry was as a new and powerful tool. The new techniques opened era during which emerging an granites were considered mainly from this new viewpoint. Geochemical signatures have shown that mantle and crustal origins for granites were both possible, but the debate on how and why granites are emplaced did not progress much. Meanwhile, structural geology was essentially geometrical and mechanistic. In the early 70's, the structural approach began to widen to include solid state physics and fluid dynamics. Detailed structural maps of granitic bodies were again published, mainly in France, and analysed in terms of magmatic and plastic flow. The senior editor of this volume and his students deserve much of the credit for this new development. Via microstructural and petrofabric studies, they were able to discriminate between strain in the presence of residual melt or in the solid-state, and, by systematically measuring magnetic fabrics (AMS), they have been able to map magmatic foliations and lineations in ever finer detail, using the internal markers within granites coming from different tectonic environments. The traditional debate has been shifted anew. The burning question now seems to be how the necessary, large-scale or local, crustal extension required for granite emplacement can be obtained.
Author: Leonard D. Harris
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 48
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Description of and field guide to large- and small-scale features of thin-skinned tectonics in the Southern Appalachians, and a discussion of hydrocarbon production and potential.
Author: J. B. Zadra
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 54
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Author: John G. Ramsay
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 332
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In the case of nearly all branches of science a great advance was made when accurate quantitative methods were used of more qualitative. One great advantage of this is that it necessitates more accurate thought, points out what remains to be learned, and sometimes small residual quantities, which otherwise would escape attention, indicate important facts.
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 836
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Author: Wallace Gary Ernst
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1176
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Author: Charles Frederick Deiss
Publisher: Geological Society of America
ISBN: 0813720184
Category : Geology
Languages : en
Pages : 172
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