Geologic Field Trips in Northern Oregon and Southern Washington (Classic Reprint) - Couverture souple
Présentation de l'éditeur
The geology of Oregon is as varied and fascinating as that of any state of the Union. East of Portland lies the north-south trending Cascade Range, a snow-capped volcanic pile. Farther east lie flood basalts, batholithic highs, and Basin and Range terrain. West of the Cascades the interaction of land, sea, and volcanism has left a challenging geologic record. In tune with geologic developments around the world, the plate tectonic model is finding increasing application to the geology of the State of Oregon. The imbricate thrust complex of Mesozoic rocks in southwestern Oregon has been attributed to sea-floor spreading, and recently the enigmas associated with the Colebrooke Schist have begun to yield to analysis in terms of the new tectonics. Recent work in the Tertiary units about the periphery of the Klamath Mountains may soon lead to an even more accurate appraisal of the age and nature of the later stages of plate tectonic activity in that area. Closer to home, the Coast Range is largely unmapped and is ripe for reinterpretation in terms of the new tectonics. The fault blocks, basalt flows, and ignimbrites of southeastern Oregon are undergoing re-evaluation in terms of some of the subtler aspects of sea-floor spreading. Tensional shearing related to deep-seated upwelling may account for the tapping of basaltic magma at depth and for the regional development of block faulting. Similar mechanisms may account for the extensive flood basalts of the Columbia River Group to the north. Both may be part of a larger picture in which late Miocene re-orientations of plate tectonic features profoundly affected the geology of much of the Pacific Basin and the world. Going back in time, the early and middle Tertiary andesites of the Cascades Range and the John Day Basin may be interpreted as volcanic material produced by differential melting of a lithospheric plate re
(Typographical errors above are due to OCR software and don't occur in the book.)
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Geologic Field Trips in Northern Oregon and Southern Washington
impression à la demandeVendeur : Forgotten Books, London, Royaume-Uni
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Paperback. Etat : New. Print on Demand. This book takes readers on a captivating exploration of the diverse geological landscapes of northern Oregon and southern Washington. Through a series of meticulously documented field trips, the author delves into the fascinating geological history of the region, spanning from the Cretaceous period to the Cenozoic era. The book examines the intricate interplay of volcanic activity, tectonic movements, and erosional forces that have shaped the region's mountains, valleys, and river systems. With a focus on stratigraphy, the study of rock layers and their formation, the author unravels the complex sequence of geological events that have left their mark on the landscape. From the marine sediments of the Cretaceous period to the volcanic eruptions of the Cenozoic era, each chapter offers a window into a distinct phase of geological time. Central to the book's exploration is the concept of plate tectonics and its profound influence on the region's geological evolution. The author skillfully integrates this framework to explain the formation of mountain ranges, the eruption of volcanic rocks, and the deposition of sedimentary layers. By examining the distribution and characteristics of different rock types, readers gain insights into the dynamic processes that have shaped the Earth's crust over millions of years. This book's insights into the geological history of northern Oregon and southern Washington not only enhance our understanding of the region's landscapes but also provide a valuable framework for appreciating the broader story of Earth's dynamic past. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. N° de réf. du vendeur 9781330735213_0
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Geologic Field Trips in Northern Oregon and Southern Washington Classic Reprint
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PAP. Etat : New. New Book. Shipped from UK. Established seller since 2000. N° de réf. du vendeur LW-9781330735213
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Geologic Field Trips in Northern Oregon and Southern Washington Classic Reprint
Vendeur : PBShop.store UK, Fairford, GLOS, Royaume-Uni
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PAP. Etat : New. New Book. Shipped from UK. Established seller since 2000. N° de réf. du vendeur LW-9781330735213
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