Late Tertiary and Quaternary Geology of the Tecopa Basin, Southeastern California (1:48,000). PDF Download
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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Stratigraphic units in the Tecopa basin, located in southeastern California, provide a framework for interpreting Quaternary climatic change and tectonism along the present Amargosa River. During the late Pliocene and early Pleistocene, a climate that was appreciably wetter than today's sustained a moderately deep lake in the Tecopa basin. Deposits associated with Lake Tecopa consists of lacustrine mudstone, conglomerate, volcanic ash, and shoreline accumulations of tufa. Age control within the lake deposits is provided by air-fall tephra that are correlated with two ash falls from the Yellowstone caldera and one from the Long Valley caldera. Lake Tecopa occupied a closed basin during the latter part, if not all, of its 2.5-million-year history. Sometime after 0.5 m.y. ago, the lake developed an outlet across Tertiary fanglomerates of the China Ranch Beds leading to the development of a deep canyon at the south end of the basin and establishing a hydrologic link between the northern Amargosa basins and Death Valley. After a period of rapid erosion, the remaining lake beds were covered by alluvial fans that coalesced to form a pediment in the central part of the basin. Holocene deposits consist of unconsolidated sand and gravel in the Amargosa River bed and its deeply incised tributaries, a small playa near Tecopa, alluvial fans without pavements, and small sand dunes. The pavement-capped fan remnants and the Holocene deposits are not faulted or tilted significantly, although basins to the west, such as Death Valley, were tectonically active during the Quaternary. Subsidence of the western basins strongly influenced late Quaternary rates of deposition and erosion in the Tecopa basin.
Author:
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ISBN:
Category : Geology
Languages : en
Pages : 548
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Author: Oscar H. Hershey
Publisher:
ISBN:
Category : History
Languages : en
Pages : 648
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Author: Marith C. Reheis
Publisher: Geological Society of America
ISBN: 0813724392
Category : Science
Languages : en
Pages : 444
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Papers in this title were selected from presentations from an April 2005 workshop sponsored by the U.S. Geological Survey Earth Surface Dynamics Program, the U.S. Geological Survey National Cooperative Geologic Mapping Program, and the Smithsonian Institution. Papers are divided into two broad topics of the configuration, areal extent, and temporal development of the chain of interconnected lakes that emptied into Death Valley during periods of the Pleistocene, and the late Cenozoic history of drainage integration in the lower Colorado River region. Papers are occasionally illustrated in both color and black-and-white; the publication contains no index.
Author: R. H. Grapes
Publisher: Geological Society of London
ISBN: 9781862392557
Category : Science
Languages : en
Pages : 352
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These papers deal with various aspects of the histories of geomorphology and Quaternary geology in different parts of the world. They include: the origin of the term 'Quaternary', histories of ideas and debates relating to aspects of fluvial geomorphology, glacial geomorphology and glaciation, desert dunes and the geology of Australia, peneplains in China, a palaeo-Tokyo Bay in Japan, together with biographies of Charles Cotton, Valerija Čepulytė and Česlovas Pakuckas that highlight their respective contributions to the disciplines of geomorphology and Quaternary geology.
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : California
Languages : en
Pages : 476
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Author:
Publisher:
ISBN:
Category : California
Languages : en
Pages : 476
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 52
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 204
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