The Oligocene Bridge Creek Flora of the John Day Formation, Oregon PDF Download
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Author: Herbert William Meyer
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 376
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Book Description
This comprehensive systematic revision of the Bridge Creek flora is based on large collections of megafossil specimens from the John Day and Crooked River basins. The flora was found to be more diverse than previously recognized, with at least 125 species. At least 11 genera are extinct, but the majority are extant members of deciduous forests. The flora was derived from a variety of sources and represents a classic example of the broadleaved deciduous forests that became widespread at mid-latitudes following the Eocene-Oligocene climatic cooling.
Author: Herbert William Meyer
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 376
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Book Description
This comprehensive systematic revision of the Bridge Creek flora is based on large collections of megafossil specimens from the John Day and Crooked River basins. The flora was found to be more diverse than previously recognized, with at least 125 species. At least 11 genera are extinct, but the majority are extant members of deciduous forests. The flora was derived from a variety of sources and represents a classic example of the broadleaved deciduous forests that became widespread at mid-latitudes following the Eocene-Oligocene climatic cooling.
Author: Ralph Works Chaney
Publisher:
ISBN:
Category : Paleobotany
Languages : en
Pages : 76
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Book Description
Author: Frank Hall Knowlton
Publisher:
ISBN:
Category : Paleobotany
Languages : en
Pages : 264
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Book Description
Author: William N. Orr
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 316
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Book Description
Author: Daniel I. Axelrod
Publisher: Univ of California Press
ISBN: 9780520098244
Category : History
Languages : en
Pages : 164
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Book Description
This flora of 70 species is dominated by deciduous trees, many with descendants in China. Precipitation was 890 mm, mean annual temperature 12.5°C, the annual range 10°C, and freezing rare. Elevation was about 1000 meters. Comparison with the Horse Prairie flora, 30 miles east and across the present continental divide, indicates that the divide was then low and discontinuous, with warmer climate to the east.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 28
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Author: Greg John Retallack
Publisher: Geological Society of America
ISBN: 9780813723440
Category : Science
Languages : en
Pages : 202
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Book Description
Author: Ben A. LePage
Publisher: Springer Science & Business Media
ISBN: 9781402026317
Category : Science
Languages : en
Pages : 466
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Book Description
The plant fossil record indicates that the genus Metasequoia was widely distributed throughout the Northern Hemisphere from the early Late Cretaceous to the Plio-Pleistocene. Today the genus has shrunk to one species with approximately 5,000 mature individuals in southeastern China’s Xiahoe Valley. This book distills the current understanding of the biology, ecology and physiology of fossil and living Metasequoia, current research directions and problems that remain unresolved.
Author: Herbert William Meyer
Publisher: Geological Society of America
ISBN: 081372435X
Category : Science
Languages : en
Pages : 192
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Book Description
The Florissant formation's fossil beds and petrified forest are interesting in themselves but also shed light on questions of paleoecology, macroevolution, and taphonomy (the study of the process of fossilization). Meyer (National Park Service. Florissant Fossil Beds National Monument, Colorado) and Smith (U. of Colorado Museum of Natural History--Paleontology/geological sciences, UC, Boulder) introduce 11 papers examining Florissant fossil flora, fauna, mineralogy and geochemistry through different periods and via a model of the role of microbial mats in its preservation. An integrated database/Web site to further related research is also discussed. The monograph is well-illustrated with geologic maps and images of historical figures in the field and specimens, but is not indexed.
