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Author: Robert Minssen Kleinpell
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 372
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Author: Robert Minssen Kleinpell
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 372
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Author: Roberta K. Smith
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 42
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Book Description
While several papers exist on the small scale spatial distribution of living foraminifera, almost no work exists on the small scale spatial distribution of fossils. The present study took 24 (5 ml) replicates 10 cm apart along one bed of the Monterey Formation in California.The mean density for all replicates is 6084.96 with a standard deviation of 8776.95. Both inspection and a cluster analysis of the data indicate replicates 20-24 have a much higher density and different rank order of abundance than replicates 1-19. The mean density for the total of all species in replicates 1-19 is 2387.47 with a standard deviation of 1175.58. For replicates 20-24 the mean density is 20135.40 with a standard deviation of 11181.40. The spatial variability is so great that four replicates (more than commonly taken) would only allow us to be 95% confident that we are within 50% of the true mean. Because age determination is based on presence of particular taxa rather than on densities, stratigraphic assignment would still be possible.The three species dominating the 1-19 group make up from 86% to 99% of the fauna. The three species dominating the 20-24 group make up from 77% to 85% of the fauna. Two of these are also dominant in the 1-19 group, but the most dominant species in the 20-24 group constitutes only
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 64
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 278
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Author: Judith Terry Smith
Publisher:
ISBN:
Category : Paleontology
Languages : en
Pages : 244
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Book Description
Thirty-nine taxa, many of them index species, are described and illustrated; their biostratigraphic and chronostratigraphic significance are related to tectnostratigraphic settings.
Author: Eldridge M. Moores
Publisher: Geological Society of America
ISBN: 0813723388
Category : Science
Languages : en
Pages : 507
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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 260
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Author: Donald R. Prothero
Publisher: Columbia University Press
ISBN: 0231127162
Category : Eocene-Oligocene boundary
Languages : en
Pages : 558
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Book Description
The marine Eocene-Oligocene transition of 34 million years ago was a critical turning point in Earth's climatic history, when the warm, high-diversity "greenhouse" world of the early Eocene ceded to the glacial, "icehouse" conditions of the early Oligocene. This book surveys the advances in stratigraphic and paleontological research and isotopic analysis made since 1989 in regard to marine deposits around the world. In particular, it summarizes the high-resolution details of the so-called doubthouse interval (roughly 45 to 34 million years ago), which is critical to testing climatic and evolutionary hypotheses about the Eocene deterioration. The authors' goals are to discuss the latest information concerning climatic and oceanographic change associated with this transition and to examine geographic and taxonomic patterns in biotic turnover that provide clues about where, when, and how fast these environmental changes happened. They address a range of topics, including the tectonic and paleogeographic setting of the Paleogene; specific issues related to the stratigraphy of shelf deposits; advances in recognizing and correlating boundary sections; trends in the expression of climate change; and patterns of faunal and floral turnover. In the process, they produce a valuable synthesis of patterns of change by latitude and environment.
Author: Patricia Alison McCrory
Publisher:
ISBN:
Category : Diatoms, Fossil
Languages : en
Pages : 68
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Book Description
Chapters J and K are issued as a single volume and are not availabe separately.
Author:
Publisher:
ISBN:
Category : Continental shelf
Languages : en
Pages : 432
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