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Author: Robert Minssen Kleinpell
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 372
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Book Description
Author: Robert Minssen Kleinpell
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 372
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Book Description
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: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 260
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Author: Samuel Y. Johnson
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 40
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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: Eldridge M. Moores
Publisher: Geological Society of America
ISBN: 0813723388
Category : Science
Languages : en
Pages : 507
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 64
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Author: Clarence A. Hall
Publisher: Geological Society of America
ISBN: 9780813723570
Category : Science
Languages : en
Pages : 502
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Book Description
Approximately 3000 middle and late Cenozoic nearshore marine molluscan taxa from western California are assigned to six time periods, spanning ~25 m.y. In this interdisciplinary study, western California is palinspastically restored for each of the time periods by backsliding and back-rotating large fault blocks or crustal units. Marine fossil assemblages are assigned to nearshore paleoclimatic regions or water masses within palinspastically restored California. In addition, this volume reveals positive feedback mechanisms between paleolatitudinal changes in sea-surface paleotemperature gradients and changes in the diversity of marine mollusks along the California coast through time; defines "equable" based effective temperatures; and analyzes extinction rates among macroinvertebrate marine taxa from coastal California and the possible causes of these extinctions. The late Paleogene to Neogene faunas reflect an increase in faunal diversity related to strengthened temperature gradients, greater extremes in sea-surface temperatures, reduction in temperateness, and the development of an embayed California coastline.
Author: Colin F. Williams
Publisher:
ISBN:
Category : Argillite
Languages : en
Pages : 214
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Book Description
Phosphatic concretions occur within diatomite in the upper part of the Miocene Monterey Formation near Lompoc, Calif. Absence of disruption of fine laminar bedding in the associated sediment by the concretions shows that they formed after complete compaction of the enclosing sediment.The concretions exhibit a strongly concentric color, chemical, and mineralogic zonation. Many of them are composed of a nucleus in which vivianite is the dominant mineral. Amorphous ferric phosphate, mitridatite, and francolite are the dominant phosphatic phases in successive layers toward the surface of the concretions. Cd and As contents increase tenfold from the nucleus outward, reaching a maximum of 2,000 ppm, whereas Ni content, with a maximum of 720 ppm, and Co content show the opposite trend. This mineralogy and elemental composition favor accretion under conditions of continuously increasing Eh and pH, during uplift into the fresh-ground-water zone of the terrestrial environment. Shale-normalized rare-earth-element patterns, however, suggest a marine source for the elements biogenic debris consisting of opal-A, organic matter, and carbonates of the enclosing sediment.
