Author: Samuel Y. JohnsonPublisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 40
Book Description
Sedimentology of the Conglomeratic Lower Member of the Lospe Formation (Lower Miocene), Santa Maria Basin, California
Author: Samuel Y. JohnsonPublisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 40
Book Description
Sedimentology of the Conglomeratic Lower Member of the Lospe Formation (Lower Miocene), Santa Maria Basin, California
Author: Samuel Y. JohnsonPublisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 40
Book Description
Sedimentology of the Conglomeratic Lower Member of the Lospe Formation (Lower Miocene), Santa Maria Basin, California
Author: Samuel Y. JohnsonPublisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 30
Book Description
U.S. Geological Survey Bulletin
Author: U.S. Geological Survey Bulletin
Author: Colin F. WilliamsPublisher:
ISBN:
Category : Argillite
Languages : en
Pages : 214
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.
New Publications of the U.S. Geological Survey
Author: New Publications of the U.S. Geological Survey
Author: Geological Survey (U.S.)Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 462
Book Description
Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1020
Book Description
Monthly Catalog of United States Government Publications
Author: Publications of the Geological Survey
Author: Geological Survey (U.S.)Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 448
Book Description