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The Origin of Some of the Siliceous Miocene Rocks of California. Stratigraphic Position of Some of the Diatomite Horizons in the Los Angeles Basin, California

Citation

Smith, Hampton (1934) The Origin of Some of the Siliceous Miocene Rocks of California. Stratigraphic Position of Some of the Diatomite Horizons in the Los Angeles Basin, California. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/X7D1-HG73. https://resolver.caltech.edu/CaltechTHESIS:04182018-082536997

Abstract

Origin of some of the siliceous Miocene rocks of California:

The upper Miocene marine section in California is characterized in many places by the presence of unusually large amounts of highly siliceous rocks. These can be roughly divided into two classes: the lithified chert-like beds which are characteristic of, and generally largely confined to, the lower part of the section, and the unconsolidated diatomites and diatomaceous and radiolarian silts which are commonly found overlying them. The chert-like beds have been referred to in California geological literature by a variety of names, including cherty shales, platy shales, siliceous shales and cherts. The merits of these, and some other designations are discussed in the section on nomenclature and it will suffice to say here that the writer has decided to use only the terms chert and cherty shale. In addition to the siliceous rocks the lower part of the Upper Miocene or the immediately underlying part of the section frequently contains considerable amounts of volcanic material, both extrusive and intrusive in nature.

The Stratigraphic Position of Some of the Diatomite Horizons in the Los Angeles Basin:

In most places in the Los Angeles Basin where a complete section of upper Miocene rooks is exposed there exists a mappable unit which is composed largely of soft, white, highly diatomaceous silt. This unit is commonly referred to as the diatomite. It varies considerably in thickness and in its relationship to other rook types, but the constancy of its lithologic characteristics considered in conjunction with their unusualness suggests that the unit bas stratigraphic significance. Since, however, structural and physiographic conditions make it impossible to trace the diatomaceous deposits continuously around the Los Angeles Basin, the only method of determining the age relationships of various isolated areas of these rooks is the paleontological one.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Geology
Degree Grantor:California Institute of Technology
Division:Geological and Planetary Sciences
Major Option:Geology
Minor Option:Paleontology
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Unknown, Unknown
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1934
Additional Information:Thesis has two parts: [Part 1 = pp.1-138]. The Origin of Some of the Siliceous Miocene Rocks of California. [Part 2 = pp.139-145]. Stratigraphic Position of Some of the Diatomite Horizons in the Los Angeles basin, California. Supplemental Files Information: Geologic map of the San Pedro Hills, Los Angeles County, California: Supplement 1 from "The Origin of Some of the Siliceous Miocene Rocks of California. Stratigraphic Position of Some of the Diatomite Horizons in the Los Angeles basin, California" (Thesis). Columnar sections thru lower member : Supplement 2 from "The Origin of Some of the Siliceous Miocene Rocks of California. Stratigraphic Position of Some of the Diatomite Horizons in the Los Angeles basin, California" (Thesis). Map showing the localities in the diatomite from which foraminifera were examined: Supplement 3 from "The Origin of Some of the Siliceous Miocene Rocks of California. Stratigraphic Position of Some of the Diatomite Horizons in the Los Angeles basin, California" (Thesis)
Record Number:CaltechTHESIS:04182018-082536997
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:04182018-082536997
DOI:10.7907/X7D1-HG73
Related URLs:
URLURL TypeDescription
https://doi.org/10.22002/D1.994DOISupplement 1 in CaltechDATA: Geologic map of the San Pedro Hills, Los Angeles County, California
https://doi.org/10.22002/D1.995DOISupplement 2 in CaltechDATA: Columnar sections thru lower member
https://doi.org/10.22002/D1.996DOISupplement 3 in CaltechDATA: Map showing the localities in the diatomite from which foraminifera were examined
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10813
Collection:CaltechTHESIS
Deposited By: Tony Diaz
Deposited On:26 Apr 2018 18:37
Last Modified:04 Oct 2019 00:20

Thesis Files

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PDF (Thesis) - Final Version
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61MB
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PDF (Geologic map of the San Pedro Hills, Los Angeles County, California) - Supplemental Material
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99MB
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PDF (Columnar sections thru lower member) - Supplemental Material
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1MB
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PDF (Map showing the localities in the diatomite from which foraminifera were examined) - Supplemental Material
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