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Structural geology of the region between Pacoima and Little Tujunga Canyons, San Gabriel Mountains, California

Citation

Howell, Benjamin F., Jr. (1949) Structural geology of the region between Pacoima and Little Tujunga Canyons, San Gabriel Mountains, California. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/M2WZ-N476. https://resolver.caltech.edu/CaltechTHESIS:05012014-110111547

Abstract

An area of about 25 square miles in the western part of the San Gabriel Mountains was mapped on a scale of 1000 feet to the inch. Special attention was given to the structural geology, particularly the relations between the different systems of faults, of which the San Gabriel fault system and the Sierra Madre fault system are the most important ones. The present distribution and relations of the rocks suggests that the southern block has tilted northward against a more stable mass of old rocks which was raised up during a Pliocene or post-Pliocene orogeny. It is suggested that this northward tilting of the block resulted in the group of thrust faults which comprise the Sierra Madre fault system. It is show that this hypothesis fits the present distribution of the rocks and occupies a logical place in the geologic history of the region as well or better than any other hypothesis previously offered to explain the geology of the region.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:San Gabriel Mountains, structural geology, San Gabriel Fault, Sierra Madre Fault, Little Tujunga, Big Tujunga, Saugus Formation, Modelo Formation, Pico Formation
Degree Grantor:California Institute of Technology
Division:Geological and Planetary Sciences
Major Option:Geophysics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Buwalda, John P.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1949
Additional Information:Supplemental Files Information: Geological map of the region between Little Tujunga and Pacoima Canyons, San Gabriel Mountains, California: Supplement 1 from "Structural geology of the region between Pacoima and Little Tujunga Canyons, San Gabriel Mountains, California" (Thesis). Geographic Location Bounding Box: -118.333 Degrees East; -118.417 Degrees West; 34.35 Degrees North; 34.267 Degrees South. Structure outline map of the region between Little Tujunga and Pacoima Canyons, San Gabriel Mountains, California: Supplement 2 from "Structural geology of the region between Pacoima and Little Tujunga Canyons, San Gabriel Mountains, California" (Thesis). Geographic Location Point: [34.367,-118.333]. Structure sections – Part I: Supplement 3 from "Structural geology of the region between Pacoima and Little Tujunga Canyons, San Gabriel Mountains, California" (Thesis). Structure sections – Part II: Supplement 4 from "Structural geology of the region between Pacoima and Little Tujunga Canyons, San Gabriel Mountains, California" (Thesis). Chart I – Sequence of events in the development of the present structure of the Little Tujunga Region: Supplement 5 from "Structural geology of the region between Pacoima and Little Tujunga Canyons, San Gabriel Mountains, California" (Thesis). Chart II – Sequence of steps in the determination of the pre-faulting geologic structure: Supplement 6 from "Structural geology of the region between Pacoima and Little Tujunga Canyons, San Gabriel Mountains, California" (Thesis).
Record Number:CaltechTHESIS:05012014-110111547
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:05012014-110111547
DOI:10.7907/M2WZ-N476
Related URLs:
URLURL TypeDescription
https://doi.org/10.22002/D1.372DOISupplement 1 in CaltechDATA: Geological map of the region between Little Tujunga and Pacoima Canyons, San Gabriel Mountains, California
https://doi.org/10.22002/D1.373DOISupplement 2 in CaltechDATA: Structure outline map of the region between Little Tujunga and Pacoima Canyons, San Gabriel Mountains, California
https://doi.org/10.22002/D1.374DOISupplement 3 in CaltechDATA: Structure sections – Part I
https://doi.org/10.22002/D1.375DOISupplement 4 in CaltechDATA: Structure sections – Part II
https://doi.org/10.22002/D1.376DOISupplement 5 in CaltechDATA: Chart I – Sequence of events in the development of the present structure of the Little Tujunga Region
https://doi.org/10.22002/D1.377DOISupplement 6 in CaltechDATA: Chart II – Sequence of steps in the determination of the pre-faulting geologic structure
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8208
Collection:CaltechTHESIS
Deposited By: John Wade
Deposited On:01 May 2014 19:55
Last Modified:21 Dec 2019 04:29

Thesis Files

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PDF - Final Version
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19MB
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PDF (Geological map) - Supplemental Material
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143MB
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PDF (Structure outline map) - Supplemental Material
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22MB
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PDF (Structure sections – Part I) - Supplemental Material
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86MB
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PDF (Structure sections – Part II) - Supplemental Material
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70MB
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PDF (Chart I - Sequence of events) - Supplemental Material
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7MB
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PDF (Chart II - Sequence of steps) - Supplemental Material
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5MB

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