Citation
Cogen, William Maurice (1931) Geology of a Part of the Southwestern Portion of the San Gabriel Mountains. Bachelor's thesis, California Institute of Technology. doi:10.7907/BFQX-F624. https://resolver.caltech.edu/CaltechTHESIS:12142009-144520602
Abstract
The region is in the southwestern portion of the San Gabriel Mountains, north of Los Angeles, California.
Stratigraphically it is composed of a section of Neogene rocks with some up-faulted older rock. The normal sequence as represented here is: Upper Modelo, unconformity; Pico, conformity; Saugus, angular unconformity; Quaternary terraces. The basement rock, composed largely of para-gneiss, schist and intrusive granite, has been faulted up from below. Its age is pre-Miocene, possibly pre-Jurassic.
The structure of the region is characterized by faults of the dip-slip vertical or steeply normal type.
Geologically the history of the region is: invasion of the sea during Miocene time, deposition of the Modelo formation, broad uplift and subsequent denudation; faulting at the opening of the Pliocene, a second incursion of the sea, deposition of the Pico formation; orogenesis north of the region here described followed by withdrawal of the sea in Upper-Pliocene time, deposition of the Saugus formation (Piedmont Deposit); active faulting and orogenesis at the close of the Pliocene; continuous erosion with short resting stages during the Quaternary.
| Item Type: | Thesis (Bachelor's thesis) | |||||||||
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| Subject Keywords: | San Gabriel Mountains, basement rock, para-gneiss, schist, intrusive granite, Modelo Formation, Pico Formation, Saugus Formation | |||||||||
| Degree Grantor: | California Institute of Technology | |||||||||
| Division: | Geological and Planetary Sciences | |||||||||
| Major Option: | Geology | |||||||||
| Thesis Availability: | Public (worldwide access) | |||||||||
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| Defense Date: | 1 January 1931 | |||||||||
| Additional Information: | Supplemental Files Information: Geologic Map of a part of the Southwestern Portion of the San Gabriel Mountains: Supplement 1 from "Geology of a part of the southwestern portion of the San Gabriel Mountains" (Thesis). Topographic Map: Supplement 2 from "Geology of a part of the southwestern portion of the San Gabriel Mountains" (Thesis). Geographic Location Bounding Box: -118.33 Degrees East; -118.4 Degrees West; 34.33 Degrees North; 34.3 Degrees South. | |||||||||
| Record Number: | CaltechTHESIS:12142009-144520602 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechTHESIS:12142009-144520602 | |||||||||
| DOI: | 10.7907/BFQX-F624 | |||||||||
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| Default Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 5442 | |||||||||
| Collection: | CaltechTHESIS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 24 Dec 2009 19:18 | |||||||||
| Last Modified: | 03 Oct 2019 23:43 |
Thesis Files
![[img]](https://thesis.library.caltech.edu/style/images/fileicons/application_pdf.png)
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PDF (Thesis)
- Final Version
See Usage Policy. 5MB | |
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PDF (Geologic Map)
- Supplemental Material
See Usage Policy. 22MB | |
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PDF (Topographic Map)
- Supplemental Material
See Usage Policy. 6MB |
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