A Caltech Library Service

Geology of the Eastern Portion of the San Gabriel Mountains


McNaughton, Duncan Anderson (1934) Geology of the Eastern Portion of the San Gabriel Mountains. Master's thesis, California Institute of Technology. doi:10.7907/3CR8-FX22.


The San Gabriel Mountains form one of the units of east- west trending mountain belt of Southern California. They extend from the San Fernando and Santa Clara Valleys on the west to Cajon Pass on the east, and form a topographic boundary between the Mohave Desert on the north and the Coastal plain on the south.

The area, described in this report, occupies a rectangular block, seven miles long and three miles wide, in the eastern portion of the mountains. It lies entirely within San Bernardino County and includes parts of San Antonio, Cucamonga, Hesperia and San Bernardino Quadrangles.

With the exception of the long straight valleys of Lytle Creek and Lone Pine Canyon, the region is steep and rugged. Elevations range from 2700 feet in Cajon Pass to over 9000 feet at the summit of Telegraph Peak.

Most of the mapped area is quite accessible. The main highway between San Bernardino and Los Angeles Playground at Big Pines is located in Lone Pine Canyon. Paralleling this road and one and one-half miles to the southwest, there is a paved road which extends up the North Fork of Lytle Creek to Stockton Flats. During the greater part of the year it is possible to drive from Stockton Flats across the range to Camp Baldy. In addition to these two public highways, there are numerous roads and trails which have been constructed by the United States Forest Service.

Item Type:Thesis (Master's thesis)
Subject Keywords:San Gabriel Mountains, San Antonio Quadrangle, Cucamonga Quadrangle, Hesperia Quadrangle, San Bernardino Quadrangle, Lytle Creek, Lone Pine Canyon, Stockton Flats, Camp Baldy, Telegraph Peak
Degree Grantor:California Institute of Technology
Division:Geological and Planetary Sciences
Major Option:Geology
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Unknown, Unknown
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1934
Additional Information:Supplemental Files Information: Geologic map and section of the Eastern San Gabriel Mountains: Supplement 1 from "Geology of the eastern portion of the San Gabriel Mountains" (Thesis). Date(s) Collected: 1934.
Record Number:CaltechTHESIS:01202010-075449566
Persistent URL:
Related URLs:
URLURL TypeDescription 1 in CaltechDATA: Geologic map and section of the Eastern San Gabriel Mountains
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5531
Deposited By: Tony Diaz
Deposited On:20 Jan 2010 17:13
Last Modified:03 Oct 2019 23:44

Thesis Files

PDF (Thesis) - Final Version
See Usage Policy.

PDF (Geologic Map) - Supplemental Material
See Usage Policy.


Repository Staff Only: item control page