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Geologic Report on a Portion of the Lang Quadrangle


Smith, Clay Taylor (1938) Geologic Report on a Portion of the Lang Quadrangle. Bachelor's thesis, California Institute of Technology. doi:10.7907/Y2M5-NT67.


The area investigated in the Lang Quadrangle, California includes about seven square miles with desert vegetation and a maximum relief of about 1000 feet.

The area consists of two formations separated by an angular unconformity of about 30 degrees, the Escondido tentatively placed in middle Miocene, and the Mint Canyon, either upper middle Miocene or lower upper Miocene. The Escondido formation consists of alternate beds of sandstones and shales and lava flows. The Mint Canyon formation is a series of sandstones, conglomerates, and coarse terrace gravels all of terrestial origin.

The Escondido formation is folded into a tight pitching syncline with minor folds on it southern flank. A great deal of faulting has complicated the otherwise simple structure. The Mint Canyon formation is warped into a broad syncline and anticline which are almost exclusively depositional in origin. A great deal of minor faulting may be seen in this formation not to be correlated with that in the Escondido except in a few cases.

The historical geology has been summarized on page 35.

The economic deposits are unimportant and of no economic significance.

Item Type:Thesis (Bachelor's thesis)
Subject Keywords:Lang Quadrangle, Mint Canyon, Escondido Formation, Soledad Canyon
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:
  • None, None
Defense Date:1 June 1938
Additional Information:Supplemental Files Information: Geologic Map of a Portion of the Lang Quadrangle: Supplement 1 from "Geologic report on a portion of the Lang quadrangle" (Thesis). Geographic Location Bounding Box: -118.35 Degrees East; -118.4 Degrees West; 34.5 Degrees North; 34.433 Degrees South.
Record Number:CaltechTHESIS:12232009-141608396
Persistent URL:
Related URLs:
URLURL TypeDescription 1 in CaltechDATA: Geologic Map of a Portion of the Lang Quadrangle
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5483
Deposited By: Tony Diaz
Deposited On:14 Jan 2010 19:10
Last Modified:03 Oct 2019 23:44

Thesis Files

PDF (Thesis) - Final Version
See Usage Policy.

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


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