A Caltech Library Service

A study of the heavy minerals of the Modelo formation in the eastern portion of the Santa Monica Mountains


Cogen, William Maurice (1933) A study of the heavy minerals of the Modelo formation in the eastern portion of the Santa Monica Mountains. Master's thesis, California Institute of Technology.


Within recent years there has been a renewed interest among geologists in the field of sedimentary petrography. This interest has been rewarded by the accumulation of much new and interesting data. Careful studies of the textures and mineral compositions of formations have yielded important clues regarding climatic and geographic conditions during ancient times. These studies have made it possible in some cases to correlate unfossiliferous sediments.

In this paper the writer is chiefly concerned with the heavy minerals of the Modelo sediments with the view to learning what lateral and vertical variations may occur in the mineral composition of a formation over a small area – a matter which is of great significance if the minerals are to be used as criteria for correlation – and to learn something of the paleogeography during the deposition of the sediments in question.

Although heavy minerals have served as the key to many perplexing problems, they have not been universally used with success. Many of the failures however, are directly attributable to unreasonable expectations on the part of investigators.

Item Type:Thesis (Master's thesis)
Subject Keywords:Geology
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 1933
Record Number:CaltechTHESIS:01122010-094652393
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5514
Deposited By: Tony Diaz
Deposited On:15 Jan 2010 20:22
Last Modified:26 Oct 2017 20:30

Thesis Files

PDF - Final Version
See Usage Policy.

PDF (Plate 1) - Supplemental Material
See Usage Policy.


Repository Staff Only: item control page