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Geology of the Ravenna quadrangle


Jahns, Richard Henry (1935) Geology of the Ravenna quadrangle. Bachelor's thesis, California Institute of Technology.


The Vasquez Series, composed of coarse fanglomerates, finer sandstones, and lavas, represents sub-areal deposition in the form of a series of rapidly coalescing alluvial fans. These fans were formed in a basin entirely local in character (confined to the Ravenna and Lang Quadrangles) which was probably caused by faulting, either in late Oligocene or very early Miocene time. The sediments are early or early middle Miocene in age, are very well consolidated, poorly sorted, and broadly stratified. They occur associated with intrusions of quartz diorite, syenite, and anorthosite, contacting these formations either depositionally or by means of faults. The lavas are of both intrusive and extrusive origin. The extrusive type is both vesicular and amygdaloidal, while the intrusive type is massive. The section is broken by two major fault systems. The older of these, trending northwest-southeast, is represented by normal faults, whose movement is primarily vertical, while the younger system, trending nearly at right angles to the other, consists of steep strike-slip faults.

Item Type:Thesis (Bachelor'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 1935
Record Number:CaltechTHESIS:03172010-101510816
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5612
Deposited By: Tony Diaz
Deposited On:14 Apr 2010 21:34
Last Modified:19 Oct 2016 19:02

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