This page provides a brief outline of, lists the main points of, gives links to figures for, and lists the assigned reading for a lecture in Dr. Bruce Railsback's GEOL 1121 class at the University of Georgia. This page is not intended as a set of lecture notes, and it cannot subsititute for a set of lecture notes. Familiarity with this page alone will not assure satisfactory grades on exams in the course.

Lecture 12 (February 13): Faults

Brief outline of this lecture:
Faults
Faults in the field
Faults in a plate-tectonic context
Fractures
     

Main points of this lecture:
Different kinds of faults can be linked to different kinds of stress.
Drag folds are small partial folds along and generated by faults.
Newly-formed faults may be evident because of their disruption of the land surface.
Old faults may be evident because they have been eroded to make more-or-less linear valleys.
The faults on our handouts of plate tectonic boundaries should now make sense in terms of the stresses encountered there.
Fractures are breaks in rock along which no motion is evident.

Figures used in this lecture:
Faults: a definition and two handy terms
Simple faults
More faults
Drag folds
Surface expression of faults
Divergent plate boundaries (a diagram used earlier in class)
Convergent plate boundaries (a diagram used earlier in class)
Transform plate boundaries (a diagram used earlier in class)
Fractures

Reading assignment: None.


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Email to Railsback (rlsbk@gly.uga.edu)
Railsback's main 1121 web page
Railsback's main web page
UGA Geology Department web page