Please Note: This is an archived website. It is recommended to search on-line for revised or newer information.
Link to USGS Home Page CGS home USGS home


Find Geologic Maps


Southern California Geology

Links and Resources

Site Contents

Contact Us

fault cros citting sedimentary rock

Photograph of faulted sedimentary rock layers exposed in a roadcut in Guatemala. The sedimentary rocks originally were deposited as horizontal layers of sand and gravel in streams and debris flows. After their deposition, the consolidated sediment was broken by a moderately-dipping normal-slip fault that has dropped layers left of the fault down about 3 meters relative to layers to the right; note the small subsidiary fault that dips even more shallowly and joins the main fault above the person's head. These kinds of relations are common where rocks of the earth's crust are stretched and pulled apart (extended), yielding faults like these that have normal dip-slip geometry. Photograph copyright J.K. Nakata, August, 1988 (used with permission).

Return to Previous Page

blue line
Southern California Areal Mapping Project logo
SCAMP Home Page
USGS Geology, Minerals, Energy, and Geophysics
California Geological Survey
USGS Home || Search USGS

blue line

  U.S. Department of the Interior, U.S. Geological Survey
Maintainer: WESP team webmaster contact
Privacy Statement || Disclaimer || Accessibility
This site last updated September 3, 2004 (ps)

First Gov