Local precipitation has flowed through the valley-fill materials,
creating voids through the process of piping.
The void in this arroyo bank is more than 6 m high.

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U.S. Department of the Interior
U.S. Geological Survey
This page is http://esp.cr.usgs.gov/rio_puerco/puerco2/piping.html
Maintained by Richard Pelltier
Last modified: 15:04:23 on 15-Mar-2006