REEFS

http://192.206.48.3/reef/
The virtual Silurian Reef

http://geoinfo.nmt.edu/staff/scholle/guadalupe.html
An introduction and Virtual Geologic Field Trip to the Permian Reef Complex, Guadalupe and Delaware Mountains, New Mexico-West Texas.

http://www.nps.gov/care/geology1.htm
Geological field trip to Capital Reef State Park, Utah