Perfect for the first-time visitor or the seasoned traveler. Includes sections on the geologic records, regional geology, plate tectonies and the Colorado River

More than four million people visit the Grand Canyon National Park every year, but most visitors choose not to stray beyond the heavily visited trails or to ven

* Illustrated with more than 60 full-color illustration plates * The only field guide of its kind for this popular destination * Completely updated, compact vol

The complete guide for both novice rockhounds and experienced rock and mineral collectors with new and exciting collecting sites that exist and are easily acces

Rivers wind through earth, cutting down and eroding the soil for millions of years, creating a cavity in the ground 277 miles long, 18 miles wide, and more than