8.5x11 in. with over 360 blk & wh illustrations,including photos, maps and sketches. The book is intended to teach basic geology, using Colorado examples, to the tourist and/or college freshman. The first 21 pages introduce rocks, minerals and basic terms of geology. Other chapters deal with specific areas of Colorado, such as Denver Basin, San Luis Valley, San Juan Mts. etc. Detailed index. 4800 already sold. A textbook at Mesa State College 5 years.