During the Triassic period 225 million years ago, the Petrified Forest National Park of northern Arizona was a lowland drained by meandering streams carrying sediment to a nearby sea. Rapid burial of trees in oxygen-poor sands promoted petrification as silica-rich groundwater replaced the woody material; hence the petrified wood for which the Park is renowned. This text provides a brief description of the geology and geologic features ¿ slump blocks, basaltic agglomerate, syncline, sand dunes, badlands, and more ¿ that make the Park and environs a geologic wonderland.

CD-ROM contains: Introductory text, maps, and geologically labeled photographs of all the parks.

Northern Utah's Wasatch Mountains are popular destinations for outdoor enthusiasts in every season. These mountains rise spectacularly from the relatively flat valley floor to thirteen peaks over 11,000 feet in elevation. An additional nineteen peaks rise more than 10,000 feet in elevation. Although many hiking guides exist for the Wasatch Mountains, there has been no guide book that focuses on the geologic features visible from the trails--until now. Written by a recognized authority on the geology of the Wasatch Mountains, this guide is meant to enrich the experience of outdoor enthusiasts who want to understand the geological history and development of the Wasatch range. The first section of the book introduces the major geological time periods--the record of mountain building events from oldest to youngest, the effects of glaciation, and the development of the present topography. It then follows with a descriptive trail guide for each major trail system, including Mill Creek and Neffs Canyons, Mount Olympus, Little and Big Cottonwood Canyons, and Bells Canyon. Trail length, elevation gain, relative difficulty, and major geological features are outlined for each trail. Now you can hike these trails with the answers to all your geologic questions right at your fingertips.

A guide to national parks in the West provides information on attractions, accommodations, restaurants, when to go, plants and animals, and activities for each park.

Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.