Although prehistoric fossil finds generate the most geologic excitement, the rocks in which they are discovered are no less important to the continued research of our planet's past. Created by the interaction of massive movable plates, volcanic activity and the competing forces of erosion and deposition, geologic structures such as stone pillars, mountains and volcanoes add character and variety to the Earth's surface, while illuminating much about the processes that shape them.

Beginning with an examination of the Earth's crust, Rock Formations and Unusual Geologic Structures breaks down the crustal components of this basic surface material to chapters on basement rock and sedimentary strata, the various layers of deposits and sediments making up the Earth's outer skin.

Author Jon Erickson follows up with chapters explaining erosional effects and features, dating methods for specific geologic structures, fossil formation and fossil beds, plate tectonics (as revealed in mountain building and earthquakes), volcanic activity, and glacial activity. The book concludes with a chapter on more unusual structures, from rift valleys to huge upheaval domes to natural bridges.

The detailed text includes tables listing information on major deserts of the world, a chronology of the major ice ages, the variety of rock types and their characteristics, the ten most deadly volcanic eruptions and more. Illustrated throughout with more than 100 photos, maps and clear line drawings, Rock Formations is a thorough introduction to the changing world beneath our feet.