Imagine seeing the varied landscapes of the earth as they used to look throughout hundreds of millions of years of earth history. Tropical seas lap on the shore

The Supai Formation of the Grand Canyon region is raised in rank to Supai Group and divided into four formations that range in age from early Pennsylvanian to e

From the stately Queen Anne mansions of the West Side to the hastily constructed shanties of Cabbage Patch, Lost Butte, Montana traces the citys history through

-- All necessary geologic terms are defined -- Written at a level easy for readers to understand Arizona's geology is complex and its landscape varied. Yet, wit