Record (and inferred reconstruction) of the origin and development of the earth since its formation.
National Geologic Map Database Geologic Names Lexicon GEOLEX [ More info] Search tool for locating lithologic and geochronologic unit names for geologic studies.
Online guide to the continental Cretaceous-Tertiary boundary in the Raton basin, Colorado and New Mexico [ More info] Field guide describing the geology and paleontology of the continental Cretaceous-Tertiary boundary in the Raton basin, Colorado and New Mexico.
Paleontology at the U.S. Geological Survey [ More info] USGS Paleontology home page documenting the wide diversity in paleontologic studies and applications within the USGS.
Precambrian Time - The Story of the Early Earth [ More info] Explains what we know about the early history of the earth and how we study the deposits formed during that time to understand the formation of the earth and life.
Southern California Mapping Project (SCAMP) [ More info] Description of the SCAMP project to produce geologic and geophysical maps and reports that describe the geologic setting and geologic history of southern California.
Sutter Buttes-the lone volcano in California's Great Valley [ More info] Explains history and structure of this unusual geologic feature.
Tapestry of time and terrain: union of two maps, geology and topography [ More info] Colored map compiled by merging geologic and topographic maps of the United States through computer processing and enhancement with links to panoramic movie using QuickTime, descriptions of features, and a game entitled Puzzle of Regions.
The Geologic Story of Colorado's Sangre de Cristo Range [ More info] Rock types, geologic structure, and the history of their formation in this mountain range.
The Geologic Time Spiral - A Path to the Past [ More info] Poster depicting the changes in the Earth and its life throughout its history.
The Great Ice Age [ More info] Booklet (PDF format) on the Pleistocene glaciations known as the Great Ice Age and the resulting geomorphological, climatic, and environmental changes that occurred on Earth during the period.
Alphabetical Index of Topics
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