Paleontological correlation made utilizing cosmopolitan fossil assemblages. Localized range changes may not reflect evolution, but migration or biogeographic shifts. Most biochemically stable fossils may be reworked. Reflect fast evolutionary rate Biozones Range Zone. To learn more about the use of fossil's, visit the United States Geological Survey's Fossils, Rocks, and Time publication.
Adaptions reflect function.
Stomatal density reflects atmospheric pCO2. Temperature-fractionation of O 18 used to build shells. The Paleogeographic Atlas Project at the University of Chicago has been mapping Earth's restless past for twenty years. They provide several animations depicting continental and environmental changes in the Phanerozoic. Copyright 1998-2001 by Robert A. Gastaldo.