Geologic ages of earth history/External Links


 * International Commission on Stratigraphy Retrieved 17 April, 2007
 * Major Divisions of Geologic Time US Geological Survey. Retrieved 15, April, 2007
 * Geologic Age USGS. Retrieved 15, April, 2007
 * Geological Ages of the Earth OTS Heavy Oil Science Center. Retrieved 15, April, 2007
 * Web Geological Time Machine University of California Museum of Paleontology . Retrieved 15, April, 2007
 * Division of Earth Sciences National Science Academies Press. Retrieved 17 April, 2007
 * Geologic Ages of Earth History Dinosauria On-line. Retrieved 15, April, 2007
 * Subcommission of ICS International Commission on Stratigraphy (ICS), International Union of Geological Sciences (IUGS).