Geologic ages of earth history/External Links
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- Please sort and annotate in a user-friendly manner and consider archiving the URLs behind the links you provide. See also related web sources.
- 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).