The GeoWhen database was compiled by Robert A. Rohde (1). It is an extensive suite of regional stage successions with approximate calibrations to the International scale. The suite was used by Rohde & Muller (Nature 2005) to analyze cycles in biodiversity through the Phanerozoic.
NOTE: GeoWhen was compiled in 2004. See our "Resources" for selected revised inter-regional correlation diagrams, or the TimeScale Creator chart-making package for updated age estimates.


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GeoWhen Database



(1) Physics Department
University of California at Berkeley
Berkeley, CA 94720-7300