GEON (GEOscience Network) http://www.geongrid.org
CHRONOS http://www.chronos.org
Marine Geoscience Data Management System (MGDMS) http://www.marine-geo.org
PaleoStrat http://www.paleostrat.com
EarthChem http://www.earthchem.org
PetDB http://petdb.ldeo.columbia.edu/petdb
GEOROC http://georoc.mpch-mainz.gwdg.de/georoc/
NAVDAT http://navdat.geo.ku.edu/
Houston Research Center/Bureau of Economic Geology http://www.beg.utexas.edu/crc/houston.htm
The United States Polar Rock Repository (USPRR) http://www-bprc.mps.ohio-state.edu/rr/samples/