In 1992, the National Geologic Mapping Act (NGMA) authorized the National Cooperative Geologic Mapping Program (NCGMP), now led by John Brock of USGS, whose purpose is to build the National Geologic Map Database (NGMDB). Under the leadership of Dave Soller of USGS, NGMDB consists of the Phase One Catalog, the Phase Two standards, and the Phase Three seamless database. In December 2019, Congress directed that Phase Three go ahead, to bring together detailed, national, and continental-resolution 2D and 3D information produced throughout the Survey and by federal and state partners.
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