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To fulfill this goal, the NCGMP created a map synthesis engine (Johnstone and others, 2025) based on the Geologic Map Schema (GeMS) standard and used it to bring together and (to some extent) to harmonize source geologic maps originally published by the USGS and by State Geological Surveys. Currently, this map covers the conterminous U.S.; however, work is underway to expand the coverage.The Pre-Quaternary geology layer depicts geologic units older than Quaternary, except for units whose ages span the Quaternary-Neogene boundary. The map was assembled from State geologic maps showing Pre-Quaternary \"bedrock\" in the glaciated regions of the Midwest and Northeast, which is mostly buried by Quaternary glacial deposits and, elsewhere, from State geologic maps showing geology at the earth\u2019s surface. Where present, Quaternary and Quaternary-Tertiary units are categorized as a generic cover unit. 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