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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 Quaternary layer depicts geologic units of Quaternary age that are exposed at the Earth\u2019s surface in the conterminous United States. Although mostly consisting of unconsolidated materials commonly referred to as \"surficial deposits\", this layer also includes volcanic rocks of Quaternary age. Also included are all units that may, or are known to, span the Quaternary \u2013 Neogene boundary. Where present, units older than Quaternary and map units that are primarily colluvium and/or residuum are categorized as generalized rock and regolith units. 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These products and static images of the layers are available from the National Geologic Map Database, at https://ngmdb.usgs.gov/Prodesc/proddesc_118545.htm. 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