Surficial Geology (1:24,000) - Postglacial Deposits
- The postglacial data layer is part of a comprehensive study to produce a statewide digital map of the surficial geology at a 1:24,000-scale. This compilation of surficial geologic materials defines the areas of exposed bedrock, and the boundaries between glacial till, glacial stratified deposits, and overlying postglacial deposits. The postglacial layer shows areas of swamp deposits, floodplain alluvium, and artificial fill. Swamp polygons may overlie alluvium polygons; artificial fill polygons may overlie areas of swamp or alluvium. This data layer should be used in conjunction with the underlying till bedrock, stratified deposits, and early postglacial data layers. MassGIS stores this layer as SURFGEO24K_PG_POLY.
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