EarthWorks Geospatial Catalog

Surficial Sediments

Sediment data from the USGS publication, usSEABED: Atlantic Coast Offshore Surficial Sediment Data Release (USGS Data Series 118) were augmented by seafloor sediment data from DMF lobster surveys, DMF trawl surveys, EPA/EMAP grab samples, MWRA grab samples and SPI data, National Coastal Assessment grab samples, and USGS Open File Reports. The data points were converted to Thiessen polygons to create a surficial sediment map, resulting in the following four categories: muddy, sandy, gravelly, and hard bottom. Note that the distribution of points in the aggregate dataset is not uniform -- this causes polygons to differ in size and shape throughout Massachusetts waters.
Massachusetts, Gulf of Maine, Massachusetts Bay, Cape Cod Bay, Nantucket Sound, Vineyard Sound, Buzzards Bay, Massachusetts, Gulf of Maine, Ocean > Atlantic Ocean > North Atlantic Ocean, Ocean > Atlantic Ocean > North Atlantic Ocean > Gulf Of Maine, and Continent > North America > United States Of America > Massachusetts
oceans, 014, geoscientificInformation, 008, Oceans > Marine Sediments > Sedimentary Textures, Oceans > Marine Sediments > Sediment Composition, marine spatial planning, MSP, ocean management, coastal zone management, ecosystem-based management, and EBM
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