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Lithogeochemical Character of Near-Surface Bedrock in the New England Coastal Basins
This geographic information system (GIS) data layer shows the generalized
lithologic and geochemical, termed lithogeochemical, character of
near-surface bedrock in the New England Coastal Basins (NECB) study
area of the U.S. Geological Survey's National Water Quality Assessment
(NAWQA) Program. The area encompasses 23,000 square miles in western
and central Maine, eastern Massachusetts, most of Rhode Island,
eastern New Hampshire and a small part of eastern Connecticut.
The NECB study area includes the Kennebec, Androscogginn, Saco,
Merrimack, Charles, and Blackstone River Basins, as well as all
of Cape Cod. Bedrock units in the NECB study area are classified into
38 lithogeochemical units based on the relative reactivity of their
constituent minerals to dissolution and the presence of carbonate or
sulfide minerals. The 38 lithogeochemical units are generalized into 7
major groups: (1) carbonate-bearing metasedimentary rocks; (2)primarily
noncalcareous, clastic sedimentary rocks with restricted deposition in
discrete fault-bounded sedimentary basins of Mississipian or younger age;
(3) primarily noncalcareous, clastic sedimentary rocks at or above
biotite-grade of regional metamorphism; (4) mafic igneous rocks and
their metamorphic equivalents; (5) ultramafic rocks; (6) felsic igneous
rocks and their metamorphic equivalents; and (7) unconsolidated and poorly
consolidated sediments.
Complete Metadata
| @id | http://datainventory.doi.gov/id/dataset/ec5eae360982840d229d339bf4945702 |
|---|---|
| bureauCode |
[ "010:12" ] |
| identifier | USGS:148f11d8-5149-417f-a29d-663d2294206c |
| spatial | -72.19068043,41.13443365,-69.03158607,45.90221224 |
| theme |
[ "geospatial" ] |
