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U.S. Geological Survey
Open-File Report 03-225
Version 1.0
Online Only

Generalized Lithology and Lithogeochemical Character of Near-Surface Bedrock in the New England Region

By G.R. Robinson, Jr., and K.E. Kapo


This geographic information system (GIS) data layer shows the dominant lithology and geochemical, termed lithogeochemical, character of near-surface bedrock in the New England region covering the states of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. The bedrock units in the map are generalized into groups based on their lithological composition and, for granites, geochemistry. Geologic provinces are defined as time-stratigraphic groups that share common features of age of formation, geologic setting, tectonic history, and lithology.

This data set incorporates data from digital maps of two NAWQA study areas, the New England Coastal Basin (NECB) and the Connecticut, Housatonic, and Thames River Basins (CONN) areas and extends data to cover the states of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. The result is a regional dataset for the lithogeochemical characterization of New England (the layer named NE_LITH). Polygons in the final coverage are attributed according to state, drainage area, geologic province, general rock type, lithogeochemical characteristics, and specific bedrock map unit.


fig 1 thumb fig 2 thumb fig 3 thumb
Figure 1. Geologic provinces of New England Figure 2. General lithology distribution in New England Figure 3. Lithology distribution in New England (Group B)

Data Available in this Report

Publication report [500-KB Adobe PDF file]
Formal Metadata
(Also includes Abstract, Purpose, Supplemental Information, and Bibliographic References)
Lithogeochemical Unit Descriptions
HTML table of primary lithogeochemical classification scheme used
Rock Groups A and B
HTML tables of dominant bedrock lithologies used
Compressed GIS Data [14 MB]
(Documentation, ArcXML projects, ArcView 3.x legends, and GIS data) (complete listing of files)

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For questions about the scientific content of this report, contact G.R. Robinson, Jr.

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