Open-File Report 03-225:
Figure 3
Figure 3. Bedrock Lithology Groups by Rock Group B categories.
This figure portrays the dominant lithology of the map units shown on the bedrock geologic maps covering the states of New England, categorized by Rock Group B classification. The Rock Group B categories are listed below:
- Unconsolidated Sediments (areas in the south-coastal part of New England where crystalline bedrock is overlain by Cretaceous marine sediments and thick deposits of glacial sediments)
- Basin Sediments (2 categories)
- Mesozoic Basin sediments
- Narragansett Basin sediments
- Granitic Rocks (6 categories)
- Alkali Granites (White Mountain Igneous Province)
- Peraluminous Granites of late Devonian and younger age
- Avalon Granites in Avalon Province
- Grenville Granites in Grenville Province
- Granites in Coastal Maine Province
- Other Granites
- Felsic Volcanics
- Mafic Rocks and their metamorphic equivalents (3 categories)
- Basalt
- Ultramafic rocks
- Other mafic rocks
- Metamorphic Rocks (6 categories)
- Calcareous Protolith
- Carbonate rocks
- Calcpelites
- Calcgranofels
- Pelitic rocks
- Sulfidic Schists
- Other metamorphic rocks
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