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Open-File Report 03-225: Figure 2

Bedrock Lithology Groups by Rock Group A categories

Figure 2. Bedrock Lithology Groups by Rock Group A 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 A classification. The Rock Group A categories are listed below:

  1. 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)
  2. Basin Sediments, includes Mesozoic Basin sediments and Narragansett Basin sediments
  3. Granitic Rocks and felsic volcanics
  4. Mafic Rocks and their metamorphic equivalents
  5. Metamorphic Rocks (3 categories)
    1. Calcareous Protolith
      1. Carbonate rocks
      2. Calcpelites
    2. Other metamorphic rocks

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