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This list includes stratigraphic units and structural geologic features in Massachusetts, grouped by age and by region within the state.

Stratigraphic Units

Eastern Massachusetts

Proterozoic

• Mattapan Volcanic Complex
• Lynn Volcanic Complex
• Middlesex Fells Volcanic Complex

Cambrian

• Hoppin Formation
• Greenlodge Formation
• Weymouth Formation

Silurian-Devonian

• Newbury Volcanic Complex

Pennsylvanian (Late Carboniferous)

• Bellingham Conglomerate
• Narragansett Bay Group

Structural Geologic Features

Eastern Massachusetts

Basins, Zones, Troughs & Blocks

• Bellingham Basin
• Boston Basin
• Burlington mylonite zone
• Middleton Basin
• Nantucket Basin
• Narragansett Basin
• Nashoba Zone
• Nashua trough
• Newbury Volcanic Zone
• Norfolk Basin

Faults

• Bloody Bluff fault
• Clinton-Newbury fault

References

1. U.S. Geological Survey Professional Paper. U.S. Government Printing Office. 1984. p. 1.

• Geologic formations of Massachusetts