List of stratigraphic units and structural features in Massachusetts

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^[1]

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