Title

Bedrock Phippsburg Photo 11

Creator

David P. West Jr.

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Contributing Institution

Maine Geological Survey

Document Type

Image

Identifier

70131

Description

Photo 11: Close-up view of an andalusite- and sillimanite-bearing quartz vein in the Cape Elizabeth Formation (Oce). In this rock, the andalusite is pink, and sillimanite occurs as thin cream-colored inclusions in the andalusite. Andalusite and sillimanite are Al₂SiO₅ polymorphs and the presence of both in a rock tightly constrains the conditions of metamorphism. In this area, the peak metamorphic conditions correspond to depths of ~8 miles and temperatures of ~1100°F. Southwest side of Sagadahoc Bay, Georgetown.
Project Name: STATEMAP Phippsburg Bedrock24k

Exact Creation Date

4-14-2022

Location

Georgetown

Supplemental Rights

Credit must be given to the photographer and the Maine Geological Survey when this photo is displayed, reproduced, distributed and/or used in derivative works.