Title

Bedrock Bristol Photo 8

Creator

David P. West Jr.

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Contributing Institution

Maine Geological Survey

Document Type

Image

Identifier

69768

Description

Photo 8: Alternating layers of light gray feldspathic and micaceous quartz-rich granofels (bottom) and darker gray sillimanite-rich mica schist (top) of the Cape Elizabeth Formation (Oce) of the Casco Bay Group. Prior to metamorphism, these were alternating beds of quartz-rich sand and fine-grained mudstone. Sillimanite (white knots in the upper layer) is an aluminous metamorphic index mineral whose presence indicates these rocks were once heated to over 900°F during metamorphism. Plummer Point, Damariscotta River, South Bristol.
Project Name: STATEMAP Bristol Bedrock24k

Exact Creation Date

7-30-2021

Location

South Bristol

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.