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Contributing Institution
Maine Geological Survey
Document Type
Image
Identifier
70100
Description
Photo 8: Dark gray amphibolite in the Casco Bay Group (Ocba). These rocks are dominated by the minerals hornblende and plagioclase feldspar and are interpreted to represent metamorphosed mafic (basaltic) igneous rocks. The elongate white boudins in the amphibolite are remnants of a younger granite sill that intruded the amphibolite and was then later pulled apart during ductile deformation. Amphibolite is also present in the Cape Elizabeth Formation (Ocea). Inner Heron Island, South Bristol.
Project Name: STATEMAP Pemaquid Point Bedrock24k
Exact Creation Date
9-16-2021
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.
Keywords
bedrock mapping; STATEMAP; outcrop