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Contributing Institution
Maine Geological Survey
Document Type
Image
Identifier
70099
Description
Photo 7: Medium gray biotite gneiss in the Casco Bay Group (Ocbg). These rocks are restricted to the eastern side of Inner Heron Island and do not correlate well with any rock types found on the mainland. The mineralogy of these rocks (plagioclase feldspar, biotite ± quartz and hornblende), along with a close association with amphibolite (Ocba) suggests they may represent deformed and metamorphosed igneous rocks of intermediate silica composition. 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