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Contributing Institution
Maine Geological Survey
Document Type
Image
Identifier
70116
Description
Photo 10: Hornblende gneiss of the Casco Bay Group amphibolite (Ocba). The darker layers are dominated by the minerals hornblende (an amphibole group mineral) and plagioclase feldspar. The lighter green layers are calc-silicate rocks rich in diopside (a pyroxene group mineral) and calcic plagioclase feldspar. This unit contains both unlayered amphibolites which are interpreted to represent metamorphosed mafic (basaltic) igneous rocks, as well as amphibolite calc-silicate gneisses that may represent metamorphism of layered impure carbonate sediment. Pig Cove, Southport Island.
Project Name: STATEMAP Boothbay Harbor Bedrock24k
Exact Creation Date
10-5-2021
Location
Southport
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; outcrop; STATEMAP