File:Gneiss (Ellsworth Schist, Cambrian; Seal Cove, Mt. Desert Island, Maine, USA) 13.jpg

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English: Gneiss in the Cambrian of Maine, USA.

Gneiss is a foliated, high-grade metamorphic rock. It consists of alternating layers of light and dark minerals. Light-colored layers are usually dominated by quartz and/or feldspar. Dark colored layers are often rich in biotite mica.

Geologic unit: Ellsworth Schist, Cambrian (published isotopic dates include 499 and 509 Ma)

Locality: seaside exposure at public boat ramp at Seal Cove, western Mt. Desert Island, southern-coastal Maine, USA
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Source https://www.flickr.com/photos/47445767@N05/50033914027/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50033914027. It was reviewed on 25 August 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

25 August 2020

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current06:12, 25 August 2020Thumbnail for version as of 06:12, 25 August 20203,008 × 2,000 (5.22 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50033914027/ with UploadWizard

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