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File:Gneiss (Proterozoic; Port Leyden, western Adirondacks, New York Sate, USA) 2 (27007949648).jpg

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Gneiss in the Precambrian of New York State, USA.

Gneiss is a relatively common, foliated-textured, high-grade metamorphic rock. It consists of alternating bands of light and dark minerals. The precursors to gneiss are generally schist, granite, or granite-like rocks.

The outcrop shown here is a glaciated knob of Proterozoic-aged gneiss in Port Leyden, New York. According to Darling & Florence (1995), the gneisses of this area vary considerably in mineral content. Glacial erosion of the region occurred during the Pleistocene Ice Age.

Locality: southern side of North Street, eastern side of the town of Port Leyden, just west of the Black River, western Adirondacks, southern Lewis County, north-central New York State, USA (~43° 35’ 07.32” North latitude, ~75° 20’ 30.48” West longitude)

Reference cited:

Darling & Florence (1995) - Apatite light rare earth element chemistry of the Port Leyden nelsonite, Adirondack Highlands, New York: implications for the origin of nelsonite in anorthosite suite rocks. Economic Geology 90: 964-968.
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Source Gneiss (Proterozoic; Port Leyden, western Adirondacks, New York Sate, USA) 2
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/27007949648 (archive). It was reviewed on 2 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

2 December 2019

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current06:21, 2 December 2019Thumbnail for version as of 06:21, 2 December 20192,848 × 4,288 (6.16 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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