File:Glaciated knob of gneiss (Proterozoic; Port Leyden, western Adirondacks, New York Sate, USA) 1 (27008031418).jpg
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| Description |
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. |
| Date | |
| Source | Glaciated knob of gneiss (Proterozoic; Port Leyden, western Adirondacks, New York Sate, USA) 1 |
| 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@N05/27008031418 (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. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:21, 2 December 2019 | | 4,288 × 2,848 (5.93 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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