File:Glacial polish on granite (Sierra Nevada Batholith, Cretaceous; Yosemite National Park, California, USA).jpg
![File:Glacial polish on granite (Sierra Nevada Batholith, Cretaceous; Yosemite National Park, California, USA).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/Glacial_polish_on_granite_%28Sierra_Nevada_Batholith%2C_Cretaceous%3B_Yosemite_National_Park%2C_California%2C_USA%29.jpg/800px-Glacial_polish_on_granite_%28Sierra_Nevada_Batholith%2C_Cretaceous%3B_Yosemite_National_Park%2C_California%2C_USA%29.jpg?20201013004741)
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Summary
[edit]DescriptionGlacial polish on granite (Sierra Nevada Batholith, Cretaceous; Yosemite National Park, California, USA).jpg |
English: (public display, Tuolumne Meadows visitor center, Yosemite National Park, California)
These shiny, striated surfaces are glacial polish. The rock itself is granite (or granodiorite), derived from an extensive, Cretaceous-aged intrusive complex in eastern California called the Sierra Nevada Batholith. The complex consists of numerous individual plutons, many of which are old, cooled magma chambers that were originally beneath ancient subduction zone volcanoes. Glacial erosion, smoothing, and polishing occurred during the Pleistocene Ice Age. Locality: unrecorded/undisclosed site in Yosemite National Park, Sierra Nevada Mountains, eastern California, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50039357146/ |
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@N05/50039357146. It was reviewed on 13 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
13 October 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:47, 13 October 2020 | ![]() | 1,500 × 1,125 (1.6 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50039357146/ with UploadWizard |
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Horizontal resolution | 150 dpi |
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Vertical resolution | 150 dpi |