File:Harney Peak Granite (late Paleoproterozoic, 1.695 to 1.715 Ga; Needles, Black Hills, South Dakota, USA) (38366807454).jpg
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| Description |
Granite in the Precambrian of South Dakota, USA. (video clip by Lee St. John) This shows the landscape at the Needles, in the Black Hills of South Dakota. The Black Hills Uplift formed during the Laramide Orogeny, along with the true Rocky Mountains of western America. The Laramide Orogeny was a mountain building event that took place during the Cretaceous and Tertiary. The Black Hills themselves were uplifted during the Paleocene and Eocene (= early Tertiary), at about 64 to 40 million years ago. The Black Hills are cored by Precambrian basement rocks (igneous & metamorphic) and flanked by structurally tilted Paleozoic sedimentary rocks. In the surrounding prairielands are Mesozoic and Cenozoic sedimentary rocks. The Needles are erosional pillars in the Precambrian-aged Harney Peak Granite. It formed from cooling magma deep underground at 1.695 to 1.715 billion years ago. The Harney Peak Granite intruded through metamorphic rocks (not seen here) - principally quartz-mica schists. Locality: view from Route 87 (= Needles Highway), central Black Hills, western South Dakota, USA (Looking north & northeast from: 43° 50' 32.04" North latitude, 103° 32' 12.24" West longitude) |
| Date | |
| Source | Harney Peak Granite (late Paleoproterozoic, 1.695 to 1.715 Ga; Needles, Black Hills, South Dakota, USA) |
| 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@N05/38366807454 (archive). It was reviewed on 22 October 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 | |
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| current | 05:57, 22 October 2019 | | 1,440 × 1,080 (263 KB) | Rudolphous (talk | contribs) | Transferred from Flickr via #flickr2commons |
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