File:Potholes (Presque Isle River, Porcupine Mountains State Park, Upper Peninsula of Michigan, USA) (21466113862).jpg
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Summary
| Description |
The rounded pits are potholes - some of the best I've ever seen. Potholes principally form by abrasive erosion by sediments (sand & gravel) moving in eddies within pre-existing bedrock depressions. The rocks are dark-colored mudshales of the Precambrian-aged Nonesuch Shale. Stratigraphy: Nonesuch Shale, middle Oronto Group, upper Keweenawan Supergroup, upper Mesoproterozoic Locality: lower Presque Isle River, Porcupine Mountains State Park, Upper Peninsula of Michigan, USA |
| Date | |
| Source | Potholes (Presque Isle River, Porcupine Mountains State Park, Upper Peninsula of Michigan, USA) |
| Author | James St. John |
Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/21466113862 (archive). It was reviewed on 28 January 2020 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 | 02:11, 28 January 2020 | | 1,280 × 960 (1.11 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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