File:Plumose marking on joint surface in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 2 (23733446026).jpg
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| Description |
Joints are fractures in rocks along which no differential displacement has occurred. This distinguishes them from faults, along which displacement has taken place. Some joint surfaces have feathery-like features called plumose markings. They consist of an axis and small-scale, radiating-outward ridges. The divergent-direction axis points toward the direction of fracture propagation. Host rocks: tholeiitic basalt, Clam Falls Volcanics, upper Mesoproteozoic, ~1.1 Ga Locality: outcrops above the western banks of the St. Croix River, Interstate State Park, Taylors Falls, eastern Chisago County, eastern Minnesota, USA |
| Date | |
| Source | Plumose marking on joint surface in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 2 |
| Author | James St. John |
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/23733446026 (archive). It was reviewed on 10 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 | |
|---|---|---|---|---|---|
| current | 00:22, 10 October 2019 | | 4,000 × 3,000 (5.82 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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