File:Plumose marking on joint surface in limestone (Columbus Limestone, Middle Devonian; Seneca Caverns, Ohio, USA).jpg

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English: 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 rock: Columbus Limestone, Middle Devonian

Locality: trailside, Level 3 of Seneca Caverns, just south of Flat Rock Quarry & south-southwest of the town of Bellevue, northern Ohio, USA
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Source https://www.flickr.com/photos/47445767@N05/52274328855/
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@N05/52274328855. It was reviewed on 7 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 November 2022

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current23:38, 7 November 2022Thumbnail for version as of 23:38, 7 November 20222,839 × 1,810 (2.92 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52274328855/ with UploadWizard

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