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File:Collapse breccia (Everton Formation, Middle Ordovician; Rush Creek District, Arkansas, USA) 2.jpg

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English: Collapse breccia from the Ordovician of Arkansas, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

Breccia is a poorly sorted rock having angular large grains. Breccias form many ways - examples range from igneous to sedimentary to metamorphic (e.g., volcanic breccia, xenolith breccia, boiling breccia, landslide breccia, seismite breccia, karst collapse breccia, mudchip breccia, pedogenic breccia, hydrothermal breccia, injectite breccia, tectonic breccia/fault breccia, impact breccia, etc.). The rock shown here is a carbonate collapse breccia from Arkansas. It formed when a subsurface dissolutional void (= karst cavity; = cave) collapsed.

Stratigraphy: Everton Formation, Middle Ordovician

Locality: unrecorded/undisclosed site attributed to the Rush Creek District, Marion County, northern Arkansas, USA
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Source https://www.flickr.com/photos/47445767@N05/39887278460/
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@N05/39887278460 (archive). It was reviewed on 15 February 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 February 2020

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current18:29, 15 February 2020Thumbnail for version as of 18:29, 15 February 20203,849 × 2,288 (6.32 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

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