File:Mudchip breccia in sandstone (Logan Formation, Lower Mississippian; Rt. 35 roadcut, northeast of Rittenours, Ohio, USA) 3 (40044712565).jpg

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Mudchip breccia in sandstone in the Mississippian of Ohio, USA.

The Logan Formation of eastern Ohio is a Mississippian-aged, siliciclastics-dominated unit having four members (from the base upward): Berne Conglomerate Member, Byer Sandstone Member, Allensville Member, and the Vinton Member.

The grayish-colored structures shown above are thin, irregularly-shaped pieces of mudshale. The surrounding yellowish-rusty colored host rock is sandstone. Abundant mudshale chips in a host rock are referred to as mudchip breccias. Mudchip breccias and mudchips in sandstone form when erosion removes thin layers of previously-deposited muds, followed by transportation and deposition in coarser-grained sediments. Mudchips usually become aligned with the horizontal stratification. After burial, diagenesis, uplift, and erosion, mudchip-rich horizons tend to be readily exposed on split surfaces because they are planes of weakness.

Stratigraphy: float from the Logan Formation, Osagean, upper Lower Mississippian

Locality: Rittenours Outcrop - large roadcut on the northeastern side of Route 35, northeast of the town of Rittenours, Jefferson Township, southeastern Ross County, southern Ohio, USA (39° 13’ 46.29” North latitude, 82° 49’ 57.15” West longitude)
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Source Mudchip breccia in sandstone (Logan Formation, Lower Mississippian; Rt. 35 roadcut, northeast of Rittenours, Ohio, USA) 3
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@N05/40044712565 (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.

10 October 2019

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Date/TimeThumbnailDimensionsUserComment
current02:23, 10 October 2019Thumbnail for version as of 02:23, 10 October 20194,000 × 2,656 (6.89 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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