File:Hillsboro Sandstone (Lower Devonian; northwest of Sinking Spring, Ohio, USA) 13.jpg

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English: Sandstone from the Devonian of Ohio. (~4.5 centimeters across at its widest)

This is a sample from a rare stratigraphic unit in Ohio - the Hillsboro Sandstone. This is the first and only time I've ever encountered it. The yellowish-brown coloration is from iron oxide staining. Crack surfaces show that the iron oxide has penetrated portions of the interior. Unstained interiors are white, pure quartz sandstone. Clean, quartz-only sandstones are known as quartz arenites. Sand grains are angular to subangular, which is odd. I'd expect a mature sediment sample to consist of fairly rounded grains. It's possible that the angular shape of grains, as seen under a microscope, is due to pervasive quartz cement overgrowths. I can't discern rounded grain surfaces within the angular grains. A petrographic thin section would clarify this.

Stratigraphy: Hillsboro Sandstone, Lower Devonian (at least one reference considers the Hillsboro to be correlative with the upper Middle Devonian to lower Upper Devonian Blocher Member, but most references consider the Hillsboro to be Lower Devonian, and correlative with the Sylvania Sandstone)

Locality: northeastern corner of the Route 124-Woods Road intersection, northwest of the town of Sinking Spring, southeastern Highland County, southern Ohio, USA (39° 06' 12.36" North latitude, 83° 25' 48.29" West longitude)
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Source https://www.flickr.com/photos/47445767@N05/49426010406/
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@N05/49426010406 (archive). It was reviewed on 23 January 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

23 January 2020

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