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File:Fossiliferous sandstone (Byer Sandstone Member, Logan Formation, Lower Mississippian; east-central Ohio, USA) 1 (46489339344).jpg

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Fossiliferous sandstone from the Mississippian of Ohio, USA. (~12.2 centimeters across at its widest near the base)

The Byer Sandstone is one of four stratigraphic units in the Mississippian-aged, siliciclastics-dominated Logan Formation of eastern Ohio. Ascending from the base, they are the Berne Conglomerate Member, the Byer Sandstone Member, the Allensville Member, and the Vinton Member.

This is a bedding plane view of a quartzose sandstone sample derived from the Byer Sandstone. The abundant structures are crinoid fossils, which are common in the Byer. I don't think I see anything else in this rock except crinoids - maybe one small fragmentary brachiopod shell.

Crinoids (sea lilies) are sessile, benthic, filter-feeding, marine invertebrates related to starfish. A crinoid is essentially a starfish on a stick. The stick, or stem, or stalk, consists of stacked poker chip-like structures called columnals. The hard parts of the crinoid skeleton are composed of calcite. The crinoid columnals shown above are preserved as external molds - the calcite has been dissolved away. The yellowish-brown to dark brown coloration of the rock is from one or more iron oxides (limonite and/or goethite?)

Classification: Animalia, Echinodermata, Crinoidea

Stratigraphy: Byer Sandstone Member, Logan Formation, Waverly Group, Osagean Stage, upper Lower Mississippian

Locality: unrecorded, but probably east-central Ohio, USA (possibly Licking County)
Date
Source Fossiliferous sandstone (Byer Sandstone Member, Logan Formation, Lower Mississippian; east-central Ohio, USA) 1
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@N05/46489339344 (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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current02:23, 10 October 2019Thumbnail for version as of 02:23, 10 October 20194,958 × 4,441 (15.03 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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