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File:Stigmaria fossil root (underclay below the Bedford Coal, Middle Pennsylvanian; Tunnel Hill North Portal Outcrop, Coshocton County, Ohio, USA) 2 (30200695164).jpg

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Stigmaria fossil root from the Pennsylvanian of Ohio, USA. (9.4 cm across at its widest)

The Pottsville Group is a Pennsylvanian-aged cyclothemic succession in eastern Ohio that contains nonmarine shales, marine shales, siltstones, sandstones, coals, marine limestones, and chert ("flint"). The lower Pottsville dates to the late Early Pennsylvanian. The upper part dates to the early Middle Pennsylvanian. The Lower-Middle Pennsylvanian boundary is apparently somewhere near the Boggs Member (?).

The fossil shown above is from a weathered clay horizon just below a coal in the Pottsville Group. This is Stigmaria, a relatively common tree root fossil in Pennsylvanian-aged nonmarine sedimentary rocks. Portions of the original wood have been carbonized (coalified).

Classification of Stigmaria: Plantae, Lycophyta, Lepidodendrales, Lepidodendraceae

Stratigraphy: underclay just below the Bedford Coal (= just below the Upper Mercer Limestone/Flint), Pottsville Group, lower Middle Pennsylvanian

Locality: Tunnel Hill North Portal Outcrop (= Noland Tunnel's northern portal), ~1.75 air miles north-northeast of the town of Tunnel Hill, western Coshocton County, eastern Ohio, USA (~40° 16’ 33.27” North latitude, ~82° 01’ 53.04” West longitude)
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Source Stigmaria fossil root (underclay below the Bedford Coal, Middle Pennsylvanian; Tunnel Hill North Portal Outcrop, Coshocton County, Ohio, USA) 2
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@N05/30200695164. It was reviewed on 24 June 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

24 June 2017

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current17:21, 24 June 2017Thumbnail for version as of 17:21, 24 June 20173,664 × 1,675 (4.32 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via Flickr2Commons

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