File:Ferruginous chert (Boggs Member, Middle Pennsylvanian; ravine below Rt. 208, east of Dresden, Muskingum County, Ohio, USA) (30622479983).jpg

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Ferruginous chert from the Pennsylvanian of Ohio, USA. (~8.7 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 Boggs Member is a relatively thin stratigraphic interval in the Pottsville Group. It typically consists of marine fossiliferous limestones, dominated by brachiopods and crinoid ossicles. Significant lateral and vertical lithologic variation is present - the Boggs interval ranges from being a fossiliferous limestone to an intraclastic limestone to a chert to a dolostone. In places, it has a relatively high component of disseminated pyrite. In other places, it is relatively rich in black manganese oxide(s).

Minerals observed in the Boggs Limestone interval: calcite, dolomite, glauconite, goethite, gypsum, limonite, pyrite, sphalerite, turgite, vivianite, wad.

This is ferruginous chert from the Boggs Member. The yellowish-brown material is iron oxide.

Stratigraphy: Boggs Member, middle Pottsville Group, lower Atokan Stage, lower Middle Pennsylvanian

Locality: ravine below the southern side of Rt. 208 (= Dresden-Adamsville Road), east of the town of Dresden, Madison Township, Muskingum County, eastern Ohio, USA (= locality of Stout, 1918, p. 74, lines 8-13)

Reference cited:

Stout (1918) - Geology of Muskingum County. Geological Survey of Ohio, Fourth Series Bulletin 21. 351 pp.
Date
Source Ferruginous chert (Boggs Member, Middle Pennsylvanian; ravine below Rt. 208, east of Dresden, Muskingum County, Ohio, USA)
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@N05/30622479983. 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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current17:25, 24 June 2017Thumbnail for version as of 17:25, 24 June 20172,533 × 2,193 (4.06 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via Flickr2Commons

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