File:Fenestrate bryozoan in shale (Lower Mercer Shale, Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, Ohio, USA) (33344185135).jpg
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Fossil bryozoan from the Pennsylvanian of Ohio, USA. 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 rock shown above is a fossiliferous black shale from the Lower Mercer Shale, a marine unit that caps the Lower Mercer Limestone in the Pottsville Group. The lace-like fossil is a fenestrate bryozoan. Bryozoans are sessile, benthic, colonial, filter-feeding lophophorates. They first appear as fossils in the Late Cambrian. Most bryozoans constructed a calcareous skeleton, which is readily preserved in the fossil record. Fossil bryozoan skeletons are often highly fragmented. Classification: Animalia, Lophophorata, Bryozoa, Stenolaemata, Fenestrata Stratigraphy: Lower Mercer Shale (just above the Lower Mercer Limestone), Pottsville Group, lower Atokan Stage, lower Middle Pennsylvanian Locality: Rock Cut railroad cut - outcrop along the southern side of Ohio Central Railroad tracks (west of milepost 134), ~southwest of Copeland Island & south-southeast of the town of Dresden, northern Muskingum County, eastern Ohio, USA (~vicinity of 40° 04’ 24.41” North latitude, ~81° 59’ 11.25” West longitude) |
| Date | |
| Source | Fenestrate bryozoan in shale (Lower Mercer Shale, Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, 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@N05/33344185135. It was reviewed on 24 June 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:38, 24 June 2017 | | 1,767 × 1,403 (1.57 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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