File:Palmichnium kosinskiorum (eurypterid tracks) (Pottsville Group, Lower Pennsylvanian; Spring Creek-Clarion River, Elk County, Pennsylvania, USA) 1 (45590671241).jpg
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Palmichnium kosinskiorum Briggs & Rolfe, 1983 - sea scorpion tracks in sandstone from the Pennsylvanian of Pennsylvania, USA. (CM 34388, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA) The eurypterids, or sea scorpions, are an extinct group of chelicerate arthropods. They have an elongated, scorpion-like body that could reach enormous sizes (2.5 to 3 meters!), with a nonmineralizing exoskeleton composed of chitinous material. They are generally found in shallow to very shallow water marine and marginal marine facies. Seen here is the holotype of Palmichnium kosinskiorum, the largest eurypterid trackway known. From museum exhibit signage: A Giant Sea Scorpion Trackway from western Pennsylvania Palmichnium kosinskiorum CM 34388 (Holotype) Briggs & Rolfe, 1983 Eurypterids, also known as sea scorpions, were one of the fearsome swimming predators of the Paleozoic seas (545-250 million years ago). This fossil was discovered by a former museum employee, James Kosinksi in 1948 along the Clarion River, Elk County, Pennsylvania. In 1983, English paleontologists Derek E.G. Briggs and W.D. Ian Rolfe described and named this specimen Palmichnium kosinskiorum. This eurypterid trackway is the largest known in the world. The 350 million-year-old fossil impressions record the footprints of an animal estimated to be more than seven and a half feet long. The shallow groove in the center of the trackway was caused by the animal's dragging tail, a possible indication of its amphibious movement between water and land. Classification: Animalia, Arthropoda, Chelicerata, Merostomata, Xiphosura, Eurypterida, Eurypteridae Stratigraphy: Pottsville Group, Pennsylvanian Locality: outcrop along Spring Creek-Clarion River, Elk County, northwest-central Pennsylvania, USA See info. at: <a href="https://en.wikipedia.org/wiki/Eurypterid" rel="nofollow">en.wikipedia.org/wiki/Eurypterid</a> and <a href="https://en.wikipedia.org/wiki/Palmichnium" rel="nofollow">en.wikipedia.org/wiki/Palmichnium</a> |
| Date | |
| Source | Palmichnium kosinskiorum (eurypterid tracks) (Pottsville Group, Lower Pennsylvanian; Spring Creek-Clarion River, Elk County, Pennsylvania, 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@N05/45590671241 (archive). It was reviewed on 6 November 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 04:45, 6 November 2018 | | 2,468 × 2,850 (7.05 MB) | Lu Brito (talk | contribs) | Transferred from Flickr via #flickr2commons |
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