File:Crinoid stems (Kope Formation, Upper Ordovician; Rt. 9 roadcut near Alexandria, Kentucky, USA).jpg
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English: Fossil crinoid stems from the Ordovician of Kentucky.
Crinoids (sea lilies) are sessile, benthic, filter-feeding, stalked echinoderms that are relatively common in the marine fossil record. Crinoids are also a living group, but are relatively uncommon in modern oceans. A crinoid is essentially a starfish-on-a-stick. The stick, or stem, is composed of numerous stacked columnals, like small poker chips. Stems and individual columnals are the most commonly encountered crinoid fossils in the field. Intact, fossilized crinoid heads (crowns, calices, cups) are unusual. Why? Upon death, the crinoid body starts disintegrating very rapidly. The soft tissues holding the skeletal pieces together decay and the skeleton falls apart. Shown here are specimens of partially articulated crinoid stems, weathered and eroded free from the original host rock. Multiple species are here: Iocrinus subcrassus, Ectenocrinus simplex, Cincinnaticrinus varibrachialus, plus some undetermined species. Some of these crinoid stems are encrusted with pimple bryozoans, Corynotrypa inflata cyclostome bryozoans, Cornulites worm tubes, and Sphenothallus holdfasts. Stratigraphy: Kope Formation, Edenian Stage, lower Cincinnatian Series, Upper Ordovician Locality: roadcut along the northeastern side of Rt. 9 (= AA Highway) at the Rt. 409/Thelma Lee Road intersection, near the town of Alexandria, central Campbell County, northern Kentucky, USA. (38° 59' 22.40" North latitude, 84° 23' 44.36" West longitude) See info. at: en.wikipedia.org/wiki/Crinoid |
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| Source | https://www.flickr.com/photos/47445767@N05/30866297003/ |
| 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@N05/30866297003. It was reviewed on 30 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 15:45, 30 November 2020 | | 3,134 × 2,387 (4.92 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/30866297003/ with UploadWizard |
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