File:Agaricocrinus sp. (fossil crinoid) (Fort Payne Formation, Lower Mississippian; Lake Cumberland, Kentucky, USA) 3 (34278163830).jpg

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Agaricocrinus sp. - chertified fossil crinoid head (oblique lateral view) from the Mississippian of Kentucky, USA.

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 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.

Multiple feathery, filter-feeding arms (missing) originally attached at the distal ends of the five prominent projections.

Orientation: the viewer is facing the C-D interray (= posterior side)

Classification: Animalia, Echinodermata, Crinoidea, Camerata, Monobathrida, Compsocrinina, Coelocrinidae

Stratigraphy: Fort Payne Foramtion, upper Osagean Stage, upper Lower Mississippian

Locality: lakeside exposure at Gross Creek West, southwestern side of Gross Creek, far-southern part of the Indian Creek arm of southwestern Lake Cumberland, northern Clinton County, southern Kentucky, USA
Date
Source Agaricocrinus sp. (fossil crinoid) (Fort Payne Formation, Lower Mississippian; Lake Cumberland, Kentucky, USA) 3
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/34278163830. It was reviewed on 12 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

12 October 2019

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current04:02, 12 October 2019Thumbnail for version as of 04:02, 12 October 20191,795 × 1,456 (1.58 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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