File:Dendrocrinus caduceus fossil crinoid (Waynesville Formation, Upper Ordovician; Caesar Creek Lake's emergency spillway, northeastern Warren County, southwestern Ohio, USA) 1 (15301593062).jpg

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Dendrocrinus caduceus (Hall, 1866) fossil crinoid from the Ordovician of Ohio, USA.

This is a rare fossil - it’s the head of the cladid crinoid Dendrocrinus caduceus (Hall, 1866). The arms have been detached, so what remains is called the cup.

Height of preserved cup = ~9.5 mm Diameter of cup base = ~2 mm Diameter of top of preserved cup = ~7 mm to ~9 mm (slightly compressed)

Classification: Echinodermata, Crinoidea, Cladida, Dendrocrinidae

Stratigraphy: float from the upper Waynesville Formation, Richmondian Stage, upper Cincinnatian Series, upper Upper Ordovician

Locality: loose piece from “flats” of Caesar Creek Lake’s emergency spillway, southwestern side, ~2/3-of-the-way between Clarksville Road & Roaring Run, northeastern Warren County, southwestern Ohio, 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 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.
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Source Dendrocrinus caduceus fossil crinoid (Waynesville Formation, Upper Ordovician; Caesar Creek Lake's emergency spillway, northeastern Warren County, southwestern Ohio, USA) 1
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15301593062. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2015

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current19:00, 6 May 2015Thumbnail for version as of 19:00, 6 May 2015709 × 976 (475 KB)Natuur12 (talk | contribs)Transferred from Flickr via Flickr2Commons

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