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File:Crinoidal vuggy chert (Carboniferous; limestone quarry near Komsomolske, southeastern Ukraine) - 1.jpg

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Crinoidal vuggy chert (chertified crinoidal limestone) from the Carboniferous of Ukraine.

This visually intriguing rock is vuggy fossiliferous chert with a partial crinoid stem. Crinoids are marine, sessile, benthic, filter-feeding, stalked echinoderms (basically a starfish on a stick). The stem, or stalk, of a crinoid is the most commonly found part in the fossil record. The stem consisted of stacked columnals composed of calcite (CaCO3 - calcium carbonate). The crinoid stem seen here was originally in fossiliferous limestone that has been chertified. The rock is now composed of cryptocrystalline quartz. The calcitic crinoid stem material has dissolved away, leaving a mold.

Stratigraphy: undetermined.

Age: Carboniferous (possibly Tournaisian to lower Visean - Lower Mississippian to lower Middle Mississippian).

Locality: limestone quarry on the western side OR on just south of the town of Komsomolske (Komsomolskiy/Komsomolsky/Komsomolskoe), southeastern Ukraine.

Many fossils of shelly organisms (e.g., bivalves, gastropods, brachiopods, cephalopods) have had the original hard parts dissolved away. In such cases of dissolution, the fossil itself is an impression of the outside of the shell (external mold) or an impression of the inside of the shell (internal mold).
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Source Crinoidal vuggy chert (Carboniferous; limestone quarry near Komsomolske, southeastern Ukraine) 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@N05/15189037706. It was reviewed on 2 March 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

2 March 2015

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current21:41, 2 March 2015Thumbnail for version as of 21:41, 2 March 20152,156 × 1,932 (1.61 MB)Jacopo Werther (talk | contribs)Transferred from Flickr via Flickr2Commons

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