File:Dichocrinus ficus fossil crinoid (Edwardsville Formation, Lower Mississippian; Crawfordsville area, Montgomery County, western Indiana, USA) 1 (15115504487).jpg
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editDescriptionDichocrinus ficus fossil crinoid (Edwardsville Formation, Lower Mississippian; Crawfordsville area, Montgomery County, western Indiana, USA) 1 (15115504487).jpg |
Dichocrinus ficus Lyon & Casseday, 1862 fossil crinoid (total preserved length 4.35 cm) from the Mississippian of Indiana, USA. This is an articulated crown & stem of the relatively small crinoid species Dichocrinus ficus in fossiliferous calcisiltite from the famous Crawfordsville crinoid fauna in Indiana. The Crawfordsville crinoid fauna is well known for its abundance of exceptionally preserved, articulated fossil crinoids (& other echinoderms). This crinoid occurrence is one of the most spectacular on Earth. The Crawfordsville crinoid fauna contains at least 63 different crinoid species (Ausich, 1999), many of which are quite sizable. Classification: Animalia, Echinodermata, Crinoidea, Camerata, Monobathrida, Compsocrinina, Dichocrinidae Stratigraphy: Edwardsville Formation, Osagean Stage, upper Lower Mississippian Locality: near Crawfordsville, Montgomery County, western Indiana, 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. Reference cited: Ausich, W.I. 1999. Lower Mississippian Edwardsville Formation at Crawfordsville, Indiana, USA. pp. 145-154 in Fossil Crinoids. Cambridge, U.K. Cambridge University Press. |
Date | |
Source | Dichocrinus ficus fossil crinoid (Edwardsville Formation, Lower Mississippian; Crawfordsville area, Montgomery County, western Indiana, 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@N05/15115504487. 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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current | 19:01, 6 May 2015 | 634 × 1,460 (1.66 MB) | Natuur12 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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- File:Dichocrinus ficus (fossil crinoid) (Edwardsville Formation, Lower Mississippian; near Crawfordsville, Indiana, USA) 3 (15115504487).jpg (file redirect)
- File:Dichocrinus ficus fossil crinoid (Edwardsville Formation, Lower Mississippian; Crawfordsville area, Montgomery County, Indiana, USA) 1 (15115504487).jpg (file redirect)
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Pixel composition | RGB |
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Orientation | Normal |
Horizontal resolution | 800 dpi |
Vertical resolution | 800 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 18:35, 20 September 2014 |
Color space | Uncalibrated |
Image width | 634 px |
Image height | 1,460 px |
Date and time of digitizing | 14:33, 20 September 2014 |
Date metadata was last modified | 14:35, 20 September 2014 |