File:Catellocaula vallata bioimmuration structure in a fossil bryozoan (Kope Formation, Upper Ordovician; Route 9 roadcut near Alexandria, Kentucky, USA).jpg
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English: Catellocaula vallata Palmer & Wilson, 1988 - bioimmuration structure in a fossil bryozoan from the Ordovician of Kentucky, USA. (1.5 centimeters across at its widest)
This specimen is from the famous Cincinnatian Series of the tristate area of Ohio-Kentucky-Indiana. Rocks in the Cincinnatian were deposited in relatively shallow marine facies during the Late Ordovician. The Cincinnatian succession is mostly interbedded limestones and shales. Most of the limestones are event beds (= tempestites), deposited during ancient storms. This is a trepostome bryozoan colony. Bryozoans are sessile, benthic, filter-feeding, colonial lophophorates. Most of them make calcareous skeletons. The irregularly-shaped pits are not part of the bryozoan's normal skeletal structure. These are bioimmuration structures - the bryozoan slowly grew over soft-bodied encrusters attached to its surface. This specific type of bioimmuration structure has been named Catellocaula vallata, a trace fossil formed by a bryozoan growing around an encrusting colonial tunicate (Animalia, Chordata, Urochordata / Tunicata) (= "sea squirts"). Well-formed Catellocaula specimens have stellate-shaped pits. Stratigraphy: Kope Formation, Edenian Stage, lower Cincinnatian Series, Upper Ordovician Locality: roadcut along the northeastern side of the AA Highway (= Rt. 9) at the Rt. 409/Thelma Lee Road intersection, near the town of Alexandria, central Campbell County, northern Kentucky, USA (38° 49' 22.40" North latitude, 84° 23' 44.36" West longitude) See info. at: strata.uga.edu/cincy/fauna/tracefossils/Catellocaula.html and en.wikipedia.org/wiki/Bioclaustration |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/31337957971/ |
| 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@N05/31337957971. 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 | 15:44, 30 November 2020 | | 1,737 × 1,108 (1.09 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/31337957971/ with UploadWizard |
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