File:Catellocaula vallata in bryozoan (Kope Formation, Upper Ordovician; Route 52 roadcut, Hamilton County, Ohio, USA).jpg
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English: Catellocaula vallata Palmer & Wilson, 1988 - bioimmuration structures in a bryozoan colony from the Ordovician of Ohio, USA.
This fossil 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. They are not borings (drillholes), but pseudoborings. Specifically, these depressions and grooves are bioimmuration structures - the bryozoan slowly grew over one or more soft-bodied encrusters attached to its surface. This particular type of bioimmuration structure is 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 scalloped to stellate-shaped pits. Stratigraphy: float from the Fulton Member, lower Kope Formation, lower Edenian Stage, lower Cincinnatian Series, Upper Ordovician Locality: roadcut along the northern side of Route 52, ~0.7 miles west of Asbury Road, along the Ohio River's northern shore & southeast of Interstate 275, southern margin of Anderson Township, southeastern Hamilton County, southwestern Ohio, USA (vicinity of 39° 02’ 37" North latitude, 84° 22’ 01" 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@N05/49990900707/ |
| 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@N05/49990900707. 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 | 15:45, 30 November 2020 | | 1,666 × 1,272 (1.77 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49990900707/ with UploadWizard |
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