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Showing results for tags 'katian'.
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Hello, this slab is from the Kope Formation, particularly Upper Alexandria sub-member within Delhi Township, Ohio. I am unsure if these rounded "structures" are bryozoans, echinoderms, or brachiopods, but i'm leaning more toward bryozoans. Fauna on the slab include: -Cincinnaticrinus, Ectenocrinus -Retrosirostra OR Dalmanella (hard to distinguish) -Bythopora -Isotelus, Flexicalymene -Ambonychia If anyone has an idea as to what the round objects are, please comment! Thank you! EDIT: I now believe these are individual cephalopod chambers that were filled with hash. I credit a fellow UC student!!! Now I wonder if anyone else thinks similarly.
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- edenian
- identification
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Echinoderm identification help please! Polished cross-section in the Kimmswick Limestone (Late Ordovician: Katian; Missouri, USA) used as facing stone at Missouri Botanical Garden. Possibly the paracrinoid Implicaticystis (once known as Comarocystites)? Specimen is ~25 mm across.
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Taxonomy from Sumrall & Zamora 2011. Diagnosis (Sumrall & Zamora 2011, p. 441): "Large Isorophus with moderately curved ambulacra and proportionately wide peripheral rim." Identified by oilshale using Sumrall & Zamora 2011. References: Sumrall, Colin D. & Zamora, Samuel (2011) Ordovician edrioasteroids from Morocco: faunal exchanges across the Rheic Ocean. Journal of Systematic Palaeontology, Vol. 9, Issue 3, September 2011, 425–454.
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I wonder if this is some animal or just a crystal formation. The surface is extremely smooth, when I touch it with my finger. The formation is from Late Ordovician. Pict. 1 Pict.2 Pict.3 Pict.4
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Synonym: Pleurocystites robustus Billings, 1854. Alternative spelling: Pleurocystis. Taxonomy from fossilworks.org. Diagnosis (Sprinkle et al., 1985): “Theca rounded-triangular, nearly symmetrical; 3 rhombs elliptical, dichopores occupying less than 40% of sutures; periproct occupying 70% of lower side, about 680-700 periproctals, no rectal lobe, anal pyramid away from margin; ornament composed of medium growth lines and few ridges radiating to the plate sides and corners; brachioles having large groove extending up aboral side, cover plates fairly large; proximal stem slowly tapering and moderately ridged.” ID determined by oilshale. Reference: Billings, E. (1874). Paleozoic Fossils, v. II, pt. I. Canada Geological Survey 1-144 Parsley, R. L. (1970). Revision of the North American Pleurocystitidae (Rhombifera-Cystoidea). Bulletins of American Paleontology 58:135-213. Sprinkle, J., Henry, L., Zimmer, F., Kelley, L., & Whiteley, J. (1985). New Pleurocystites from the Bromide Formation of Oklahoma. Journal of Paleontology, 59(6), 1476-1480. Brower, J. (1996). Growth and Functional Morphology of Pleurocystites Squamosus Billings, An Ordovician Rhombiferan Echinoderm. The Paleontological Society Special Publications, 8, 48-48. doi:10.1017/S2475262200000502 Paton, T. (2017). Paleo Pompeii; Genesis and Preservation of an Upper Ordovician Mounded Hardground with a Diverse Encrusting Community. Master-thesis, University of Cincinnaty. Paton, T. and Brett, C. E. (2019). Revised stratigraphy of the middle Simcoe Group (Ordovician, upper Sandbian-Katian) in its type area: An integrated approach. Canadian Journal of Earth Sciences 57(1).
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Nice specimen of this interesting trilobite. The species name titan refers to this species being significantly bigger than the Czech typespecies Declivolithus alfredi. The distinctive head-shape of this suspension feeder shows this trilobite was probably adapted to fast swimming. Here's a paper describing the new species and the type locality: http://www.geology.cz/bulletin/fulltext/1649_Fortey_170930.pdf
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- declivolithus
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From the album: Nautiloidea
13cm. long. With an Ambonychia radiata bivalve attached. Katian Georgian Bay Formation Late Ordovician Found near the mouth of the Etobicoke Creek in Greater Metropolitan Toronto.- 3 comments
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From the album: Nautiloidea
9cm. From the Ordovician Katian stage of the Georgian Bay Formation.Found in Etobicoke Creek near Toronto.-
- katian
- ordovician
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