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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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Illusory erect spines(?) on a Kimmswick receptaculitid
pefty posted a topic in General Fossil Discussion
UPDATE: These seem to just be weirdly incomplete cross-sections through ordinary cylindrical meroms. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ This weekend in the Kimmswick Limestone in eastern Missouri (Pike County) I saw plenty of receptaculitid algae, mostly of genus Fisherites. But one cross-section has a feature I've never seen before: a fringe of what look like erect spines on the external surface. Can someone point me to a reference for understanding this feature functionally and/or taxonomically? I've looked in the usual places but I d -
Very odd little fossil found today in the Mississippian Warsaw Formation of St Louis County, Missouri, USA. All insights appreciated.
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My fossil hunting friend came across this object in a creek in eastern Missouri. At first glance this ~1 cm diameter ball with stout spikes would seem to be some sort of camerate crinoid, but the spikes cover the entire surface, with no apparent place to put arms, column, mouth, or anus. (Side note: That must be the crinoid folksong community's version of "Head, Shoulders, Knees, and Toes.") From there my fallback would be coral, or perhaps sponge, but the complete coverage around the whole sphere (see attached video) has me a bit baffled. The creek flows through mostly Meramecian
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