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Found 15 results

  1. So...... let's say I wanted to collect one specimen of each class of echinoderms (yes, the classes are always in flux, I know). Not a great specimen, just some ossicle or fragment easily determinable to be a member of that class for each class. It would be a fun trip around the world going to a set of localities, each of which was the easiest place in the world to find specimens of some particular echinoderm class. Some classes (crinoids, echinoids) seem almost too easy; others (blastoids, cyclocystoids, paracrinoids) are hard in some parts of the world but trivially easy here in eastern Missouri, USA. But more obscure classes of echinoderms (ctenocystoids, cinctans, solutans, stylophorans) seem to be hard to find no matter where you go; for each of these, I'm curious what formation / location would be the *least* hard. So let's start with a weird one: Where in the world is it *least difficult* to find a fossil readily determinable as belonging to an ophiocistioid?
  2. bockryan

    Crinoidea

    From the album: Fossil Collection: DC Area and Beyond

    Crinoidea Romney, WV Tonoloway Formation and Helderberg Group Late Silurian/Early Devonian
  3. bockryan

    Crinoidea

    From the album: Fossil Collection: DC Area and Beyond

    Crinoidea Penn Dixie Fossil Park & Nature Preserve, NY Moscow Formation Middle Devonian
  4. bockryan

    Crinoidea

    From the album: Fossil Collection: DC Area and Beyond

    Crinoidea Maysville Roadcut, KY Kope, Fairview, and Bellevue Formations Ordovician
  5. Fullux

    Crinoidea

    Howdy all, Been finding some crinoid stems in my usual spot in the Drakes Formation and I'm wanting an ID on them. They look similar to stems from Agaricocrinus americanus from the Carboniferous of the eastern U.S., though they were found in an upper Ordovician deposit. Any ideas?
  6. Bill Dye The Travis Guy

    Crinoid ID Help

    Hello! Looking to see if anyone can tell me what species these crinoids are! It was found in O’Fallon, Missouri. Mississippian Period limestone rock outcropping (road cut). Specific location: (38.8189493, -90.7276743) These are the same fossil ^^^^ These three are the same^^^
  7. Marco90

    Scyphocrinites elegans

    From the album: My collection in progress

    Scyphocrinites elegans Zenker 1883 Location: Boutschrafin, Erfoud, Morocco Age: 420 Mya (Pridoli, Silurian) Measurements: 20x12 cm (plate) Kingdom: Animalia Phylum: Echinodermata Subphylum: Crinozoa Class: Crinoidea Subclass: Camerata Order: Monobathrida Family: Scyphocrinitidae
  8. We've been finding these oddball puffy stars in the Late Ordovician (Sandbian) of eastern Missouri (Illinois Basin), in the uppermost part of the Plattin Group (a Platteville equivalent) or possibly the lowermost part of the Decorah Group (Katian). We've been finding a lot of weird fossils in that zone, including articulated cyclocystoids, but these I'm at a loss on. They seem to be calcite and preserve in the same texture and color as other echinoderm material in the same rock. They vary in convexity and in the presence of a central hump or divot, but there never seems to be a lumen that goes all the way through as far as I can tell. Some possibilities: stelleroid crinoid (but where anatomically? cystoid (but where anatomically? Up for other ideas or insights. Seen anything like this before?
  9. A friend uncovered this oddball today in the Late Ordovician (Sandbian) of eastern Missouri, in the uppermost part of the Plattin Group (a Platteville equivalent) or possibly the lowermost part of the Decorah Group. He's been finding a lot of weird fossils in that zone, including articulated cyclocystoids, but this one I'm at a loss on. Too wobbly for an orthoconic cephalopod, too much space between calcite elements for a crinoid column. Given the size, is machaeridian a possibility? What other ideas should we be considering?
  10. Help request! I am putting together a tool for judging rock age based on very crude, whole-rock, hand-sample observations of fossil faunas/floras -- the types of observations a child or beginner could successfully make. I view this as a complement to the very fine, species-level identifications commonly employed as index fossils for individual stages, biozones, etc. Attached is what I've got so far, but I can clearly use help with corals, mollusks, plants, vertebrates, ichnofossils, and the post-Paleozoic In the attached file, vibrant orange indicates times in earth history to commonly observe the item of interest; paler orange indicates times in earth history to less commonly observe the item of interest. White indicates very little to no practical probability of observing the item of interest. Please keep in mind that the listed indicators are things like “conspicuous horn corals,” purposefully declining to address rare encounters with groups of low preservation potential, low recognizability, etc. Got additions/amendments, especially for the groups mentioned above? Toss them in the comments below! Thank you..... https://docs.google.com/spreadsheets/d/1tVm_u6v573V4NACrdebb_1OsBEAz60dS1m4pCTckgyA
  11. Greetings, all! I am currently writing a thesis involving fossils from the Burlington Limestone near its type section along the Illinois/Iowa border. To demonstrate the diversity of the crinoidal remains from the limestone (over 400 species have been described from the Burlington alone!), I am looking for photographs of articulated crinoids. Do any of you have any that you would like to let me include in my thesis? If possible, I would like high-res images of crinoids identified to genus or species with a scale bar/ruler present in the image as well as the collection/locality info. I can't guarantee that I will use every image posted, but if I use your image, then I will acknowledge you in my acknowledgements and give you credit for the image. Thank you for your time & assistance! -Elasmohunter
  12. This specimen belongs to a set of 9 specimens kindly presented by a good friend. Thank you to doushantuo for the link to Roux et al. (2019) paper.
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