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  1. Thomas1982

    Mahantango Crinoid

    From the album: Mahantango Formation

    Crinoid Calyx Schuylkill County, Pennsylvania
  2. There are a lot of crinoid fossils coming out of China these days, particularly this good sized and photogenic species. I believe it is called Traumatocrinus, perhaps named after a famed paleontologist who was killed during WWII. By far, most available fossils are a side view of the calyx and arms. I was interested in acquiring specimens that clearly show the echinoderm geometry on the aboral surface of the calyx. I was also interested in some view of the oral surface, which is usually hidden behind a blizzard of arms and branching pinnules. The crinoid has a pentaradial symmetry with two arms on each for a total of 10 arms. The green outline shows one of the five structures that make a five pointed "star". The oral surface is less visible. One can see plate-like structures in the center but I can't detect a mouth, hydropore or anus.
  3. Thomas1982

    Megistocrinus depressus

    From the album: Mahantango Formation

    Megistocrinus depressus (left) and an unidentified calyx Perry County, Pennsylvania
  4. Collector9658

    Undetermined crinoid calyx

    From the album: Mississippian fossils

    An intriguing crinoid calyx from the Chouteau Formation of central Missouri, likely Aacocrinus boonensis . I'll clean and ID this specimen properly later this year.
  5. Collector9658

    Crinoid ID, Agaricocrinus pracursor?

    Today I went through some piles of weathering Fern Glen limestone I have outside, and I found the cutest little calyx. First thought was it was a chunk of stem, but after chipping it out of the rock that was definitely not the case. I compared it to some literature I had on hand, and believe it is small Agaricocrinus pracursor crinoid calyx. I Would like some second opinions. Unfortunately I don't have an air abbraider to clean this calyx further and it being so small as well as ironstained makes it tough to photograph well with my old phone, so I will add a couple more photos than usual. Thanks as always. -Jay
  6. Tales From the Shale

    Grant County Wisconsin- 7/7/23

    Age: Ordovician: Approx. 454-452 Mya Formation: Decorah Shale Location Grant County, Wi Amidst the frequent outcroppings of Platteville Limestone in Southern Wisconsin, you occasionally encounter the overlying Decorah Shale. From what I read this formation is more frequent north of Grant County, and in Minnesota as well. The outcrop itself is roughly 200 feet in length, and only extends about 6 feet from the ground. Its located in a very remote area, amongst a sea of corn fields. Here are a couple finds from my third trip to this locality. Here is a complete crinoid calyx with associated pinnule filtering appendages. Complete crinoids are much more common in Silurian/Devonian stratum. Next is a hashplate, with a few assorted brachiopods and crinoid fragments. There were also a handful of brachiopods to be found alone as well. All of these are very similar to the Ordovician Lepidocyclus perlamellosa/H. capax. Although these were much smaller in size. A single Lingula inarticulate brachiopod, which was a huge surprise since this was my first one ever. I found a mid sized orthoconic nautiloid. This one is 7 inches (17.7 cm) in length. The approximate width at its widest end is 2 3/4 (6.9 cm). Note the visible septa markings on the specimen. This is an internal mold, so structure is a little different from that of a normal mineralized specimen. Not the largest from this site, as others I've recovered push 25 inches (63.5 cm). The internal siphuncle is exhibited here in cross section: I marked the cross section and direction of the siphuncle here. Phragmocones from this locality only preserve as internal molds without any calcified structure. As a result of poor preservation they can be difficult to spot. With a trained eye, it becomes significantly easier. Here are some additional brachiopods that I dug out from this locality. A fennestellid bryozoan as well. There were a few, but none to write home about unfortunately. My favorite finds at this location are by far the large nautiloids, which have been consistently produced from here. (If only I could find one at 6 feet now ) If anyone has an i.d for that crinoid calyx, I'd be happy to post measurements or more detailed photos. Other than that I hope to run out to Indiana sometime within the month, maybe I'll see some of you out there. -Jonah
  7. SilurianSalamander

    Unknown Paleozoic echinoderm

    Crinoid calyx or echinoid? Found in gravel with Ordovician-Devonian fossils. About 2cm across at the widest point. Druzy coating over the fossil which seems to be an external mould. In orange jasper. Thanks so much!
  8. Tales From the Shale

    NW Alabama

    Formation: Bangor Limestone Age: Mississippian Found this location in a remote area of Alabama recently. I Haven't hunted the Bangor in awhile, so I gave it a shot. A fragmentary calyx. Northern Alabama seems to be teeming with these, as I found 8 others in a nearby locality as well. A complete, but squashed roller of a Kaskia? Fenestrella are found commonly articulated with their fans here. This was the best individual I found. My guess is these are Spyroceras? All of my nautiloids come from the Ordovician, so these are unqiue for me. I'm not certain I know what these are. Could be a bryozoan? Bacterial structure? Steinkern? These are sponges I believe, species unknown. Composita brachiopods: Unknown productids: Next are some new brachiopods I have yet to identify. Oh, and here is a brachiopod with an exposed brachidium. Finally here are some blastoids with weird preservational attributes.
  9. Welsh Wizard

    Carboniferous Hash Plate

    Here’s a small hash plate from the Carboniferous of Lancashire in the U.K. I found it a couple of years ago but I have only just got around to cutting it down to a displayable size. It was part of a much larger block and now it’s about 4 inches by 4 inches. It contains a crinoid calyx, some crinoid ossicles and stem pieces and bits of coral. It is from a place called Salthill Quarry
  10. Mochaccino

    Pennsylvanian/Permian crinoids

    Hello, I have a whole bunch of unidentified crinoids I'd like some help identifying. From my guess on the species and the fact that there were all together (as well as the other specimens that came with it), my guess is that these are Pennsylvanian or Permian-aged crinoids from Texas or Kansas. I'm hoping narrowing down the ID would better pinpoint the provenance for them. Here goes. The calyxes all range from 1-2 cm wide. I did attempt to ID them, using resources including this by the forum's @Missourian: #1-#4 I think are all of the same species or at least genus. I'm inclined to say either Delocrinus or Graffhamicrinus, which are similar-looking genuses. 1. 2. 3. 4. 5. This one is a bit unusual in that it seems to have some arm bits preserved, which look like thick spikes. It's a bit crushed but I think based on the calyx pattern it could still be a Delocrinus or Graffhamicrinus. 6. This one has a basal plate pattern like Delocrinus or Graffhamicrinus, but has unusual spines coming off of the radial plates. The following 3 specimens (#7-9) look similar to the above calyxes, but I noticed they somehow seem more globular and rounded. They may be the same genus/species and just variants, or a different genus/species. For instance, if the above are Delocrinus, perhaps these are Graffhamicrinus? 7. 8. 9. The following four (#10-13) are clearly different from the above. Each has a clear infrabasal circlet and stem attachment, plus the calyx expands towards the top, which gives it a more cone-like appearance. These may be Bathronocrinus according to this: http://inyo2.coffeecup.com/kansasfossils/crinoids2.html 10. 11. 12. This one has some proximal arm bits still attached. 13. This next one has very bulbous/swollen calyx plates, which are especially noticeable from the side view. Perhaps a Galateacrinus according to Missourian's diagram? 14. 15. The plate structure is harder to tell on this one, but it has slightly swollen basal plates that form dimples/notches where they meet the radial plates. This is clear on the side profile. I honestly have no idea what this one could be. 16. This one has no plating texture, and I'm thinking it looks like the basal plate of the floating crinoid known as Paragassiocrinus, which is known from Texas. If so, and it is specific to Texas, perhaps I can attribute all these specimens to the Pennsylvanian of Texas as well. 17. An odd specimen, might be a set of basal plates. 18. This seems to be a stem and basal plates. 19. These seem like spines from the anal tube or "umbrella" of a crinoid such as Plaxocrinus (https://www.google.com/search?q=plaxocrinus&sxsrf=ALiCzsbwpZnGPNxgLHUJ4758h1D4GTNkKQ:1669188769957&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjM5sjd5MP7AhWmKkQIHb3vAIkQ_AUoAXoECAEQAw&biw=1257&bih=764&dpr=2#imgrc=atyg4qzOxLWjRM). 20. I'm unsure if this is from a crinoid, but it might be part of a spine. 21. This one I placed separately because the color of the calyx and matrix are different from all the rest, and so it may be from a different locality. Species-wise it looks similar to the first 9 specimens I posted, so it may be a Delocrinus or Graffhamicrinus.
  11. Tales From the Shale

    Glen Dean Formation 2022

    Found a real nice exposure of the Glen Dean Formation in central Kentucky recently. Oh man did it not dissapoint. So here is some of the best crinoid material I have ever found. A calyx with partial arms, pictured with some stems and ossicles. A single ossicle, with crinoid spins, that are still sharp. Both of which are as common as gravel here. A small peculiarcalyx and crinoid cup. This massive gorgeous Pentremites sp. I found this one on my first trip, so unfortunately no scale but I will upload more of it later. More large blastoids this time around as well. It may not be as diverse, but I have only seen this quality of blastoids in the Thunder Bay of Michigan. An uncrushed Composita sp. A nice spirifid of some variety. I want to say Neospirifir but that is likely incorrect as it does not fit the range. The partial pygidium of a Kaskia chesterensis? Mm mm mm! These delicously preserved Zaphrentis spinulosum. I have some monsters of these, but again they're from a previous trip so I will post them later. I did find some gastropods and tons upon tons of crinoid stems and bryozoans as well, here is one image of them with various other pieces. The Glen Dean of Illinois occurs nearly on the same Latitude as this locality does. However it does not compare with the sheer quality and quantity to be found here in Kentucky.
  12. Gabby Collins

    Possible Crinoid

    Found in the French River. Possible Crinoid?
  13. Eastonian

    Crinoid spines

    I collected these spines in Alpena, Mich., Potter Farm Formation, Middle Devonian. I don't know whether these are tegmen spines or stem spines. Nor do I know the genus or species of crinoids that had spines like these. Sharper minds than mine are on the Forum, so I'm hoping someone might have an idea of which crinoid they belonged to.
  14. Eastonian

    Help identifying this calyx

    Earlier this summer, I found this calyx at Partridge Point (Middle Devonian), Alpena, Michigan. I have tried to identify it, but I am stuck. Your thoughts?
  15. Hammerstine

    Crinoid calyx

    I’m posting some pics of what I believe to be a cluster of Crinoid calyx. I’ve found a few such as these . All in a cluster and all seem to be covered in calcite. Looking forward to hearing what you think. It was found in a creek in Jefferson county Missouri. It is 5”x5”. The creek is amazing. I can’t describe it so I’ll post a few more pics. It’s been awhile since I’ve been such a rookie so bare with me. Thanks
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