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Showing results for tags 'orthocone?'.
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Hello, Here are a bunch of old collection fossils that have me stumped...almost no info on provenance so tricky, but I'm hoping I can get at least a fossil identity for them if possible. There are 13 in total, here goes: 1. Crustacean/brachiopod steinkern? 2. Crustacean? Brachiopod? 3. Is this a coral? 4. No clue...thought orthocone but seems too thin? 5. No clue 6. Thought some sort of echinoderm but almost looks six-sided? Reminds me of a construction nut used for screws. 7. Some sort of brachiopod? 8. This seems like a trilobite pygidium, appears to be on a white block of matrix? Any guesses as to specific ID? 9. These seem echinoderm. The one with the protrusion in the center might be an echinoid plate, the rest crinoid plates? 10. I'm guessing these are echinoid spines 11. Looks like some heteromorphic ammonite sections. The one on the right with a double row of tubercles might be Nostoceras or Didymoceras? 12. I'm pretty sure these are Conulariids but does the preservation inform the provenance or ID further? EDIT: one more: 13. Orthocone? Thanks!
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Eurypterid or sponge bored orthocone? Revisiting a Mississippian puzzle
TqB posted a topic in Fossil ID
A while ago, I was convinced that this was an orthocone with possible sponge borings though it was never really resolved. http://www.thefossilforum.com/index.php?/topic/77979-strange-infestation-on-orthocone-shell-mississipian-ne-england/& @Al Dente suggested eurypterid as a possibility which I argued against, largely because they've never been found around here. However, a friend of mine has now found some undoubted eurypterid fragments in equivalent beds in Scotland, 120 miles away or so and where the faunas have much in common. He's pretty sure that this is indeed eurypterid (based on just a couple of closeup photos). I'm rather hoping it is though the boring sponge is also pretty interesting. Searching throws up Adelophthalmus as a distinct possibility, based on the ornament (see reference and drawing at the bottom of the post). So here it is again - eurypterid or bored orthocone? Brigantian (Mississippian) marine shale, Co. Durham, NE England. (Many more photos on the original thread, including very close up. The little rings are preserved in solid pyrite and go right through the shell/carapace.) From this paper on Pennsylvanian Adelophthalmus https://www.foss-rec.net/8/3/2005/fr-8-3-2005.pdf- 11 replies
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1. if have hole = orthocone cephalopods/ Orthoceras Cephalopoda? 2. bigger have not hole this also accustomed thing but what? 3. more dark with camber maybe pottery lug? every day lot of circle with half-moon hole, so very common, please teach me what is it, thanks!