tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on Nov 20, 2014 6:20:15 GMT -5
I've just been give this in a swap from Gary (dinogary). It's from Trearne, Brigantian, and is about an inch long. It's basically a tube (perhaps a bit cyrtoconic), with bits of shattered shell at one end that looks like a septum but no sign of a siphuncle that I can see. We've been assuming it's nautiloid but the decoration is unusual. Could it be something else, an uncoiled bit of heteromorphic gastropod? - or other weird cephalopod?    |
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tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on Nov 20, 2014 6:24:17 GMT -5
Ornament detail:  Ends (the dark area in the middle of pic one is just shadow, not siphuncle. This is the shattered shelly end.)   |
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Post by Joe Botting on Nov 20, 2014 11:41:21 GMT -5
Curious... I agree this is very unusual ornament, and I never saw anything like in the extensive collections at Leeds. There are of course some giant gastropods like Phanerotinus, but again I've not seen any with this sculpture. Have called in some backup on this one..!  |
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tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on Nov 20, 2014 14:25:40 GMT -5
Thanks, Joe! - I've put it on TFF as well but no results so far...
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tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on Nov 21, 2014 5:54:12 GMT -5
I knew I had something else like it - just dug this out from a drawer. It's from Weardale, County Durham - about 125 miles from Trearne, still Brigantian though (shale above 3 Yard Limestone). It's just a fragment and not so well preserved, smaller diameter than the other bit, 14mm long.   |
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tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on Nov 21, 2014 7:45:39 GMT -5
I've been browsing through the Treatise and the pseudorthoceratid Spyroceras is very similar - some nice images on the web. It's Devonian but subfamily Spyroceratinae ranges into the Permian.
I know we need the internal details but at least this sort of ornament is known from nautiloids.
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tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on May 9, 2015 4:28:03 GMT -5
Mystery solved, I think - an online friend of mine in Russia has just pointed this out. A lovely specimen of the orthocerid Cornuella ornata (Eichwald, 1840). (At the top of the page) www.ammonit.ru/foto/45744.htm#232273 |
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Post by Joe Botting on May 13, 2015 10:58:30 GMT -5
Mystery solved, I think - an online friend of mine in Russia has just pointed this out. A lovely specimen of the orthocerid Cornuella ornata (Eichwald, 1840). (At the top of the page) www.ammonit.ru/foto/45744.htm#232273That's excellent news - thanks for letting us know! I note that there don't seem to be any records of this species from outside Russia on the web... |
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tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on May 13, 2015 11:21:49 GMT -5
"I note that there don't seem to be any records of this species from outside Russia on the web..."
Seems not - there are a few references to it in Dzik, 1984, Phylogeny of the Nautiloidea, but no location details. A few leads to follow but I don't know if I can track down the papers.
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Post by Joe Botting on May 14, 2015 14:51:14 GMT -5
"I note that there don't seem to be any records of this species from outside Russia on the web..." Seems not - there are a few references to it in Dzik, 1984, Phylogeny of the Nautiloidea, but no location details. A few leads to follow but I don't know if I can track down the papers. Let me know if there's something specific you need - I might be able to help via secret avenues... |
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tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on May 15, 2015 14:45:46 GMT -5
Thanks, Joe!
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