tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on Feb 16, 2011 11:41:36 GMT -5
From Abereiddy, murchisoni Shales - I'd always wondered what these are doing in graptolitic shales and if there's any up to date nomenclature. Thanks, Attachments:
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Post by pleecan (Peter Lee) on Feb 16, 2011 13:00:24 GMT -5
The geometrics on the shell is amazing... I will post something later playceras from the Devonian that looks similar....
Peter
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Post by Joe Botting on Feb 17, 2011 7:57:44 GMT -5
That's a new one on me! I don't know Abereiddi well enough to have got to grips with the complete fauna, but I do know there's a lot more there than is normally mentioned (like a lot of graptolitic mudstones). There are certainly a fair few trilobites, and even an occasional echinoderm (carpoid or crinoid, but too poorly preserved to be sure). Not sure exactly what this would have been doing there, but if it wasn't a predator then it may have either been a detritivore, or perhaps sank after hitching a lift on floating seaweed.
Ordovician gastropods of the UK are a bit of a forgotten area... we've been collecting them over the years, but practically all the ones in Builth are probably new. There's a guy in Sweden who might be interested, though - Jan Ove Ebbestad at Uppsala. If the genus has been revised, it's probably been done in Scandinavia!
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Post by Joe Botting on Feb 17, 2011 8:52:41 GMT -5
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tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on Feb 17, 2011 10:14:50 GMT -5
Thanks very much for all that, Joe, Ceratopea does seem close.
I see it's " mostly from eastern North America as well as Greenland and Scotland" but, from what you say, Welsh gastropods haven't been looked at much. Too many fossils, too few specialists!
I only found the one piece but the shells all seem to pack the same bedding plane with Diplo- or Climacograptus on the back.
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