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Arthur1
9BD4F6F5-1F52-482C-AA2C-C801977AD185.jpeg  D2F75E19-10DC-4DD8-8458-A9D8BEF5B0B8.jpeg  78FFA77E-1878-4A6C-B448-CE17D72E5E23.jpeg  688DE716-22D4-40E2-9705-DEA8B9E6FD73.jpeg  I’ve been prepping this fossil which someone suggested was part of a Gyrosteus . 
Im not too sure what part of the fish I’m looking at - boney fins ?

Any suggestions will be gratefully received !
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prep01
Hello Arthur, if this was found on the North Yorkshire coast then it probably is Gyrosteus but I'm no expert.
Colin Huller
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Arthur1
Thanks

yes it was found near Whitby
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Dirty Pete
Hi Arthur

I think they are probably ribs. k in diagram of a sturgeon (related) below

NIE_1905_Sturgeon_-_Skull.jpg 

Pete
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Arthur1
Thanks Pete
I think you could well be correct - although there does seem to be some type of “membrane “ lying under some of the ribs. It’s difficult to see in my photos - but it is just about visible under what looks like a small shell in my last photo closeup
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Dirty Pete
I'm no fishmonger but I'd imagine fins need to be flexible and capable of fine movement. 6" x 1/2" bones seem a bit inflexible. Sadly there doesn't seem to be much literature re Gyrosteus fins on the net...

Pete
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