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nomadiclifeguide
Found this in one of my "will deal with it later" bags, I think it's from port mulgrave, at least it's from Yorkshire.
DSCN7202.jpg  DSCN7203.jpg  DSCN7204.jpg  DSCN7205.jpg 
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prep01
Ammonite keel is all I can think it might be.
Colin Huller
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nomadiclifeguide
We are fairly familiar with YC material and I'm pretty certain this is bone. It's not ammonite keel, look at picture 3, it is throughout the specimen.
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Brittle Star
Colin

I thought ammonites keel before I saw your post, very worn. I do not see evidence of any bone like honeycomb structure or any defined edges of one.
JW

 Never ask a star fish for directions
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Elbert
Hello, this looks like remains of the fins of a sturgeon known as Gyrosteus sp. a common find from this location.
That these remains do not look like bone on first glance is because Gyrosteus had a cartilage skeleton of wich only the hardened parts would fossilize, similar to sharks vertebra.
Still a nice find!

greetings, Bert
the search is as valuable as the finds...
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nomadiclifeguide
Thanks everyone, its been hanging around for ages and we had no idea really. Will probably take it to show to Byron or Mike in Yorkshire, easier to get an ID when its 'in the hand'.
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TqB
I agree with Bert that it's Gyrosteus fin.
Tarquin
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AndyS
Yes, definitely Gyrosteus. I have a very similar specimen.
Visit my liassic ammonites (+ other fossils) blog at andysfossils.com
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nomadiclifeguide
Thanks for your replys. Is this worth prepping and if so how?
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