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Warren E
I bought this ammonite on ebay from a collector in Kings Lynn.

Could anyone help me identify it? It was described as collected on a sea dive.

Thanks Click image for larger version - Name: 20190322_193348.jpg, Views: 51, Size: 252.99 KB Click image for larger version - Name: 20190322_193405.jpg, Views: 55, Size: 277.27 KB
Warren E
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Gandalf the White
dactylioceras
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Gandalf the White
I use google :)
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Bobo the bear
Looks like a Dactylioceras commune from Yorkshire coast
Bobothebear
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AndyS
Certainly not a Dactylioceras, and very likely not Yorkshire coast.
It does look like a Peronoceras fibulatum, but this type of preservation with a white shell is unknown from the Yorkshire coast.

Visit my liassic ammonites (+ other fossils) blog at andysfossils.com
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Warren E
I have never seen this white preservation for a yorkshire coast ammonite and so assumed it was younger.....I am very interested to know what it is and where it was collected from...if anyone knows. I can post more pictures if that helps...

Thanks 
Warren E
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Warren E
I have tried to clean it up some more and you can clearly see spines on the reverse side. Click image for larger version - Name: 20190323_121248.jpg, Views: 41, Size: 264.04 KB Click image for larger version - Name: 20190323_121436.jpg, Views: 41, Size: 126.74 KB
Warren E
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prep01
This type of shell preservation is common in the Callovian / Oxfors clay Ampthill clay.
Colin Huller
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Elbert
Hello, the inner ribs are clearly looped; therefore I think it is a Peronoceras sp.

greetings, Bert
the search is as valuable as the finds...
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Warren E
That's the one. I agree it is a peronoceras but where would it have come from? Presumably not from the UK? Anyone got any ideas?

Warren E
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prep01
Wrren - it might have well have been found by a diver along the Yorshire Coast - range upper lower to middle jurassic I believe.
Colin Huller
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South of the Humber, the Toarcian ammonites can have a white shell preserved, quite unlike the more familiar Yorkshire coast preservation.  My thoughts are that this Peronoceras is from a facies of the Whitby Mudstone Formation similar to that found in North Lincolnshire, but originating offshore in the North Sea, maybe dredged up by Quaternary ice and then found by the diver on the seafloor.
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Warren E
Many thanks that sounds correct to me.

W

Warren E
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