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Andrew Martin David Marsh

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Hi all

Founds this lovely big ammonite in the Bedfordshire chalk today. Think the location is Cenomanian in age if that helps. Would love to know what it is.

Andrew

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Brittle Star

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Reply with quote  #2 
Hi and welcome,

I have no idea about the Ammonite but I would save the tooth that is on it, looks like it could come off anytime. Very nice.

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Andrew Martin David Marsh

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Hi thanks for the reply. The shark tooth is actually separate from the ammonite. I just put it there to emphasise the size of the ammonite. Sorry for any confusion.
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estwing

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Hi Andrew
I would say it looks like Parapuzosia, but I'm not sure whether it actually existed in the Cenomanian.
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prep01

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Reply with quote  #5 
Hello Andrew, I think it's Schloembachia, but really need it cleaned up and more photos.
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TOARCIANJOHN

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Reply with quote  #6 
Hi Andrew,  It is essential to remove matrix so as to reveal the inner whorls and also a photo of the venter. It does not appear to have strong ribbing and by the hammer , is it about 250mm diameter. There are not mant giants in the Cenomanian and yours could be a Puzosia or a Forbesiceras. If it is from the Lower Chalk, Acompsoceras possibly. Anyway, lets see it tidied  up first, if possible.
Greetings,  TOARCIANJOHN

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andy333

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Reply with quote  #7 
Forbesiceras have a tiny deep umbilicus, so not that. Acompsoceras have large umbilical bullae on the inner whorls, so not that. Schloenbachia? one of the smoother versions possibly a fully mature one. Their maximum recorded size is 240mm I think. Parapuzosia (Austiniceras) austeni are rare in the lowest chalk (Mantelliceras Mantelli zone) I would put my money on that if I had to. A keel shot would help. I would not prep it yet. Let it dry slowly, let it set, see if it cracks.      
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Rolo

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Reply with quote  #8 
Schloenbachia is smaller than this and although very variable most forms have distinct ribs and tubercles.
This is most likely Parapuzosia austeni which is fairly common in the middle Cenomanian but rare in the lower. P.austeni is usually encountered in the Acanthoceras zones.
Inner whorls are rarely well preserved on these, but with care it should clean up to reveal more detail.
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