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Bontebok1
Had a lovely first visit to Mappleton last weekend where we found a wealth of belemnites, gryphs, bivalves, 20200906_192533.jpg  20200906_192433.jpg  20200906_192351.jpg  20200906_192331.jpg  20200906_192301.jpg  20200906_192247.jpg  20200906_192240.jpg  ammonite fragments and a single echinoid. However, also found this and wasn't sure what it was. Anyone got any ideas?
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Barrow Museum
Yes, it is also an ammonoid fragment.  Although it is only a tiny fragment I can see from the cross-section that the whorl was not overlapping the previous one, and I am guessing it might have come from the Lower Cretaceous Speeton Clay, where these apparent uncoiling heteromorph "ammonites" are not uncommon.  Look for genera like Paracrioceras to see what it probably looked like when complete.  The Speeton Clay crops out along the cliffs south of Reighton, so it need not have travelled too far down the coast, either recently or ice-transported during the Pleistocene.
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Bontebok1
Thanks, really interesting. Have to admit another piece of ammonite was not on my radar. It is so unlike anything other piece of ammonite I have found.
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Narlgoth
It looks quite badly sea-worn on its outer edge, but what gives it away as an internal Ammonite section is the wavey pattern known as sutures. They mark the boundry between each chamber inside the Ammonite's shell. What you have is a single chamber from the inside on an Ammonite.
- Brad
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Bontebok1
Narlgoth wrote:
It looks quite badly sea-worn on its outer edge, but what gives it away as an internal Ammonite section is the wavey pattern known as sutures. They mark the boundry between each chamber inside the Ammonite's shell. What you have is a single chamber from the inside on an Ammonite.


That's great info. Sonething i wouldn't have arrived at by myself.Thanks. 
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