A uncommon stable 9.5 cm 3d Microderoceras ammonite that originates from the popcorn stone and was found on Charmouth beach, Jurassic coast, UK. It's around 195 million years old.
A preparation attempt was started on the reverse, please see photos, the nodule has not been broken. 
 
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone Formation, Charmouth, Dorset. 195 MYA
 
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