A uncommon 5 cm Microderoceras ammonite that originates from the popcorn stone it was found on Charmouth beach, Jurassic coast, UK. It's around 195 million years old.
In a unbroken nodule with some beautiful colouring, the microderoceras rests on a bed of calcite. 
 
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone Formation, Charmouth, Dorset. 195 MYA
 
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