This unbroken nodule measures 21 cm across it's widest part, one larger microderoceras, the rest of the stone is full of promicroceras and cymbites ammonites. 
The piece originates from the popcorn stone and was found on Charmouth beach, Jurassic coast, UK.
 
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone Formation, Charmouth, Dorset. 195 MYA
 
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