3.5 cm Arnioceras, Monmouth beach, Lyme Regis, Jurassic coast, UK
This 3.5 cm Arnioceras was found on Monmouth beach, Lyme Regis - prepared in the pebble it was found in.
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone formation. 199 MYA
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