5.5 cm Arnioceras, Black Ven, Lyme Regis, Jurassic coast, UK
This 5.5 cm Arnioceras was found on Black Ven beach, Lyme Regis. Free standing, surrounded by other smaller arnioceras sp. ammonites.
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone formation. 199 MYA
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