8 cm Arnioceras semicostatum, Lower Jurassic, Black Ven, Lyme Regis
This 8 cm Arnioceras semicostatum was found on Black Ven, Lyme Regis. Fossilised after the shell was broken (Either by predation or by decomposition of the soft bodied ammonite within) All the rock has been removed so you are able to see the back of the body chamber and the first few chamber walls. It also has a near complete mouth border which is uncommon to see on these ammonites.
The piece has had no restoration and is well preserved. There is a small glue line from where the ammonite was discovered.
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone formation. 199 MYA
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