5.5 cm Arnioceras semicostatum, Lower Jurassic, Monmouth beach, Lyme Regis
This uncommon 5.5 cm Arnioceras semicostatum was found on Monmouth beach, Lyme Regis. Prepared resting in it's nodule, a lovely display piece. The ammonite was found by breaking the nodule which can be seen in the right hand side of the first photograph. There is no restoration on this piece.
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone formation.
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