8 cm Arnioceras semicostatum, Lower Jurassic, Monmouth beach, Lyme Regis
This uncommon 8 cm Arnioceras semicostatum was found on Monmouth beach, Lyme Regis. Prepared resting in it's nodule which is naturally worn, a lovely display piece. The ammonite has one broken rib but other than that it's pretty perfect. No restoration.
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone formation.
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