Spiroceras obliquicostatum Quenstedt with Lissoceras sp.
A very rare and unusual combination. Beautifully preserved outer whorl of the weird heteromorph Ammonite, Spiroceras. Lying next to a conventional Ammonite shell in Lissoceras.
Jurassic, Bajocian, Humphriesianum Zone.
Burton Bradstock, Dorset.
Spiroceras : 2.3 wide. Lissoceras : 1.8 cm diam.
