Stephan Hack

Glochiceras auritulum

Goniomya literata

Grammoceras doertense

Grammoceras doertense

Grammoceras fallaciosum

Grammoceras quadratum

Grammoceras quadratum

Grammoceras saemanni

Grammoceras striatulum

Grammoceras thouarense

Grammoceras thouarense

Grammoceras-Dumortieria Übergangsform

Graphoceras (Graphoceras) cf. formosum

Graphoceras (Graphoceras) concavum

Graphoceras (Graphoceras) concavum

Graphoceras (Graphoceras) concavum