Características
Piece of ± 7 x 6 cm , with a seabed containing gastropods (Platyostoma niagarensis), bivalves (Rynchonella) and a coiled trilobite (Asaphus expansus) on top of a Crinoid Calyx.
Periodo
Silurian,
Waldron Shale Formation
Procedencia
Waldron,Indiana
USA
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