Spiral Graptolite, Oktavites spiralis (Geinitz), Cyrtograptus, graptolite from Silurian, Wenlockian 433.4 - 427.4 million years ago.

Silurian, Wenlockian Graptolite, Oktavites spiralis (Geinitz)

Spiral Graptolite

Spirograptus

gr46

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