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

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Silurian, Wenlockian Graptolite, Oktavites spiralis (Geinitz)

Oktavites spiralis

Spirograptus

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