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Climacograptus sheldoni

Climacograptus sheldoni

Climacograptus was a graptolite, an extinct colonial animal related to the primitive chordates.

It lived in the Middle and Late Ordovician Period (about 472 million to 444 million years ago). Climacograptus is characterized by a single, serrated branch suspended from a thin stem below an irregular float; its outline is distinctively angular. Several species are recognized, and the genus is useful for correlating smaller time divisions within the Ordovician.

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