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“Tuning fork” graptolites

graptolites final

This is a slab of slate with many specimens of the “tuning fork” graptolites, Didymograptus murchisoni.

Graptolites are very imported index fossils in the zoneation of the British Ordovician.
These are from the Llanvin Series, Abereiddy Bay, Dyfed, South Wales.

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