| Here is a nice plate of this typical index fossils from the Ordovician sediments of the famous Abereiddy Bay, south Wales. Graptolites are very imported for the stratigrafic zoneation of the British Ordovician Slates. | |||
Location: | Abereiddy Bay, Pembrokeshire, South Wales,UK | ||
| Size of plate: | about 130 x 85 mm | ||
| Age: | Ordovician, Llanvirn, Hope shales, Didymograptus murchisoni -Biozone (about 470 mill. y.o.) | ||