Here is a beatufull plate of this typical index fossils from the Ordovician sediments of Great Brittan. Graptolites are very imported for the zoneation of the British Ordovician rocks. | |||
Location: | Minsterley ,Shropshire,UK | ||
Size of plate: | about 110 x 55 mm | ||
Age: | Ordovician, Llanvirn, Hope shales, Didymograptus artus-Biozone (about 470 mill. y.o.) |