Parakidograptus acuminatus

fossil graptolite

Learn about this topic in these articles:

In Silurian Period: Ordovician-Silurian boundary
…use the base of the Parakidograptus acuminatus biozone (a group of concurrent graptolite species) as the base of the Silurian System. The stratotype was fixed at a horizon in Dob’s Linn near Moff in the Southern Uplands of Scotland. The effect on sea level of Late Ordovician glaciation, combined with…
Read More