A Geology Song Oh, Graptolites by Brenna Lorenz (Melody: Danny Boy) |
Graptolite Net edited by Piotr Mierzejewski, the Count of Calmont and Countess Maja A. Korwin-Kossakowska Established 2002 |
Eggs of Ordovician cephalopods on stipes of the sessile graptolite Mastigograptus |