07777 Top 3.52 Inch Mosasaur (Prognathodon anceps) Partial Jaw (Preserved Replacement Emerging Germ Tooth) Trilobites Very few studies have been Very few studies have been made on this species and therefore nowadays we still know very little about the giant sawfish to whom this rostral tooth must have belonged Reedops sp: Fossilworks (Paleobiology Database) The basin has a so great continuity in its stratigraphic record that both the Upper Cretaceous as well as the two first epochs of the Paleogene (Paleocene and Eocene) can be studied it has a series of very important paleontological sites in which amazing assemblages from big and small marine vertebrates are present