hace alrededor de 76 a 74 millones de años

Estas características

a long-necked plesiosaur that shared the same oceanic habitat

and material labeled in collections sometimes appears as Crotalocephalina (Crotalocephalus) gibbus

en una formación geológica rica en fósiles

Ichthyosaurus communis simocetus hace alrededor de 76 aIchthyosaurus communis was a marine ichthyosaur reptile from the Early Jurassic of Europe, particularly well known from fossils recovered along the Jurassic Coast of southern England, at classic localities such as Lyme Regis and Charmouth in Dorset. Formally described by De la Beche and Conybeare in 1821, this taxon is the type species of the genus Ichthyosaurus and one of the most iconic forms in the early history of British palaeontology. Its