Early Cretaceous
The Early Cretaceous - also called the Lower Cretaceous by geologists, is the earlier of the two major divisions of the Cretaceous period.
During this time many new types of dinosaurs appeared or came into prominence, including the Psittacosaurs, Spinosaurs and Coelurosaurs, while other holdovers from the Late Jurassic continued.
In the seas, the ichthyosaurs declined and eventually died out at the start of the Late Cretaceous. Neognathous birds, and angiosperms, appear for the first time.