Artist's impression of a Tertiary period landscape. This period extended from 65 to about 2 million years ago and is divided into five epochs: the Paleocene, Eocene, Oligocene, Miocene and Pliocene. Dinosaurs died out early on in the Tertiary and mammals progressed rapidly. Anthropoid apes appeared, and towards the end the present forms of the continents developed. There was considerable volcanic activity, and it is thought that the Himalayas (amongst other mountain ranges) originate from the Miocene epoch. Temperatures dropped signaling the beginning of the ice-ages at the end of the Pliocene. Some animals pictured include, oreodont (Promerycochoerus), camel (Stenomylus), and group of elephants, and a bird.