Eons are divided into eras, which are in turn divided into periods, epochs and ages. Most of these were active during the Pleistocene and Holocene epochs. This climate event occurred at the time boundary of the Paleocene and Eocene geological epochs. The end of the Younger Dryas marks the boundary between the Pleistocene and Holocene Epochs. It is divided into two epochs&colon; the Pleistocene and the Holocene. Anteaters and sloths diverged around 55 Mya, between the Paleocene and Eocene epochs. This period consists of the Paleocene, Eocene and Oligocene Epochs. Fossils and artifacts are "documents" of the epochs hypothesized. Each of these epochs represents an age within history. This period consists of the Paleocene, Eocene, and Oligocene epochs. The Neogene is sub-divided into two epochs, the earlier Miocene and the later Pliocene. It has three major epochs&colon; Early Triassic, Middle Triassic and Late Triassic. The meaning of right-wing "varies across societies, historical epochs, and political systems and ideologies". What types of lexicons and terminology were known and employed during certain epochs? Note that both are reset each millisecond (synchronized with C/A code epochs).