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The Paleocene (/ËpÃ¦liÉµsiËn//ËpeÉªliÉµsiËn/[2] or Palaeocene, the old recent, is a geologic epoch that lasted from about 66 to 56 million years ago. It is the first epoch of the Paleogene Period in the modern Cenozoic Era.
As the glaciation expands, most of the additional growth takes place in the Northern Hemisphere. The whole of the last 2 million years, the Quaternary period, is considered an ice age, a relatively rare state of affairs in geologic history. But this long-term ice age has been marked by ebbs and flows in glacial extent. The work of the past two centuries in climatology, paleobiology, meteorology, astronomy, geology, geophysics, and many other fields has confirmed the existence of an astronomically determined cyclical pattern within the Quaternary ice age.