1) Epoch 2) French word used in English 3) Of a tertiary epoch 4) Paleocene epoch 5) Prehistoric epoch 
The Paleocene (n or n; symbol Pε ) or Palaeocene, the `old recent`, is a geologic epoch that lasted from about {ma|Paleocene|Eocene|million years ago}. It is the first epoch of the Paleogene Period in the modern Cenozoic Era. As with many geologic periods, the strata that define the epoch`s beginning and end are well identified, but the......
geological period between 65 and 55 million years ago;
[n] - from 58 million to 63 million years ago
Paleocene epoch noun from 63 million to 58 million years ago; appearance of birds and earliest mammals
Earliest epoch of the Tertiary period, spanning the time between 65 and 55.5 million years ago. It is named after the Greek words 'palaois' (old) and 'ceno' (new).