Eocene is the fossil forms that meet all of the criteria for a true primate are first found in the Eocene epoch.
What is Eocene?
Between the Paleocene Epoch's conclusion and the start of the Oligocene Epoch is the Eocene. A brief time at the beginning of the Eocene is characterised by an abnormally low atmospheric concentration of the carbon isotope 13C in comparison to the more prevalent isotope 12C. The Grande Couture (the "Great Break" in continuity) or Eocene-Oligocene extinction event, which may have been caused by the impact of one or more enormous bolides in Siberia and what is now Chesapeake Bay, marks the end of the story. The strata that mark the beginning and end of the epoch are well known, just like with previous geologic periods, albeit their precise dates are a little hazy.
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