Other contributors have said "What is the volume of paleocene?" is the same question as "When was the Paleocene?" If you believe that these are not asking the same thing and should be answered differently, click here
The Paleocene(65.5 - 55.8Ma) is an epoch in the Paleogene Period(65.5 - 23.3Ma).It is also the 1st Epoch of the Cenozoic Era(65.5Ma - Now).It is also in the Phanerozoic Eon(542Ma - Now).