CENOZOIC ERA:

TERTIARY PERIOD
interval of geologic time lasting from 66.4 to 1.6 million years ago. It constitutes the first of two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions, which from oldest to youngest are the Paleocene, Eocene, Oligocene, Miocene, and Pliocene epochs. Some authorities prefer not to use the term Tertiary and instead divide the time interval encompassed by it into two periods, the Paleogene Period (66.4 to 23.7 million years ago) and the Neogene Period (23.7 to 1.6 million years ago). 

QUATERNARY PERIOD
interval of geologic time, the youngest of the 11 periods in Earth history. The Quaternary follows the Tertiary Period and is part of the Cenozoic Era. Its boundaries have been defined as 1,600,000 years ago to the present day. It is subdivided into the Pleistocene Epoch (q.v.; 1,600,000 to 10,000 years ago) and the Holocene Epoch (q.v.; 10,000 years ago to the present.

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