Quaternary
Renewable Energy
The present period, forming the latter part of the Cenozoic Era, originating about 1 million years ago and including the Recent and Pleistocene epochs.
- — ODOE Glossary of Energy Terms retrieved 2014-06-15
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Solar Energy
The most recent period of the Cenozoic era, spanning the time between 2.6 million years ago and the present. It contains two epochs: the Pleistocene and the Holocene.
- — Solar Energy Development PEIS Glossary retrieved 2014-06-15
Water
Refers to the geologic period of the last 2,000,000 years and includes the Pleistocene and Holocene (last 10,000 years) epochs.