Which geological time period began about 23 million years ago?

Name: Which geological time period began about 23 million years ago?
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The Miocene epoch began around 23 million years ago and ended around 5.3 million years ago. It was a time of significant climate change, with a gradual cooling trend and the development of grasslands and savannas. Many familiar animal groups, such as elephants, horses, and apes, evolved during the Miocene.

Which Geological Time Period Began About 23 Million Years Ago