30 Mya to 25 Mya

30 Mya to 25 Mya

28.1 Mya, Paleogene, Oligocene Chatian: Ancestor of apes and humans. Grande Coupure extinctinction.  Start of widespread Antarctic glaciation. Rapid evolution and diversification of fauna, especially mammals.

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27,000,000 BP, USA: A volcanic eruption at what is now La Garita Caldera site of the San Juan volcanic field in Colorado. Approximate ejecta bulk volume: 5,000 km cubed.

~ USA: The Laramide Revolution shook the Earth. It raised the US state of New Mexico above sea level and began a period of Volcanism.

25,000,000 BP, USA: In the Laramide Revolution the land of what is now New Mexico was raised above sea-level and began a period of volcanism

15 Mya to 10 Mya(?)

 15 Mya to 10 Mya

13.82 Mya: Neogene, Miocene, Serravaillan: Warmer climate during Middle Miocene.

12 Mya: About this time there was a massive, explosive volcanic eruption on the border of what is now Argentina and Bolivia. Cerro Panizos of the Altiplano Puna volcanic complex.

11.830 Mya: About this time a massive, explosive volcanic eruption occurred at what is now the Bruneau/Jarbridge, Yellowstone hotspot in Idaho, USA. It was responsible for the Ashfall Fossil Beds 1,600 km to the east.

11.63 Mya: Neogene, Miocene, Tortonian: Gradual separation of human and chimpanzee ancestors. Sahelanthropus tchadensis in Africa. 

11.7 Mya, Greenlandia Age of the Holocene Epoch: Current interglacial begins. Sea level flooding of  Doggerland and Sundaland. Sahara desert forms. Neolithic agriculture was practiced.(?)