An event known as the Mid-Tertiary ignimbrite flare-up caused several volcanic eruptions across the western United States during the middle of the Cenozoic Period some 40-25 million years ago. What’s striking, however, is the apparent lack of catastrophic consequences on nature brought about by the cataclysmic event.
The Western United States Blew Up Millions of Years Ago Because of Magma. Why Were There No Extinctions?
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