The Late Devonian mass extinction (roughly 372 million years ago) was one of five mass extinctions in Earth’s history, with roughly 75% of all species disappearing over its course. It happened in two “pulses,” spaced about 800,000 years apart, with most of the extinctions happening in the second pulse. However, for one group of animals living in eastern North America, the first pulse dealt the deadlier blow.
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Source: Phys.org