Study finds mass extinctions of Earth's land animals follow a cycle -- Science & Technology -- Sott.net

© NASA/Donald E. Davis
An artist's impression of a giant space rock slamming into Earth 65 million years ago near what is now Mexico's Yucatan Peninsula. A consortium of scientists now says this was indeed what caused the end of the Age of Dinosaurs.
Asteroids aren't completely random?
Mass extinctions of life on Earth appear to follow a regular pattern, a new study suggests.
In fact, widespread die-offs of land-dwelling animals - which include amphibians, reptiles, mammals and birds - follow a cycle of about 27 million years, the study reports. The study also said these mass extinctions coincide with major asteroid impacts and devastating volcanic outpourings of lava.

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