Paleontologists say mass extinctions on Earth follow a 27 million year cycle
Shane McGlaun - Dec 13, 2020, 9:13am CST
Recently paleontologists have discovered something that many will find rather chilling. According to new research, mass extinctions of land-dwelling animals, including amphibians, reptiles, mammals, and birds, follow a cycle spanning about 27 million years. Interestingly, this mass extinction cycle also coincides with previously reported mass extinctions of ocean life. The study has found that mass extinctions align with significant asteroid impacts and volcanic eruptions on Earth.
There are five major mass extinction events in the fossil record. Those mass extinctions include one at the end of the Ordovician period 443 million years ago, one at the end of the Denovian period 360 million years ago, one at the end of the Permian period 250 million years ago, one at the end of the Triassic period 201 million years ago, and one at the end of the Cretaceous period 65 million years ago.
https://www.slashgear.com/paleontologists-say-mass-extinctions-on-earth-follow-a-27-million-year-cycle-13650921/
