On Thursday, October 26, 2023 at 4:14:40 PM UTC-5, Archimedes Plutonium wrote:
Ediacaran 635 to 538 million years ago (mya) duration 96 million years Cambrian 538 to 485 mya duration 53 million years
Ordovician 485 to 443 mya duration 42 million years
Silurian 443 to 419 mya duration 25 million years
Devonian 419 to 358 mya duration 60 million years
Carboniferous 358 to 298 mya duration 60 million years
Permian 298 to 251 mya duration 47 million years
Triassic 251 to 201 mya duration 51 million years
Jurassic 201 to 145 mya duration 56 million years
Cretaceous 145 to 66 mya duration 79 million years
Paleogene 66 to 23 mya duration 43 million years
Neogene 23 to 2.6 mya
Quaternary 2.6 to 0 mya
(courtesy Wikipedia)
So on average from Cambrian through Paleogene of 538 - 23 = 515 million years divided by 10 is 52 million years per period. And such regularity of time spans for biological mass extinctions begs the question of a mass extinctor of such regularity. Such
regular patterns cannot come from willy-nilly volcano eruptions or CO2 atmospheres or even bolides of the Cretaceous mass extinction. Such regularity must come from some regularity in geology itself-- such as 1/2 Earth in permanent darkness and the other
face of Earth in permanent sunshine all day and all year round. Meaning the Moon was not yet arrived until end of Cretaceous to cause a axis tilt and the 4 seasons and where the rotation is not the same as the revolution. But there needs to be another
factor-- Continental Drift where continents move into and move out of the all darkness or all sunshine side of Earth.
Here we need to explore also whether Continental Drift moves the Earth axis of rotation as the supercontinent forms or when the supercontinent breaks apart.
Regularity of mass extinctions defining periodic geological periods needs a regularity in geological processes in action-- Continental Drift coupled with 1/2 of Earth in permanent darkness, 1/2 in permanent sunshine.
AP
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