Among the temperature-history is the Hirnantian cold snap. This is now-constrained 445.21 to 443.07 Mya at the end of the Ordivician, occasioning a famous mass-extinction and now, perhaps, defining that terminus. Among theories on Why, came an orbital ring.
The asteroid would have been captured 466 Mya; it broke up and rained down some big craters then. These didn't hurt anything because, hey, Ordovician: land life was just lichen and worms. But enough rock stayed up there - they claim - it could have formed a ring.
I am unsure how they work the physics. We are now 104.2% the temperature we were in the Ordovician. Our moon has also drifted from Earth since then (were the tides measurable?). A closer moon should disrupt pseudosatellites - you'd think it would just yeet them out.
BACKDATE 9.21
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