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I wonder if you might find evidence in near-earth orbits.

Would a geosynchronous satellite stay in place after 400 m.y.a? Or a descent stage of a moon lander, perforated by impacts, from a Troodon?

The worst part of this, the realization that the K-T boundary was the fallout of a nuclear exchange.

We are pretty sure KT was caused by a giant asteroid. Maybe the space Silurians redirected it into Earth? (Not serious)