Polystrate fossils are a key indicator of this being true. Maybe not those overlapping one-or-two layers, but the fossilized trees that cut through many layers, as that logically sets the date of those layers to be the same (geologically speaking; before the tree can rot). Although I don't know this to be true, I would not be surprised to find an unbroken chain of fossilized trues from the top of the geologic column right to the bottom, which would prove this idea writ large...
this post was submitted on 06 Jan 2025
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