In SciPop, all of the continents were once part of the super-continent Pangaea. This is Biblical and it allows us to incorporate plate tectonics and evolution into the creation narrative.
September 1st
August 24th
The Miocene is the Miocene because it's the Miocene. Anything that's not characteristic of the Miocene is assigned to something other than the Miocene. It's a little microcosm of circular reasoning.