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“Upwarp” glitches usually stem from the ceiling in some capacity, pulling the player up.

Louisiana and Florida were the last areas to emerge wholly from the sea,— Florida being formed by a broad transverse upwarp of the continental delta at the opening of the Miocene, forming first an island, which afterwards was joined to the mainland.

Manifestly this upwarp occurred since the peneplain was formed; it is later than the Mesozoic, and the vast dissection which the peneplain has suffered since its uplift must belong to the successive cycles of Cenozoic time.