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And I said later that it is not NOW sea floor because it sank after the strata of the geological column were in place, and the strata on the sea floors now are not the geological column.
Well you’re wrong about all of that.
Obviously it is sea floor because the Gulf of Mexico is a sea. Nothing else is needed.
Obviously the strata are part of the geological column because they exist.
And, for, your information the rifting that formed the Gulf of Mexico started in the late Triassic, so obviously even the Jurassic strata are later than that.