No, it's more reasonable to believe that the cyclic structure of the layers is due to a local depositional enviroment within a massive global flood that sorted out the sand and the clay in the pattern as found.
Probably, much faster than that.
How fast does clay settle in water? I'll let you consider "clay" to mean only particles smaller than four microns in diameter and not confine you to phyllosilicates. Give me a number - centimeters per second, or units of your choosing.
The oil industry does rely on forams a lot in appropriate formations - like the US Gulf Coast. I once spent several days on a gas well that had been drilled specifically to the Bolivina mexicana zone - 'cause the geologists knew that's where the gas was.
The weight of the water sank down the thin crusts into the molten core, pushing up the mountain ranges like the Himalayas as the tetonic plates gave way...
Which is more dense, Buzsaw - water or rock? Will a mile of water balance a mile of rock?