Five major arguments are put forth that challenge the K-Pg boundary as the Flood/post-Flood boundary: (1) the presence of the Paleocene Whopper Sand in the Gulf of Mexico, (2) the tremendous amount of Cenozoic sediment deposited globally, (3) the fact that the thickest and most extensive coal seams are found in Cenozoic sediments globally, (4) the identification of uninterrupted carbonate deposition across the K-Pg boundary upward through Miocene strata across North Africa and the Middle East, including Iraq, and (5) the tremendous amount of rapid ocean crust/seafloor spreading that continued right across the K-Pg boundary and through much of the Cenozoic up to the Pliocene, with no indication of a significant change in velocity. These data collectively establish that the Flood/post-Flood boundary had to have been much higher in the Cenozoic rock record, at least as high as the top of the Miocene. The Tertiary (Paleogene and Neogene) likely represents the receding-water phase of the Flood. The results of this paper also call into question much of the claimed paleontological evidence for a K-Pg Flood/post-Flood boundary, including the evolution-saltation process that has been recently proposed.