The process of sea-floor spreading has caused some fragments of continental material to be separated from the main continental mass. The heat production in the fragments is greater than that in the surrounding oceanic or transitional crust; consequently, the rate of crustal cooling with time is diminished, and the rate of subsidence of the crust is retarded near the continental fragment. Such dislocated fragments will exhibit sustained topographic prominence over geologic time.
A numerical thermal model applied to the Ocala Uplift in northern Florida compares well with the observed elevations of the pre-Cretaceous surface. Other available geophysical data support the existence of zones of anomalous crust north and south of the uplift.