Paleogeomorphology of the Pacific Ocean at Late Cretaceous

Abstract

A paleo-geomorphological map and a morphostructural scheme of the floor of the Late Mesozoic basin have been compiled using the paleo-bathymetric map of the Pacific (76 mln. y. B.P.) as the base map. Some results of the paleo-geomorphological analysis are stated. A considerable difference has been established in the spatial distribution of the main ocean floor structures (deep basins and mid-oceanic ridges) from the present one. A typical feature of the Pacific paleo-geomorphology is a series of big seamounts and guyots. The oceanic crust's age and sedimentary mantle at the central oceanic basin are shown at the map with variations of conventional signs.