In the geological past, variations in the sea level are mainly due to changes in the climate. So, in the glaciations of the pleistocene Epoch, the sea level went down by several meters, leaving the continental shelves under the meterorization and erosion process. Afterwards, when the melting of the continental glaciers took place great volumens of waters returned to, the oceans giving, rise to an increase in sea level. These changes in the sea level had affected the Cumana shelf, and it is estimated that origen of the gulf occurred between 800.000 and 1.000.000 years B. P.