Pantalasa. Sust. FEM. Hypothetical single ocean surrounding a likewise theoretical undivided continent or supercontinent called Pangaea. According to the theory of continental drift, Alfred Wegener, this enormous mass emerged during the late Paleozoic to early Mesozoic split and originated the current continents. The concept comes from the adjective "bread": all, and the noun 'thálassa, thálassees': cases nominative and genitive singular equivalent to "sea of the sea". IE: all sea.