A different tale was told by the Nahuatl-speakers of Tetelcingo, Morelos, according to whom Iztaccíhuatl was the wife of Popo, but Xinantécatl wanted her, and he and Popocatépetl hurled rocks at each other in anger. This was the genesis of the rocky mountain ranges of the continental divide and the Trans-Mexican volcanic belt that lie between the two mountains. Finally Popocatépetl, in a burst of rage, flung an enormous chunk of ice, decapitating the Nevado de Toluca. This is why the Nevado is flat-topped, with wide shoulders but no head. Conceivably this legend preserves the memory of catastrophic eruptions.