“…The pre-ceramic record shows that the Atlantic coast of Colombia served as a corridor and population dispersion in two main directions: part of these groups addressed in West-East direction following the route of the Atlantic coast, surrounding the Guajira peninsula until reach the gulf of Venezuela branching out later in the Amazon (Reichel-Dolmatoff 1965, Langebaek Biological affinities in ancient Northern Andes 157 1992, Jaimes 1999), while the other groups proceeded toward the interandean valleys following a North-South route, aided by the main rivers such as the Atrato (Bedoya & Naranjo 1985), Sinu (Correal 1977), San Jorge (Plazas & Falchetti 1981), the Canal del Dique, the Delta of the Magdalena (Reichel-Dolmatoff 1997, Stahl & Oyuela 2007, and the Ciénaga Grande de Santa Marta (Bischof 1966). This process allowed people to reach other parts of Colombia, such as the Pacific coast and the Macizo Antioqueño (Correal 1989), as well as the higher thermal floors in the Western and Central arms of Andes by following the middle of the Cauca River (Salgado 1986, Salgado et al 1995, Herrera et al 1992, Gnecco 1999 until they reached the Colombian Macizo in the South of the country (Reichel-Dolmatoff 1978, Gnecco & Salgado 1989, Uribe & Lleras 1984. Following the route of the Magdalena River they reached other parts of the Central and East arms of Andes (Schottelius 1946, Correal 1979, Correal & van der Hammen 1977, Castaño & Davila 1984, Cadavid 1989, Henderson & Ostler 2005.…”