Abstract Tiwanaku is among the most prominent sites in the Andes. Despite nearly a century of research, it remains unclear when the site was founded, currently thought to be around 300 B.C. Excavations in 2008 in the Kk'arana sector present patterns suggested by previous research the earliest material culture is from the first part of the Late Formative period. Tiwanaku was likely founded during the first or second century A.D. This refinement to the site's history carries implications for clarifying the ceramic chronology and the relatively rapid process of state emergence. Tiwanaku se encuentra entre los sitios mas preeminentes en los Andes, pero despues de casi un siglo de investigacion, permanece poco clara la fecha de su fundacion, sugerida alrededor de 300 a.C. Esta se basa en la presencia de fechados radio-carbonicos tempranos, los cuales no estan asociados con material cultural, y por tanto no se corresponden con ocupaciones humanas del sitio. Excavaciones recientes en el sector de Kk'aran...