Se describen tres piezas dentarias de un mamifero notoungulado, encontradas en estratos de la parte superior de la Formacion Chucal, Altiplano de Arica, norte de Chile (18-19°S). Los caracteres morfologicos permiten referir el material disponible a un Toxodontidae, relacionado con especimenes generalizados de Haplodontheriinae presentes en Argentina, tales como Palyeidodon (= Prototrigodon). Estos ultimos, morfologicamente mas avanzados que aquellos de Edad Mamifero Santacrucense (Mioceno Inferior), proveen evidencias suficientes para asignar al Colloncurense (Mioceno Medio temprano) la edad maxima de los depositos portadores.Three dental pieces of a notoungulate mammal, found in the strata of the upper part of the Chucal Formation, Altiplano of Arica, northern Chile (18-19°S) are described. The morphological characters allow to refer the available material to a Toxodontidae, related to generalised specimens of Haplodontheriinae as Palyeidodon (= Prototrigodon), which are present in Argentina. These specimens, morphologically more advanced than those of Santacrucian Mammal Age (Lower Miocene), give sufficient evidence to assign to Colloncuran (Early Middle Miocene) the maximum age of the deposits where they are present.