The 20 fossils have been found at four sites in the Lukeino Formation, located in Kenya: of these, the fossils at Cheboit and Aragai are the oldest (6.1 Ma), while those in Kapsomin and Kapcheberek are found in the upper levels of the formation (5.7 Ma).
Os 20 restos fósiles atopáronse en catro sitios da Formación Lukeino: destes, os fósiles de Cheboit Aragai son os máis antigos (de 6,1 Ma), mentres que os de Kapsomin e Kapcheberek atopáronse nos niveis superiores da formación (de hai 5,7 Ma).