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A significant percentage of lithic artifacts recovered from archaeological sites located in the upper section of the Tapalqué river basin (Olavarría District, Buenos Aires province, Argentina) are made of chert or ftanita. This raw material has been found in three different stratigraphic levels in the lower Precambrian/Palaeozoic sedimentary sequence of Sierras Bayas, Olavarría. In this paper each chert level is characterised using X-ray diffraction and results are compared with samples from surface archaeological sites (Laguna La Barrancosa-2, Laguna Blanca Chica, Cerro Núcleo Central-1 and Arroyo Tapalqué). It is proposed that human groups which inhabited the upper section of the Arroyo Tapalqué river basin during the Late Holocene exploited the second level of chert or ftanita.

Identificación y aprovisionamiento de ftanita o chert en la cuenca superior del Arroyo Tapalqué (Olavarría, provincia de Buenos Aires, Argentina)