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is paper aims to present the first record of micro vegetable remains in grinding-stone tools found in hunter-gatherer contexts located in Laguna Azul (Somuncurá plateau, Argentina). These grinding-stone tools resulted from excavations of two hunting blinds (known as “parapets”) related to late Holocene radiocarbon dates of 1756 ± 28 years BP (D-007084; δ 13C = 20.2‰) and 1906 ± 26 years BP (D-007085; δ 13C = −19.8‰). The combination of micro-wear and starch grains studies allows us to discuss the autochthonous and allochthonous vegetation processing activities. From these remains, four types of vegetation with nutritive potential were identified:  Chenopodaceas ,  Amaranthaceas ,  Prosopis  sp. and  Araucaria  sp. The grinding stone tools’ microscopic analysis gave evidence of the specific processing motions employed. This evidence-based data enables us to discuss the relationship between the hunter-gatherers and their environment during the late Holocene and also to establish new assumptions about circuits of mobility and communication.

lithic technology

New Evidence of Grinding Activities in Patagonian Steppe during the Late Holocene (ca. 2000 Years BP): the Laguna Azul Site (Somuncurá Plateau, Río Negro Province, Argentina)