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This paper analyses a collection of engraved plaques from Golfo San Matías (Río Negro province) in order to assess design recurrences which might point to the presence of ornamentation rules and/or visual information coding among the hunter-gatherer peoples who produced and used them. Then, 170 plaques from Patagonia and other regions of Argentina are systematically compared using the presence of shared motif types as the main criterion. Data are assessed using a theoretical model with expectations which link design variability/standardization, ornamental laxity/structuration and informational heterogeneity/redundancy. Results show that plaques display low design standardization, which is compatible with a low redundancy communicative function (heterogeneous content) and/or with an ornamental function with lax rules. Moreover, the shared repertoires document several inter-regional links, which are verified using different lines of archaeological evidence. [ABSTRACT FROM AUTHOR]

This paper analyzes plant processing through lithic instruments from a multi-proxy approach for hunter-gatherers contexts of Patagonia. This region presents an archaeobotanical record reflecting the use of diverse species and plant organs, as well as abundant lithic record with evidences of plant processing in different occupational periods. An experimental program combining plant micro-residues studies of two taxa common in the archaeological record with the use-wear analysis of lithic material is proposed here in order to generate functional, technological and methodological interpretations. Cell elements, stains and traces of use are characterized. The program was applied to a sample of different archaeological instruments of the Central plain and the North coast of Santa Cruz province. Micro-residues and use-wear traces identified from these artifacts, together with other contextual information allow us to infer diverse plant processing and manufacture practices. [ABSTRACT FROM AUTHOR]