The following food and plant materials were found on the internal and external surface of the sherds: Zea mays (corn), Prosopis, Poaceae phytoliths, and Fungal zoospores and hyphae. These findings suggest that there was some trading between agricultural groups of Andean region, in South-central Chile, with and the hunter-gathers of La Pampa. West-Central Patagonia There are two sites of interest for studying hunter gatherers in the Holocene in West-central Patagonia; these sites include the cave sites of El Chueco 1 (11,500–180 cal BP) and Baño Nuevo 1 (10,800–3,000 cal BP). The El Chueco 1 cave is located at 44°29′36′′S; 71°11′13′′W. The Baño Nuevo is located at 45º17′ S, 71º32′ W. The west-central Patagonia region where these sites are located typically have a dry climate. The average rainfall for this area is 400 mm and the average temperature is 7 °C. With regard to the stability of the region, "palaeoenvironmental reconstructions for the region indicate no major changes in the distribution of vegetation since approximately 8,000 calBP." Samples for these two sites gathered information about plant micro-remains from the Pleistocene-Holocene transition to the Late Holocene. The number of different types of plants from the stratigraphy sampled varied between the two sites, with EC1 exhibiting fewer plant micro-remains in the Early Holocene with a fairly steady increase into the Late Holocene, while BN1 exhibited a greater range of plant micro-remains in the Early Holocene and there was a steady decline in percentage of plant micro-remains in the sample. The micro-remains of the plants suggest that the following plants were in use at these sites: Alstroemeriaceae, Apiaceae, Apiaceae, Berberis, Brassicaceae, Brassicaceae, Calceolariaceae, Carex sp., Chenopodiaceae, Convolvulaceae, Cyperus sp., Cyperaceae, Eleocharis sp., Ericaceae, Fabaceae, Fragaria chiloensis, Galium sp., Lamiaceae, Libertia sp., Malvaceae, Phacelia sp., Poaceae, Polygonaceae, Portulaceae, Rubus sp., Scirpus sp., and Uncinia sp. with a large number of the plants samples unable to be identified. Sierras de Córdoba In Central Argentina, there is some evidence of agriculture in the region by 1000 BP. The Sierras de Córdoba, in Central Argentina, are west of the modern city of Córdoba and east of the Andean range separating Argentina from Chile. In one study, 15 sites in the Sierras de Córdoba were analyzed for plant macroremains and microremains. The following results were obtained from the Late Holocene and into the Pre-Columbian period. Quebrada Norte 7: Sracomphalus mistol, Lithraea molloides, Zea mays, Condalia sp., Prosopis sp., Schinua