1. New archeological excavations in San Marcos cave.
New archeological excavations in San Marcos cave. (A) The caves of San Marcos (cave on the left) and Tecorral (cave on the right). (B) Archaeobotanical sampling in San Marcos cave conducted in February (C) Maize specimens SM3 dating 5,280–4,970 cal. y B.P. (Left) and SM5 dating 5,300–4,980 calibrated y B.P. (Right). (Scale bar, 1.5 cm.) (D) Maize specimens SM9 dating 5,280–4,970 cal. y B.P. (Left) and SM10 5,300–5,040 cal. y B.P. (Right). (Scale bar, 43 mm.)‏
Miguel Vallebueno-Estrada et al. PNAS doi: /pnas
©2016 by National Academy of Sciences