Maize pollen sample recovered from Yotoco Phase pollen core, at a depth of 71-81 cm (Monsalve 1985; Cardale Schrimpff 2005).
Bray, W. 2005 Craftsmen and Farmers: The Archaeology of the Yotoco Period. In Calima and Malagana: Art and Archaeology in Southwestern Colombia, edited by M. Cardale Schrimpff, pp. 101-140. Pro Calima Foundation, Bogotá.
Cardale Schrimpff, M. (editor) 2005 Calima and Malagana: Art and Archaeology in Southwestern Colombia. Pro Calima Foundation, Bogotá.
Monsalve, J. G. 1985 A Pollen Core from the Hacienda Lusitania. Pro Calima 5:40-44.