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Abstract Aerial reconnaissance and photography have established the existence of extensive tracts of ridged fields and planting platforms (bancos), apparently of pre-Columbian origin, in the overflow lands behind the natural levees of the Rio Guayas immediately north and east of Guayaquil, Ecuador. These vestiges of an ancient, labor-intensive agricultural system are similar in character to others that have been described in Bolivia, Colombia, and Surinam.
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