collier’s final exhibit at the field museum was "ancient ecuador: culture, clay and creativity, 3000-300 b.c." most of the pieces in the exhibition were borrowed from a private collection in guayaquil, ecuador and focused on ceramics from ecuadorian coastal prehistory. collier co-authored the exhibit catalog with donald lathrap and he made sure that the catalog, along with the exhibit labels, would be in both spanish and english. the exhibition traveled to several cities in the united states before becoming a permanent exhibit at the museo arqueologico of the banco central del ecuador in guayaquil.