continued for several centuries. These evolved into more complex cultures of the Regional Developmental Period of 200 and 300 BCE. References Bibliography Zeidler, J. A. "The Ecuadorian Formative." Helaine Silverman and William H. Isbell, eds. Handbook of South American Archaeology. New York: Springer, 2008. . External links Chorrera ceramics, National Museum of the American Indian Chorrera Culture Pre-Columbian cultures Indigenous peoples in Ecuador Indigenous peoples of the Andes Archaeology of Ecuador 2nd millennium BC Archaic period in the Americas