Olmec colossal heads by Matthew Stirling in 1938 spurred the first archaeological investigations of Olmec culture. Seventeen confirmed examples are known from four sites within the Olmec heartland on the Gulf Coast of Mexico. Most colossal heads were sculpted from spherical boulders but two from San Lorenzo Tenochtitlán were re-carved from massive stone thrones. An additional monument, at Takalik Abaj in Guatemala, is a throne that may have been carved from a colossal head. This is the only known example from outside the Olmec heartland. Dating the monuments remains difficult because of the movement of many from their original contexts prior to archaeological
Olmec alternative origin speculations Olmec alternative origin speculations Olmec alternative origin speculations are non-mainstream theories that have been suggested for the formation of Olmec civilization which contradict generally accepted scholarly consensus. These origin theories typically involve contact with Old World societies. Although these speculations have become somewhat well-known within popular culture, particularly the idea of an African connection to the Olmec, they are not regarded as credible by mainstream researchers of Mesoamerica and are considered fringe theories. The great majority of scholars who specialize in Mesoamerican history, archaeology and linguistics remain unconvinced by alternative origin speculations. Many are more critical and regard the promotion