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 religion figures, with their links to the Olmec deities or supernaturals providing legitimacy for their rule. There is also considerable evidence for shamans in the Olmec archaeological record, particularly in the so-called "transformation figures". Specifics concerning Olmec religion are a matter of some conjecture. Early researchers found religious beliefs to be centered upon a jaguar god. This view was challenged in the 1970s by Peter David Joralemon, whose Ph. D. paper and subsequent article posited what are now considered to be 8 different supernaturals. Over time Joralemon's viewpoint has become the predominant exposition of the Olmec pantheon. The study of Olmec