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 colossal heads heads are the earliest known stone monuments from the site. The discovery of one of the Tres Zapotes heads in the nineteenth century led to the first archaeological investigations of Olmec culture, carried out by Matthew Stirling in 1938. Tres Zapotes Monument A (also known as Tres Zapotes Colossal Head 1) was the first colossal head to be found, discovered by accident in the middle of the nineteenth century, to the north of the modern village of Tres Zapotes. After its discovery it remained half-buried until it was excavated by Matthew Stirling in 1939. At some point it was moved