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
Mayan languages Yucatecan languages are Mopan, spoken by around 10,000 speakers primarily in Belize; Itza', an extinct or moribund language from Guatemala's Petén Basin; and Lacandón or Lakantum, also severely endangered with about 1,000 speakers in a few villages on the outskirts of the Selva Lacandona, in Chiapas. Wastek (also spelled Huastec and Huaxtec) is spoken in the Mexican states of Veracruz and San Luis Potosí by around 110,000 people. It is the most divergent of modern Mayan languages. Chicomuceltec was a language related to Wastek and spoken in Chiapas that became extinct some time before 1982. Proto-Mayan (the common ancestor of