The Olmec colossal heads are stone representations of heads sculpted from large basalt boulders. They range in height from 1.17 to 3.4 metres (3.8 to 11.2 ft). The heads date from at least 900 BCE and are a distinctive feature of the Olmec civilization of ancient Mesoamerica. All portray individuals with characteristics corresponding to phenotypes that are still common among the inhabitants of Tabasco and Veracruz. The backs of the monuments are often flat. The boulders were brought from the Sierra de Los Tuxtlas mountains of Veracruz. Given that the extremely large slabs of stone used in their production were transported more than 150 kilometres (93 mi), requiring a great deal of human effort and resources, it is thought that the monuments represent portraits of powerful individual Olmec rulers. Each of the known examples has a distinctive headdress. The heads were variously arranged in lines or groups at major Olmec centres, but the method and logistics used to transport the stone to these sites remain unclear. The heads all display distinctive headgear and one theory is that these were worn as protective helmets, maybe worn for war or to take part in a ceremonial Mesoamerican ballgame.
The discovery of the first colossal head at Tres Zapotes in 1862 by José María Melgar y Serrano was not well documented nor reported outside Mexico. The excavation of the same colossal head 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 many were removed from their original contexts prior to archaeological investigation. Most have been dated to the Early Preclassic period (1500–1000 BC) with some to the Middle Preclassic (1000–400 BC) period. The smallest weigh 5 tonnes (6 short tons), while the largest is estimated to weigh 36 to 45 t (40 to 50 short tons); it was abandoned and left uncompleted close to the source of its stone.
Olmec civilization
The Olmec civilization developed in the lowlands of southeastern Mexico between 1500 and 400 BC. The Olmec heartland lies on the Gulf Coast of Mexico within the states of Veracruz and Tabasco, an area measuring approximately 275 kilometres (171 mi) east to west and extending about 100 kilometres (62 mi) inland from the coast. The Olmecs are regarded as the first civilization to develop in Mesoamerica and the Olmec heartland is one of six cradles of civilization worldwide, the others being the Norte Chico culture of South America, the Erlitou culture of China's Yellow River, the Indus Valley civilization of the Indian subcontinent, the civilization of ancient Egypt in Africa, and the Sumerian civilization of ancient Mesopotamia (Iraq). Of these, only the Olmec civilization developed in a lowland tropical forest setting. The Olmecs were one of the first inhabitants of the Americas to construct monumental architecture and to settle in towns and cities, predated only by the Caral civilization. They were also the first people in the Americas to develop a sophisticated style of stone sculpture. In the first decade of the 21st century, evidence emerged of Olmec writing, with the earliest examples of Olmec hieroglyphs dating to around 650 BC. Examples of script have been found on roller stamps and stone artefacts; the texts are short and have been partially deciphered based on their similarity to other Mesoamerican scripts. The evidence of complex society developing in the Olmec heartland has led to the Olmecs being regarded as the "Mother Culture" of Mesoamerica, although this concept remains controversial.
Some of the Olmecs' rulers seem to have served religious functions. The city of San Lorenzo was succeeded as the main centre of the civilization by La Venta in about 900 BC, with Tres Zapotes and Laguna de los Cerros possibly sharing the role; other urban centres were much less significant. The nature and degree of the control exercised by the centres over a widespread rural population remains unclear. Very fine Olmec art, much clearly made for an elite, survives in several forms, notably Olmec figurines, and larger sculptures such as The Wrestler. The figurines have been recovered in large numbers and are mostly in pottery; these were presumably widely available to the population. Together with these, of particular relevance to the colossal heads are the "Olmec-style masks" in stone, so called because none has yet been excavated in circumstances that allow the proper archaeological identification of an Olmec context. These evocative stone face masks present both similarities and differences to the colossal heads. Two thirds of Olmec monumental sculptures represent the human form, and the colossal heads fall within this major theme of Olmec art.
Dating The colossal heads cannot be precisely dated. However, the San Lorenzo heads were buried by 900 BC, indicating that their period of manufacture and use was earlier still. The heads from Tres Zapotes had been moved from their original context before they were investigated by archaeologists and the heads from La Venta were found partially exposed on the modern ground surface. The period of production of the colossal heads is therefore unknown, as is whether it spanned a century or a millennium. Estimates of the time span during which colossal heads were produced vary from 50 to 200 years. The San Lorenzo heads are believed to be the oldest, and are the most skilfully executed. All of the stone heads have been assigned to the Preclassic period of Mesoamerican chronology, generally to the Early Preclassic (1500–1000 BC), although the two Tres Zapotes heads and the La Cobata Head are attributed to the Middle Preclassic (1000–400 BC).
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