Other Work
Stirling began searching for links between Mesoamerican and South American cultures in Panama, Ecuador, and Costa Rica from 1948 to 1954. He was also the chief organizer of the seven-volume Handbook of South American Indians.
He conducted excavations in the Linea Vieja lowlands of Costa Rica in the 1960s. Concentrating on tombs, he dug at five sites between Siquirres and Guapiles, and published a series of C- 14 dates ranging from 1440 to 1470 A.D, and arranged much of the pottery excavated in an approximate chronological sequence.
In the Sierra de Ameca between Ahualulco de Mercado and Ameca, Jalisco, a large number of stone spheres, many of which are almost perfectly spherical, can be found. Their generally spherical shape led people to suspect they were manmade stone balls, called petrospheres, created by an unknown culture. In 1967, Stirling examined these stone spheres in the field. As a result of this examination, he and his colleagues hypothesized that they were of geological origin. A later expedition and subsequent petrographic and other laboratory analyses of samples of the stone balls confirmed this suspicion. Their interpretation of the data collected in both field and laboratory is that these stone balls were formed by high temperature nucleation of glassy material within an ashfall tuff, as a result of tertiary volcanism.
Read more about this topic: Matthew Stirling
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