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the month Laguna Caldera erupted but not precisely the year,” he pointed out.
Eager to find more houses and perhaps the plazas, pyramids, and marketplaces that characterized Maya civilization. Sheets turned to geophysicists for help in “seeing" through the layers of volcanic ash.
He returned to the site last year with geophysicist Hartmut Spetzler of the University of Colorado and three unorthodox archeological instruments: a portable seismograph; a resistivity device that detected what was below the earth's surface; and a ground-penetrating radar unit. To move the sophisticated radar unit as it operated, a form of local transportation was used: a cart pulled by oxen.
On Edge of Village
To everyone's surprise, all three systems worked and
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