Abstract
We present the results of a combined rock-magnetic and archeomagnetic study carried out on ceramic samples of the Buenavista archeological site, Valle de Ojocaliente, Zacatecas. Based on archeological considerations, it is believed that the main sedentary occupation of the site took place during the Epiclassic period of the Mesoamerican chronology. Ten out of fifteen ceramic fragments were selected for Thellier–Coe archeointensity experiments on the basis of magnetic properties. According to the mean archeointensity values obtained samples were divided in two groups: Group (I) yielded intensities varying from 40.3±1.6 to 45.6±1.1μT, with an average value of 42.7±2.4μT. Group II shows internal variation from 28 to 31μT, and a corresponding mean value of 30μT. Based on the average values, the most probable archeomagnetic age for group I lies in the interval [647AD 855AD], which is in excellent agreement with the estimated chronology of the site. In regard to group II, such a low AI value is not predicted by any of the available global models for Mesoamerica for the last 3kyears. Thus, under the geophysical point of view, an earlier date and/or different provenance for these pieces are possible.
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