Valley of Oaxaca
Occupation of the Monte Albán site continued uninterrupted, but ceramic evidence for Monte Albán II culture indicates that cultural influences from southeastern Mexico were reaching the Zapotec people. On the southern end of the site’s main plaza is a remarkable stone structure called Building J, shaped like an arrow pointing southwest and honeycombed with galleries. Some believe it to have been an astronomical observatory. Incised slabs are fixed to its exterior; these include some older danzantes as well as depictions of Zapotec place glyphs from which are suspended the inverted heads of dead chiefs—surely again the vanquished enemies of Monte Albán. Dates are given in the 52-year Calendar Round, with coefficients for days and months expressed by bar-and-dot numerals, a system that is first known for Monte Albán I and that became characteristic of the Classic Maya. Throughout its long Formative and Classic occupation, the dominant ware of Monte Albán is a fine gray pottery, elaborated in Monte Albán II into the usual Late Formative shapes.