In 1931 and 1932, George Vaillant and Sigvald Linné excavated
34 burials and 17 offerings dating to the Early Postclassic period
(a.d. 900–1150). The features were located on the ruins of
the Classic-period site of Teotihuacan and within the boundaries of a
roughly 25–50 ha zone identified by the Teotihuacan Mapping Project
as having a dense Early Postclassic-period occupation. The results of
Vaillant's excavations have not been published. An examination of the
Vaillant–Linné data sheds new light on Early
Postclassic-period mortuary ritual and social organization. The
identification of several types of burials shows that local people
conducted primary and secondary mortuary rituals and indicates the
presence of at least two social strata at the site. The content of the
burials and offerings supports a division of the Early Postclassic period
into two local phases, Mazapan (ca. a.d. 900–1000) and
Atlatongo (ca. a.d. 1000–1100/1150), with these
features dating to the earlier phase.