A
large deep pit containing Grave 13 was encountered along the route of the
looters' tunnel. It was located approximately 9 m west of the pyramid's
center and positioned exactly on the east-west centerline of the pyramid
(General map). The pit was quadrangular in form,
excavated into the tepetate. It was filled after the bodies were placed
in it, and no other structure appears to have been built in association
with it. The grave was later disturbed by looters and subsequently refilled
as they continued their exploratory tunnels toward the north, south, and
west. Only a small portion of the original pit fill was identified in our
excavations, near the western edge. The material used for this fill was
the same as that using in forming the rubble fill of the pyramid, suggesting
that grave preparation was integrated into the initial stages of pyramid
construction. There is no indication that the grave was reused. The remains
of one complete and one partial skeleton were uncovered in the undisturbed
fill of the pit. They were in anatomical position and in fairly good condition.
Impressions of bones on subsoil floor were faintly visible in the disturbed
area, confirming that the pit had contained a multiple burial. Above
this floor was a layer of loosely laid rocks in which a large number of
fragmented bones and grave offerings were recovered.
The complete skeleton of the single individual discovered in the original
fill (photo right) was of an unusually robust adult male, buried face-down
with extremely flexed knees tucked under the chest. He possessed unusual
and rather fine ornaments including a pair of greenstone ear spools of
an unusually large size, twenty-one large greenstone beads, a so-called
"Tlaloc" type nose pendant, and an obsidian eccentric (photo
below). Although the high quality of the associated objects suggest high
social status, it is unlikely that he was the principal occupant of this
multiple burial as he was located at the western edge of the pit.
Apart from those found in Grave 12 and 13, a large number of bone fragments
and offerings was found in the fill along the floors of the Looters' Tunnel.
They were interpreted as belonging originally to the individuals buried
in Graves 12 and 13, according to the stratigraphy of the looters' tunnel.
As the looters only disturbed these two graves, all of the artifacts found
in the looters' tunnel probably belonged to them. However, it is also possible
that a few of them, particularly the pottery, came from other caches that
had been looted, but remain undocumented.