the earliest traces of construction in the area of the plaza of the seven temples consist of the first version of the e-group temple complex facing onto the lost world plaza. this phase of construction has been dated to between 650 and 550 bc. the earliest evidence of occupation of the plaza itself dates to the late preclassic between 400 and 200 bc, and is related to the cap of black earth immediately overlying the bedrock, with archaeological materials being accidentally introduced by the first inhabitants. the first structure to be built in the plaza dates to about this time, when a small circular platform was erected upon the thin stucco floor that was the first formal levelling of the plaza. this platform stood high and measured across. the remains of this building were found under the surface of the central patio, in front of temple 5d-95. ash was found upon the southern part of the platform and it is believed that the structure was either an early residence or an altar.