The plaza in the classic period, after 700 BCE, is bounded on three sides by major Temples A, B, and C. The plaza is perfectly circular and is close to in diameter, with a floor consisted of pillow-shaped pavers of yellow diatomite. It appears that a center line of black limestone blocks runs on its architectural east-west axis. Walls of the plaza were constructed of cut stone, principally granite, laid in courses of varying width. The two broadest courses were carved in arcs closest to the western staircase and in two pairs of terminal stones flanking the eastern staircase.