assumed that this pattern was repeated over the rest of the cornice. Both the outer and inner walls of the chamber were painted red several times with no designs. Building B or Pyramid of the Painted Skulls Building B or the Pyramid of the Painted Skulls was centered in a spot a few meters from La Conejera. Later expansions of this pyramid eventually covered La Conejera and the Edificio Rojo built over it. The Pyramid of the Painted Skulls was built between 200 and 350 AD, consisting of seven stepped levels with an adobe nucleus. It was finished with adobe and rock, and smoothed with earth mixed with lime to create a painting surface. The architecture is significant because of its talud-tablero structure, and its mural-decorated walls. This structure was constructed in two phases. The first created a rectangular platform 113 meters by 107 meters. On top of this is a two-story structure, eighteen meters high with stairs on the west. This structure is made of adobe bricks, which stone and clay used in the areas with stairs. Marquina determined that this structure had an east–west orientation, similar to the Pyramid of the Sun, coinciding with the Teotihuacan civilization, and later ceramic studies placed it with Teotihuacan II. Only the murals of the upper two stories of this pyramid have been studied, on the taluds and tableros of the north side as well as those on the northeast corner. The talud has traces of black and the two-meter tableros consist of a frieze measuring 46 cm wide with a double frame or border that juts out from the frieze. This is characteristic of Cholula architecture. These tableros usually have one color as the base, but with stripes of other colors on top, such as yellow, red and blue. The north side is completely free of paint on the left side, but on the right, there are pockets of color remaining. The highest story contains nine skulls painted on it, which the lower one had seven. These skulls were initially thought to be the heads of grasshoppers facing forward, but later studies determined that they depict highly stylized human skulls. These skulls look forward and are painted yellow and red over a black background. Above the skulls are decorative markers that look like arrows, which indicate the direction of the scene. Those on the left side point east, and those on