The fourth version of the pyramid was built upon a much larger scale; it was built sometime between 200 BC and 200 AD.Laporte 1997, p.339. It stood high and measured across. This represented the greatest leap in volume between successive versions of the pyramid. Once again it was a radial pyramid with auxiliary stairways; the temple had at least eight stepped levels although archaeologists could not determine the exact number due to the destruction wrought upon the summit by the construction of the next (fifth and final) version. It possessed giant masks on the fifth stepped level. Due to the method of construction employed, with weight dispersed across the shorter sides of its stone blocks, the fourth version of the pyramid was structurally weak and it required periodic reinforcement. The architects soon realised their error and the architectural techniques used in the construction of the fourth version were never used again; the fourth version itself remained in use for a relatively short period of time before being replaced by the fifth version.
