Moon Pyramid from south-east corner of the Mood Plaza. Excavations from 1998 to 2004 revealed that there are seven superimposed structures. The earliest was built around 100 A.D. and the latest (the one we see here) about 400 A.D. The first three were relatively small and the fourth, built around 300 A.D., was very much bigger.
The main pyramid has four terraces supporting a low platform and a (now vanished) building. The surfaces visible here are all reconsolidated and somewhat rebuilt. Plaster finish and paint has not been applied but probably existed originally. Three frontal terraces project outward and flank the stair. Then, later, another frontal platform was added, the plataforma adosada. This has five terraces with tablero talude profiles. Each flight of the stair has lateral ramps known as alfardas. At the foot of the stair, in the Moon Plaza is a low, square platform. This too was added later.
To-day the over-all appearance is a sombre cityscape of dark stone. But originally the appearance would have been very different. All surfaces, including pavement, were finished with shiny plaster brightly painted. The glare would have been so great that one would have to squint to look at the scene. It's unlikely that there would have been any casual visitors to this area.
A summary of the excavations and findings, including several rich burials, and articles on artifacts and skeletal remains, appear in Ancient Mesoamerica Vol. 18, No.1, Spring, 2007.