La Brújula Verde reports that work along the route of a passenger train uncovered an altar, or momoztli, in central Mexico near the site of Tula, the ancient Toltec capital. The momoztli has been dated to between A.D. 900 and 1150. Archaeologist Víctor Francisco Heredia Guillén of Mexico's National Institute of Anthropology and History said that the structure had at least three tiers. The first tier is a stone base thought to be made of andesite, a type of volcanic rock. These blocks are each about four inches long. The next tier consists of slabs made of the same material,...