sentences:  Weigand and Mountjoy formally mapped Los Guachimontones for the first time in 1974.This map included the two ceremonial centers at the site and a number of terraces and house mounds.Weigand continued working in the Tequila Valleys region for three decades documenting dozens of Teuchitlán Culture sites with guachimontones, Mesoamerican ballcourts, house mounds, and shaft and chamber tombs.