Gas chromatography
Prior to contact with colonists, alcohol use and production were mainly concentrated in the southwestern United States. In 2007, archaeologist Glenna Dean conducted studies to show that, between AD 828 and 1126, Pueblos in Chaco Canyon were brewing a weak beer made by fermenting kernels of corn. Gas chromatography analysis of 800-year-old potsherds found at Pueblo Bonito in 2006 contained residues consistent with fermented corn products.