<P> Tlatilco and Tlapacoya, major centers of the Tlatilco culture in the Valley of Mexico, where artifacts include hollow baby - face motif figurines and Olmec designs on ceramics . </P> <P> Chalcatzingo, in Valley of Morelos, central Mexico, which features Olmec - style monumental art and rock art with Olmec - style figures . </P> <P> Also, in 2007, archaeologists unearthed Zazacatla, an Olmec - influenced city in Morelos . Located about 25 miles (40 kilometers) south of Mexico City, Zazacatla covered about one square mile (2.6 km) between 800 and 500 BCE . </P> <P> Teopantecuanitlan, in Guerrero, which features Olmec - style monumental art as well as city plans with distinctive Olmec features . </P>

Where were the olmec and mayan civilizations located