At the site of the graves in the town of Jaltipan, southeast of Veracruz, archaeologists also found clay figurines, jade beads, mirrors and animal remains, according to the National Anthropology and History Institute, or INAH.
Researchers believe the settlement was occupied from around the first century A.D. until A.D. 600 or 700. Little is known about the people who lived there. The skeletons are set to be analyzed so that researchers can learn about how they were treated for burial.
"All that is known so far is that of the 30 burials, two at least belong to infants," explained archaeologist Alfredo Delgado in a statement from INAH.
Deer antlers and bones that may belong to dogs, coyotes, deer, fish and birds were buried with the bodies, perhaps as animal companions for the underworld, the researchers said. There's also evidence that the inhabitants of the site were fossil collectors; among the numerous prehistoric remains were the fossilized teeth of a long extinct Megalodon-type shark.