Serpent Mound arguably is the most recognizable icon of ancient America. Therefore, you might be surprised to learn that much about this mound is arguable, including its age.
Serpent Mound was long thought to be an Adena mound, dating to between 800 B.C. and A.D. 100, but opinions shifted in the 1990s when a team of archaeologists obtained radiocarbon dates on charcoal recovered from the mound.
The results seemed to indicate that the Great Serpent was built by the Fort Ancient culture around A.D. 1120. But a study presented at last month’s Midwest Archaeological Conference in Columbus suggests it might be an Adena mound after all.
Archaeology | Scientists disagree on age of Serpent Mound