9,000-Year-Old Structures Deep Beneath the Great Lakes Reveal Archaeological Evidence of an Ancient “Lost World”

Key Points:

• Since 2008, researchers led by University of Michigan archaeologist John O’Shea have been investigating unusual stone structures found over 100 feet beneath Lake Huron, revealing evidence of 9,000-year-old human activity from the late Paleoindian period.
• These underwater features, including campsites, hunting pits, drive lanes, and stone tool caches, are linked to ancient caribou hunters who lived on the Alpena-Amberley ridge, a now-submerged land bridge that once connected Michigan and Ontario.
• The discovery is significant as these structures are the earliest known human-made features found at the bottom of the Great Lakes, preserved without disturbance by farming or modern development, offering unique insights into prehistoric life and environmental conditions.
• The research was inspired by parallels with Siberian reindeer herding practices, leading to the identification of a 1,148-foot caribou drive lane similar to those still used in subarctic Canada, and was supported by sonar and underwater vehicle technology.
• Findings from this ongoing study have helped fill gaps in understanding the transition between Paleo-Indian and Archaic periods in North America, with results published in key academic outlets including the Proceedings of the National Academy of Sciences.