Scientists have discovered what might be a "Lost World" of prehistoric caribou hunting culture on the bottom of Lake Huron.

From this story in the Montreal Gazette:
The recovery of a mysterious wooden pole at the bottom of Lake Huron is fuelling excitement among U.S. and Canadian researchers that they have found more evidence of a "lost world" of North American caribou hunters from nearly 10,000 years ago.

The scientists believe that these prehistoric aboriginal people - who would have been among the earliest inhabitants of the continent - had a "kill site" along a ridge straddling the present-day U.S.-Canada border that was eventually submerged by rising waters when the glaciers melted at the end of the last Ice Age.

Now drowned under about 35 metres of water in Lake Huron, the Alpena-Amberley Ridge is named for the Michigan and Ontario towns that respectively mark the western and eastern ends of the 160-kilometre-long and 16-kilometre-wide feature. The theory that the ridge was an ancient hunting ground was first announced in 2009 after the discovery of lake-bottom rock features that appeared to have been arranged by human hands to herd migrating caribou into narrow corridors ideal for spear hunting.