Canadian scientists used drill cores to gather evidence of ancient Aboriginals in Ontario Lake (Canada). They found over a 150 small flakes of quartz which points to manufacturing of tools.
"The discovery of now-submerged archeological sites is expected to provide breakthroughs in the coming years for researchers trying to trace the initial peopling of the Americas via Pacific coastal routes in present-day Alaska, British Columbia, Washington, Oregon and California." (Source)Source: Traces of ancient aboriginals found in Ontario lake bottom
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