In 1960, Dr. G. Edward Lewis of the United States Geological Survey, visited the Lamb Spring site, a pre-Clovis prehistoric Paleo-Indian archaeological site located in Douglas County, Colorado with the largest collection of Columbian mammoth bones in the state, and identified mammoth tusks and bones from the Pleistocene period.
In 1960, Dr. G. Edward Lewis of the United States Geological Survey, visited the Lamb Spring site, a pre-Clovis prehistoric Paleo-Indian archaeological site located in Douglas County, Colorado with the largest collection of Columbian mammoth bones in the state, and identified mammoth tusks and bones from the Pleistocene period.