Eric Walker added 2019-10 - New research supports hypothesis that asteroid contributed to mass extinction - Wits University to Younger Dryas impact hypothesis (YDIH), Robberg stone artefact industry and Clovis culture

Eric Walker added First Americans Arrived More Than 16,000 Years Ago, According To Find In Idaho - Dead Things : Dead Things to a number of topics

Eric Walker added Ancient DNA confirms Native Americans’ deep roots in North and South America | Science | AAAS to a number of topics

Eric Walker added a number of links to Clovis culture, and added Clovis culture to Upper Paleolithic

Eric Walker added a number of topics and a number of links to Upper Paleolithic, and added Upper Paleolithic to Paleolithic