alaska american antiquity american bison american journal of human genetics american scientist archaeology archaeology of the americas atlantic ocean aucilla river before present bering strait beringia biface big eddy site bison antiquus blackwater draw bruce bradley burnet cave cnn cactus hill california academy of sciences canada central america channel islands of california chile clovis comet clovis point comet dennis stanford digital object identifier extinction first nations folsom point folsom tradition france glacier great lakes ground sloth haplogroup horse in situ indigenous peoples of the americas international standard serial number inuit lake agassiz lake chalco lascaux last glacial period mammoth mark twain national forest mastodon meadowcroft rockshelter megafauna mexico midden mitochondrial dna models of migration to the new world monte verde new mexico new world north america obsidian use in mesoamerica online computer library center oregon pacific ocean paisley caves paleo-indians pennsylvania population bottleneck proceedings of the national academy of sciences rocky mountains siberia solutrean solutrean hypothesis south america south carolina spear stone age tapir thermohaline circulation united states university of new mexico university of new mexico press virginia younger dryas younger dryas impact event