Many archaeologists consider the Clovis/Pre-Clovis debate to be resolved, but most arguments in favor of a Pre-Clovis occupation of the Americas rely on the existence of one or a few anomalous archaeological sites. In this talk, Dr. Surovell will test the Clovis-first hypothesis by examining the stratigraphic integrity of stratified, multi-component sites across North America, from eastern Beringia in the north to Texas in the south. Dr. Surovell will show that the only sites older than Clovis with large numbers of artifacts and high levels of stratigraphic integrity exist north of the continental ice sheets. Furthermore, the first stratigraphically discrete archaeological components with more than a handful of artifacts appear in the Clovis period. This continent-wide patterning in the archaeological record provides clear and unambiguous support for the Clovis-first hypothesis.