On July 15th, 2009, Time Team America visits one of the most controversial sites in North America: the Topper site, which is believed by its excavator to contain a 20,000-50,000 year old preclovis site.
Waters, Michael R., Steven L. Forman, Thomas W. Stafford Jr., and John Foss 2009 Geoarchaeological Investigations at the Topper and Big Pine Sites, Allendale County, Central Savannah River, South Carolina. Journal of Archaeological Science 36(7):1300-1311. As far as I'm aware, this is the only peer-reviewed paper on Topper published to date. It details the stratigraphy and presents a suite of AMS and thermoluminescence dates for it; but concludes that the human origin of the "smashed core and microliths" preclovis occupation has not been proven.
- Time Team America: Topper site, at PBS where you can watch the video in its entirety after July 15,2009
- Time Team on About.com
- Topper: The Allendale Expedition, official homepage of the Topper site
- David Anderson and Michael Faught's map "Paleoindian Database of the Americas"
- Why 50,000 is a Crazy Date for Topper, which explains the hurdles the Topper site needs to scale to be accepted.
- Clovis Culture, a description of the sites and living style
- PreClovis Culture, the evidence and (generally) accepted sites
- Clovis, Black Mats, and Extraterrestrials, the theory about a cometary explosion over the Canadian ice sheet