microblades found at Thunderbird site are rare and linked to a few other sites, which include the Williamson Site in Dinwiddie County. The Thunderbird site was originally located a great distance from the coast in the Late Pleistocene epoch, but it is now much closer to the coast due to rising sea levels and when occupied, seasonality would have been greater than at present. Significant findings It is believed that the Thunderbird site had a large population due to the vast number of artifacts discovered. This contradicts earlier views that Paleoindian peoples lived in small groupings except for the occasional large gathering for a few weeks at a time to maintain kinship networks as well as share food source knowledge. The Thunderbird site is known for Clovis points, a projectile point that has bifacial flaking. Bifacial flaking is the knapping of a point on both sides to create a blade. These points can be found across most of North America. See also Clovis List of National Historic Landmarks in Virginia National Register of Historic Places listings in Warren County, Virginia References Further reading Books Noel D. Justice (1987). Stone Age Spear and Arrow Points of the Midcontinental and Eastern United States. Indiana: Indiana University Press. David G. Anderson and Kenneth E. Sassaman (1996). The Paleoindian and Early Archaic Southeast. Alabama: University Alabama Press. C. Britt Bousman and Bradley Jay Vierra (2012). From the Pleistocene to the Holocene: Human Organization and Cultural Transformations in Prehistoric North America. Texas: Texas A&M University Press. William M. Gardner (1974). The Flint Run Paleoindian Complex: Pattern and Process During the Paleoindian to Early Archaic. In The Flint Run Paleoindian Complex: A Preliminary Report 1971-1973 Seasons. Archaeology Laboratory, Catholic University of America. Papers William M. Gardner (1983). Stop me if you've Heard This One Before: The Flint Run Paleo-Indian Complex Revisited. (Archaeology of Eastern North America) 1983. p. 49-64 David J. Meltzer (1988). Late Pleistocene Human Adaptations in Eastern North America. (Journal of World Prehistory) 1988. p. 1-52 David G. Anderson and Kenneth E. Sassaman (2012). Recent Developments in Southeastern Archaeology: From Colonization to Complexity. (Society for American Archaeology. (The SAA Press) 2012. Mary Lucas Powell (1989). Thunderbird Site Threatened. (Southeastern Archaeological Conference Newsletter Vol. 31, No. 2 University of Kentucky, Lexington KY) 1989. Howard A. MacCord, Jr. (1975). Archaeology in Virginia: Data-Gathering is Still Fundamental and Necessary (Archaeology of Eastern North America, Vol. 3) pp.