The Clovis culture (sometimes referred to as the Llano culture) is a prehistoric Paleoindian culture that first appears in the archaeological record of North America around 11,500 rcbp radiocarbon years ago, at the end of the last glacial period. Archaeologists' best guess at present suggests this is equal to roughly 13,000 calendar years ago. The Clovis culture is thought to have lasted between 200 and 800 years, depending on the source consulted, with an average estimate of around 500 years, starting about 13,000 years ago. The Clovis culture was replaced by several more localized regional cultures from the time of the Younger Dryas cold climate period onward. Post-Clovis cultures include the Folsom tradition, Gainey, Suwannee-Simpson, Plainview-Goshen, Cumberland point, and Redstone. Each of these is commonly thought to derive directly from Clovis, in some cases apparently differing only in the length of the fluting on their projectile points. Although this is generally held to be the result of normal cultural change through time, numerous other reasons have been suggested to be the driving force for the observed changes in the archaeological record, such as an extraterrestrial impact event or post-glacial climate change with numerous extinctions.
The Clovis people, one of the several distinct Paleoindian groups mentioned above, were regarded as the first human inhabitants of the New World since the discovery of several Clovis sites in western North America in the 1930s. Clovis people were thought to be the ancestors of all the indigenous cultures of North and South America. However, this view has been contested over the last thirty years by several archaeological discoveries, including sites like Cactus Hill in Virginia, Paisley Caves in the Summer Lake Basin of Oregon, Meadowcroft Rockshelter in Pennsylvania, and the Monte Verde and Cueva Fell sites in Chile.
The culture was originally named for a small number of artifacts found in 1936 and 1937 at Blackwater Locality No. 1, an archaeological site near Clovis, New Mexico. People began collecting artifacts at this site in the late 1920s but artifacts and animal remains that had not moved since the Pleistocene were not recovered until 1936. The in situ finds of 1936 and 1937 included stone Clovis points, two long bone points with impact damage, stone blades, a portion of a Clovis blade core, and several cutting tools made of stone flakes. Clovis sites have since been identified throughout much, but not all, of the contiguous United States, as well as Mexico and Central America, and even into Northern South America.