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Clovis Culture Information

The Clovis culture (sometimes referred to as the Llano culture[1]) is a prehistoric Paleo-Indian culture, named after distinct stone tools that were found at sites near Clovis, New Mexico, in the 1920s and 1930s. The Clovis culture appears around 11,500 RCYBP (radiocarbon years before present[2]), at the end of the last glacial period, characterized by the manufacture of "Clovis points" and distinctive bone and ivory tools. Archaeologists' most precise determinations at present suggest that this radiocarbon age is equal to roughly 13,500 to 13,000 calendar 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, 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,[3] 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 faunal extinctions.

After the discovery of several Clovis sites in western North America in the 1930s, the Clovis people came to be regarded as the first human inhabitants of the New World. Clovis people were considered to be the ancestors of all the indigenous cultures of North and South America. However, this majority view has been contested over the last thirty years by several archaeological discoveries, including possible sites like Cactus Hill in Virginia, Paisley Caves in the Summer Lake Basin of Oregon, the Topper site in Allendale County, South Carolina, Meadowcroft Rockshelter in Pennsylvania, the Friedkin[4] site in Texas, and the Monte Verde[5] and Cueva Fell sites in Chile. The claim to the oldest human archaeological site known in the Americas belongs to the Pedra Furada human remains and hearths, a site that precedes the Clovis culture and the other sites already mentioned by 19,000 to 30,000 years, but this discovery has become an issue of contention between North American archaeologists and their South American and European counterparts.[6][7][8] In American archaeology most dates older than 10,000 are controversial. They are under intense scrutiny and may change as new dating technologies are developed and existing ones refined.[9]

Contents

Description

Clovis points from the Rummells-Maske Cache Site, Iowa.

The culture was originally named for a small number of artifacts found between 1936 and 1938 at Blackwater Locality No. 1, an archaeological site near the town of 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 most of four stone Clovis points, two long bone points with impact damage, stone blades, a portion of a Clovis blade core, and several cutting tools made on 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.[10]

A hallmark of the toolkit associated with the Clovis culture is the distinctively shaped, fluted stone spear point, known as the Clovis point. The Clovis point is bifacial and typically fluted on both sides. Archaeologists do not agree on whether the widespread presence of these artifacts indicates the proliferation of a single people, or the adoption of a superior technology by diverse population groups. It is generally accepted that Clovis people hunted mammoth as Clovis points have repeatedly been found in sites containing mammoth remains. Mammoth was only a small part of the Clovis diet; extinct bison, mastodon, sloths, tapir, palaeolama, horse (the association of Clovis with horse remains is in dispute as no actual Clovis artifacts have been found in direct association with fossil horse remains) and a host of smaller animals have also been found in Clovis sites where they were killed and eaten. In total, more than 125 species of plants and animals are known to have been used by Clovis people in the portion of the Western Hemisphere they inhabited.

Disappearance of Clovis

Further information: Younger Dryas

The most commonly held perspective on the end of the Clovis culture is that a decline in the availability of megafauna, combined with an overall increase in a less mobile population, led to local differentiation of lithic and cultural traditions across the Americas.[3][11] After this time, Clovis-style fluted points were replaced by other fluted-point traditions (such as the Folsom culture) with an essentially uninterrupted sequence across North and Central America. An effectively continuous cultural adaptation proceeds from the Clovis period through the ensuing Middle and Late Paleoindian periods.[12] It has also been argued that Clovis ended in a very abrupt fashion.

Whether the Clovis culture drove the mammoth, and other species, to extinction via overhunting – the so-called Pleistocene overkill hypothesis – is still an open, and controversial, question. It has also been hypothesized that the Clovis culture saw its decline in the wake of the Younger Dryas cold phase. This 'cold shock', lasting roughly 1,500 years, affected many parts of the world, including North America. It appears to have been triggered by a vast meltwater lake – Lake Agassiz – emptying into the North Atlantic, disrupting the thermohaline circulation.

The largely discredited Younger Dryas impact hypothesis suggests that one or more bolide impacts caused the mass extinction and triggered a period of climatic cooling.[13] The hypothesis proposed that an extraterrestrial object such as a comet exploded in Earth's atmosphere above North America's Great Lakes region about 12,900 years ago,[14] and significantly impacted the human Clovis culture. However, recent published research disputes the quality of the evidence of an extraterrestrial impact.[15][16] Additional possible evidence of comet impact is occurrence of microdiamonds and black mats in a layer of sedimentary rocks of that era,[17] but those observations were not repeated in other analyses, the dates of the layer were disputed, and there was a lack of other supporting evidence, especially the dates and level of megafaunal extinction.[16]

Discovery

Main articles: Burnet Cave and Dent Site

A cowboy and former slave, George McJunkin, found an Ancient Bison (Bison antiquus, an extinct relative of the American Bison) skeleton in 1908 after a flash flood.[18] It was first excavated in 1926, near Folsom, New Mexico under the direction of Harold Cook and Jesse Figgins. On August 29, 1927 they found the first in situ Folsom point with the extinct B. antiquus bones. This confirmation of a human presence in the Americas during the Pleistocene inspired many people to start looking for evidence of Early Man.[19]

In 1929, 19-year-old Ridgely Whiteman, who had been closely following the excavations in nearby Folsom in the newspaper, discovered the Clovis Man Site in the Blackwater Draw in Eastern New Mexico.[18] Despite earlier legitimate Paleoindian discoveries, the best documented evidence of the Clovis tool complex was excavated between 1932 and 1937 near Clovis, New Mexico, by a crew under the direction of Edgar Billings Howard from the Academy of Natural Sciences/University of Pennsylvania.[18] Howard's crew left their excavation in Burnet Cave, New Mexico (truly the first professionally excavated Clovis site) in August, 1932 and visited Whiteman and his Blackwater Draw site. In November, Howard was back at Blackwater Draw to investigate additional finds from a construction project.[18]

The American Journal of Archaeology (January–March, 1932 V36 #1) in its Archaeological Notes mentions E. B. Howard's work in Burnet Cave, including the discovery of extinct fauna and a "Folsom type" point four feet below a Basketmaker burial. This brief mention of the Clovis point found in place predates any work at the Dent Site in Colorado. Reference is made to a slightly earlier article on Burnet Cave in The University Museum Bulletin of November, 1931.

The first report of professional work at the Blackwater Draw Clovis site is in the November 25, 1932 issue of Science News. The publications on Burnet Cave and Blackwater Draw directly contradict statements by several authors (for example see Haynes 2002:56 The Early Settlement of North America) that Dent, Colorado was the first excavated Clovis site. The Dent Site, in Weld County, Colorado, was simply a fossil mammoth excavation in 1932. The first Dent Clovis point was found November 5, 1932 and the in situ point was found July 7, 1933. The in situ Clovis point from Burnet Cave was excavated in late August, 1931 (and reported early in 1932). E. B. Howard brought the Burnet Cave point to the 3rd Pecos Conference, September 1931, and showed it around to several archaeologists interested in Early Man (see Woodbury 1983).

Clovis First

Main article: Settlement of the Americas

Known as "Clovis First", the predominant hypothesis among archaeologists in the latter half of the 20th century had been that the people associated with the Clovis culture were the first inhabitants of the Americas. The primary support for this was that no solid evidence of pre-Clovis human inhabitation had been found. According to the standard accepted theory, the Clovis people crossed the Beringia land bridge over the Bering Strait from Siberia to Alaska during the period of lowered sea levels during the ice age, then made their way southward through an ice-free corridor east of the Rocky Mountains in present-day western Canada as the glaciers retreated. This hypothesis has been continuously challenged by studies that suggest a Pre-Clovis Human occupation of the Americas[20] until in 2011, following the discovery of pre-Clovis occupation site, a prominent group of scientists claimed to have definitely established the existence "of an occupation older than Clovis."[21][22]

Evidence of human habitation before Clovis

Archaeological sites that predate Clovis that are well documented include the following:

Predecessors of the Clovis people may have migrated south along the North American coastlines, although there are arguments for many migrations along several different routes.[43] According to researchers Michael Waters and Thomas Stafford of Texas A&M University, new radiocarbon dates place Clovis remains from the continental United States in a shorter time window (11,050 to 10,900 years ago),[44] while radiocarbon dating of the Monte Verde site in Chile place Clovis-like culture there as early as 13,500 years ago and remains found at the Channel Islands of California place coastal Paleoindians there 12,500 years ago. This suggests that the Paleoindian migration could have spread more quickly along the Pacific coastline, proceeding south, and that populations that settled along that route could have then begun migrations eastward into the continent.

The Pedra Furada sites in Brazil include a collection of rock shelters, used for thousands of years by diverse human populations. The first excavations yielded artifacts with C14 dates of 48,000 to 32,000 years BP. Repeated analysis has confirmed this dating, carrying the range of dates up to 60,000 BP.[45] The best analyzed archaeological levels are dated between 32,160 ± 1000 years BP and 17,000 ± 400 BP.

In 2004, worked stone tools were found at Topper in South Carolina that have been dated by radiocarbon techniques possibly to 50,000 years ago,[46] although there is significant dispute regarding these dates.[47] Evidence of humans at the Topper Site definitely date back to 22,900 cal yr BP.[48]

A more substantiated claim is that of Paisley Caves, where rigorous carbon-14 and genetic testing appears to indicate that humans related to modern Native Americans were present in the caves over 1000 14C years before the earliest evidence of Clovis. A study published in Science presents strong evidence that humans occupied sites in Monte Verde, at the tip of South America, as early as 13,000 years ago.[49] If this is true then humans must have entered North America long before the Clovis Culture – perhaps 16,000 years ago.

The Tlapacoya site is located along the base of a volcanic (remnant) hill on the shore of the former Lake Chalco. Seventeen excavations along the base of Tlapacoya hill between 1956 and 1973 uncovered piles of disarticulated bones of bear and deer that appeared to have been butchered, plus 2,500 flakes and blades presumably from the butchering activities, plus one non-fluted spear point. All were found in the same stratum containing three circular hearths filled with charcoal and ash. Bones of many other animal species were also present, including horses and migratory waterfowl. Two uncalibrated radiocarbon dates on carbon from the hearths came in at approximately 24,000 and 22,000 years ago.[50] At another location a prismatic micro-blade of obsidian was found in association with a tree trunk radiocarbon dated (uncalibrated) at approximately 24,000 years ago. This obsidian blade has recently been hydration dated by Joaquín García-Bárcena to 22,000 years ago and the hydration results published in a seminal article that deals with the evidence for pre-Clovis habitation of Mexico.[51]

Coastal migration route

Recent studies of the mitochondrial DNA of First Nations/Native Americans suggest that the people of the New World may have diverged genetically from Siberians as early as 20,000 years ago, far earlier than the standard theory suggests.[20] However, this pattern is not inconsistent with a later colonization from Siberia because gene coalescent theory predicts that genetic co-ancestry is expected to greatly predate colonization and/or isolation. According to one alternative theory, the Pacific coast of North America may have been free of ice, allowing the first peoples in North America to come down this route prior to the formation of the ice-free corridor in the continental interior. No solid evidence has yet been found to support this hypothesis except that genetic analysis of coastal marine life indicates diverse fauna persisting in refugia throughout the Pleistocene ice ages along the coasts of Alaska and British Columbia; these refugia include common food sources of coastal aboriginal peoples, suggesting that a migration along the coastline was feasible at the time.[52]

Solutrean hypothesis

Main article: Solutrean hypothesis

The controversial Solutrean hypothesis proposed in 1999 by Smithsonian archaeologist Dennis Stanford and colleague Bruce Bradley (Stanford and Bradley 2002), suggests that the Clovis people could have inherited technology from the Solutrean people who lived in southern Europe 21,000–15,000 years ago, and who created the first Stone Age artwork in present-day southern France.[53] The link is suggested by the similarity in technology between the projectile points of the Solutreans and those of the Clovis people. The model envisions these people making the crossing in small watercraft via the edge of the pack ice in the North Atlantic Ocean that then extended to the Atlantic coast of France, using skills similar to those of the modern Inuit people.

In a 2008 study of the relevant paleoceanographic data, Kieran Westley and Justin Dix concluded that "it is clear from the paleoceanographic and paleo-environmental data that the Last Glacial Maximum (LGM) North Atlantic does not fit the descriptions provided by the proponents of the Solutrean Atlantic Hypothesis. Although ice use and sea mammal hunting may have been important in other contexts, in this instance, the conditions militate against an ice-edge-following, maritime-adapted European population reaching the Americas."[54]

University of New Mexico anthropologist Lawrence G. Straus, a primary critic of the Solutrean hypothesis, points to the theoretical difficulty of the ocean crossing, a lack of Solutrean-specific features in pre-Clovis artifacts, as well as the lack of art (such as that found at Lascaux in France) among the Clovis people, as major deficiencies in the Solutrean hypothesis. The 3,000 to 5,000 radiocarbon year gap between the Solutrean period of France and Spain and the Clovis of the New World also makes such a connection problematic.[55] In response, Bradley and Stanford contend that it was "a very specific subset of the Solutrean who formed the parent group that adapted to a maritime environment and eventually made it across the north Atlantic ice-front to colonize the east coast of the Americas" and that this group may not have shared all Solutrean cultural traits.[56]

Genetic studies

Main article: Indigenous Amerindian genetics

Mitochondrial DNA analysis has found that some members of some native North American tribes have a maternal ancestry (called haplogroup X) linked to the maternal ancestors of some present day individuals in western Asia and Europe, albeit distantly, and has also provided some support for pre-clovis models.

Fagundes et al. in the American Journal of Human Genetics state in their abstract "Here we show, by using 86 complete mitochondrial genomes, that all Native American haplogroups, including haplogroup X, were part of a single founding population, thereby refuting multiple-migration models. A detailed demographic history of the mtDNA sequences estimated with a Bayesian coalescent method indicates a complex model for the peopling of the Americas, in which the initial differentiation from Asian populations ended with a moderate bottleneck in Beringia during the last glacial maximum (LGM), around ∼23,000 to ∼19,000 years ago. Toward the end of the LGM, a strong population expansion started ∼18,000 and finished ∼15,000 years ago. These results support a pre-Clovis occupation of the New World, suggesting a rapid settlement of the continent along a Pacific coastal route." [57]

Other sites

In approximate reverse chronological order:

See also

References

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  64. ^ Schafer from the website of the "Friends of the Ice Age" in Kenosha County, Wisconsin
  65. ^ Ancient Stone "Tools" Found; May Be Among Americas' Oldest from the National Geographic website
  66. ^ Michael Balter. "DNA from Fossil Feces breaks Clovis Barrier". Sciencemag.org. http://www.sciencemag.org/cgi/content/summary/320/5872/37. Retrieved 2011-03-27.
  67. ^ New Scientist 12/4/08 pg 15
  68. ^ Mud Lake Site from the website of the "Friends of the Ice Age" in Kenosha County, Wisconsin
  69. ^ "The Greatest Journey", James Shreeve, National Geographic, March 2006, pg. 64
  70. ^ Pre-Clovis Occupation on the Nottoway River in Virginia Pre-Clovis Occupation on the Nottoway River in Virginia from the website of the Athena Review, Vol.2, no.3
  71. ^ Lee, Mike (December 27, 1999). "Work on 1987 discovery on hold". Tri-City Herald (Kennewick, Washington: The McClatchy Company). OCLC 17157840. http://www.tri-cityherald.com/1999/12/27/136330/work-on-1987-discovery-on-hold.html. Retrieved {{subst:today}}.

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