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      Jake Bluff: Clovis Bison Hunting on the Southern Plains of North America

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      American Antiquity
      Society for American Archaeology

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          Abstract

          Clovis hunters of the North American Great Plains are known for their ability to hunt and scavenge mammoths. Less is known of their hunting strategies for other large animals, such as horse, camel, and bison, although remains of these animals have been found at several Clovis camps. Recent investigations of the Jake Bluff site on the southern Plains have identified a Clovis bison kill in an arroyo. The apparent use of an arroyo style trap for bison hunting provides the opportunity to study Clovis hunting strategies that came to be widely used during later Paleoindian times. The arroyo style bison trap is generally attributed to Folsom and later groups, and yet the Jake Bluff site yielded an association of Clovis-style projectile points with the remains of 22 Bison antiquus at the bottom of a short arroyo. The late date of 12,838 cal. BP suggests that the site spans the gap between the Clovis mammoth hunter and the Folsom bison hunter, indicating that some Clovis hunters developed the arroyo style bison trap to capture multiple bison at the same time, and as mammoths were extirpated from certain areas during the Pleistocene to Holocene transition.

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          Taphonomic and ecologic information from bone weathering

          Bones of recent mammals in the Amboseli Basin, southern Kenya, exhibit distinctive weathering characteristics that can be related to the time since death and to the local conditions of temperature, humidity and soil chemistry. A categorization of weathering characteristics into six stages, recognizable on descriptive criteria, provides a basis for investigation of weathering rates and processes. The time necessary to achieve each successive weathering stage has been calibrated using known-age carcasses. Most bones decompose beyond recognition in 10 to 15 yr. Bones of animals under 100 kg and juveniles appear to weather more rapidly than bones of large animals or adults. Small-scale rather than widespread environmental factors seem to have greatest influence on weathering characteristics and rates. Bone weathering is potentially valuable as evidence for the period of time represented in recent or fossil bone assemblages, including those on archeological sites, and may also be an important tool in censusing populations of animals in modern ecosystems.
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            Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling.

            A carbon-rich black layer, dating to approximately 12.9 ka, has been previously identified at approximately 50 Clovis-age sites across North America and appears contemporaneous with the abrupt onset of Younger Dryas (YD) cooling. The in situ bones of extinct Pleistocene megafauna, along with Clovis tool assemblages, occur below this black layer but not within or above it. Causes for the extinctions, YD cooling, and termination of Clovis culture have long been controversial. In this paper, we provide evidence for an extraterrestrial (ET) impact event at approximately equal 12.9 ka, which we hypothesize caused abrupt environmental changes that contributed to YD cooling, major ecological reorganization, broad-scale extinctions, and rapid human behavioral shifts at the end of the Clovis Period. Clovis-age sites in North American are overlain by a thin, discrete layer with varying peak abundances of (i) magnetic grains with iridium, (ii) magnetic microspherules, (iii) charcoal, (iv) soot, (v) carbon spherules, (vi) glass-like carbon containing nanodiamonds, and (vii) fullerenes with ET helium, all of which are evidence for an ET impact and associated biomass burning at approximately 12.9 ka. This layer also extends throughout at least 15 Carolina Bays, which are unique, elliptical depressions, oriented to the northwest across the Atlantic Coastal Plain. We propose that one or more large, low-density ET objects exploded over northern North America, partially destabilizing the Laurentide Ice Sheet and triggering YD cooling. The shock wave, thermal pulse, and event-related environmental effects (e.g., extensive biomass burning and food limitations) contributed to end-Pleistocene megafaunal extinctions and adaptive shifts among PaleoAmericans in North America.
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              Redefining the age of Clovis: implications for the peopling of the Americas.

              The Clovis complex is considered to be the oldest unequivocal evidence of humans in the Americas, dating between 11,500 and 10,900 radiocarbon years before the present (14C yr B.P.). Adjusted 14C dates and a reevaluation of the existing Clovis date record revise the Clovis time range to 11,050 to 10,800 14C yr B.P. In as few as 200 calendar years, Clovis technology originated and spread throughout North America. The revised age range for Clovis overlaps non-Clovis sites in North and South America. This and other evidence imply that humans already lived in the Americas before Clovis.
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                Author and article information

                Journal
                applab
                American Antiquity
                Am. antiq.
                Society for American Archaeology
                0002-7316
                2325-5064
                October 2010
                January 2017
                : 75
                : 04
                : 907-933
                Article
                10.7183/0002-7316.75.4.907
                565d20f4-ecf9-4b99-9d46-06515cb2dbba
                © 2010
                History

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