Spatial gradients in Clovis-age radiocarbon dates across North America suggest rapid colonization from the north.

Spatial gradients in Clovis-age radiocarbon dates across North America suggest rapid colonization from the north. Research Abstract Details 

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Spatial gradients in Clovis-age radiocarbon dates across North America suggest rapid colonization from the north. Abstract Text:

Marcus J Hamilton,Briggs Buchanan,

A key issue in the debate over the initial colonization of North America is whether there are spatial gradients in the distribution of the Clovis-age occupations across the continent. Such gradients would help indicate the timing, speed, and direction of the colonization process. In their recent reanalysis of Clovis-age radiocarbon dates, Waters and Stafford [Waters MR, Stafford TW, Jr (2007) Science 315:1122-1126] report that they find no spatial patterning. Furthermore, they suggest that the brevity of the Clovis time period indicates that the Clovis culture represents the diffusion of a technology across a preexisting pre-Clovis population rather than a population expansion. In this article, we focus on two questions. First, we ask whether there is spatial patterning to the timing of Clovis-age occupations and, second, whether the observed speed of colonization is consistent with demic processes. With time-delayed wave-of-advance models, we use the radiocarbon record to test several alternative colonization hypotheses. We find clear spatial gradients in the distribution of these dates across North America, which indicate a rapid wave of advance originating from the north. We show that the high velocity of this wave can be accounted for by a combination of demographic processes, habitat preferences, and mobility biases across complex landscapes. Our results suggest that the Clovis-age archaeological record represents a rapid demic colonization event originating from the north.

Spatial gradients in Clovis-age radiocarbon dates across North America suggest rapid colonization from the north. Publishing Authors By Initials

MJ Hamilton,B Buchanan,

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Spatial gradients in Clovis-age radiocarbon dates across North America suggest rapid colonization from the north. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Proceedings of the National Academy of Sciences of

VOLUME: 104

Page Numbers: 15625-30

Journal Abbreviation: Proc. Natl. Acad. Sci. U.S.A.

ISSN: 0027-8424

DAY: 26

MONTH: 09

YEAR: 2007

Spatial gradients in Clovis-age radiocarbon dates across North America suggest rapid colonization from the north. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Spatial gradients in Clovis-age radiocarbon dates across North America suggest rapid colonization from the north.

AFFILIATION: Department of Anthropology, University of New Mexico, Albuquerque, NM 87131, USA. marcusj@unm.edu

Country: United States

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MEDLINETA: Proc Natl Acad Sci U S A

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