I got to the library today and a bunch of interesting papers. This one seems to be quite up-to-date. The establishment is buying into pre-Clovis and a coastal migration. ;-).

T.G Schurr and S.T. Sherry. 2004. “Mitochondrial DNA and Y Chromosome Diversity and the Peopling of the Americas: Evolutionary and Demographic Evidence,” Am. J. of Human Biology 16: 420-439.

ABSTRACT: A number of important insight into the peopling of the New World have been gained through molecular studies of Siberian and native American populations. While there is no complete agreement on the interpretation of the mitochondrial DNA (mtDNA) and the Y chromosome (NRY) data from theses groups, several generalizations can be made. To begin with, the primary migration of ancestral Asians expanded from south-central Siberia into the New World and gave rise to the Amerindians. The initial migration seems to have occurred between 20,000-15,000 calendar years before present (cal BP), i.e. before the emergence of Clovis lithic sites (13,500-12,895 cal BP) in North America. Because an interior route through northern North America was unavailable for human passage until 12,550 cal BP, after the last glacial maximum (LMG), these ancestral groups must have used a coastal route to reach south America by 14,675 cal BP, the date of the Monte Verde site in southern Chile. The initial migration appears to have brought mtDNA haplogroups A-D and NRY haplogroups P-M45a and Q-242/Q-M3 to the New World, with these genetic lineages becoming widespread in the Americas. A second expansion that perhaps coincided with the opening of the ice-free corridor probably brought mtDNA haplogroup X and NRY haplogroups P-M45b, C-M130, and R1a1-M17 to North and Central America. Finally populations that formerly inhabited Beringia expanded into northern North America after the LGM and gave rise to the Eskimo-Aleuts and Na-Dene Indians. [BOM These NRY haplotypes account for 95% of the NRY haplotypes in the New world]

C-M130 haplotypes only found in Na-Dene speaking Tanoan, Navajo, and Chipewayan and Amerindian Cheyenne. R1a1-M17 haplotypes only seen in Guam (Ngobe) a Chibchan-speaking tribe from Costa Rica. Neither of these haplogroups has been detected in South American Indian populations.

Bernard