Antiquity of man in America indicated by radiometric dates on the Yuha burial site

Six Decades of Radiocarbon Dating in New World Archaeology

“…Now essentially a historical footnote in the history of New World archaeological studies were a number of 14 C age determinations obtained in the early 1970s on human skeletal materials and the initial results of the application of 2 other dating methods-amino acid racemization (AAR) and uranium series (U-series)-to human skeletal samples that appeared to support a pre-Clovis occupation of the New World. In addition to the 14 C-based ages on the Los Angeles (Baldwin Hills) [>23,000 BP, UCLA-1430] and Laguna [17,150 ± 1470 BP (skull), UCLA-1233A and >14,800 BP, UCLA-1233B (long bone)] human skeletons (Berger et al 1971;Berger 1992), AAR-based age estimates assigned ages of 70,000 yr to the Sunnyvale (northern California) skeleton, >50,000 to the Haverty or Angeles Mesa skeleton (southern California), 48,000 yr to the Del Mar skeleton (southern California) and, apparently confirming an earlier 14 C value, 23,000 yr for the Yuha skeleton (southeastern California), although U-series-based determinations indicated an age of about 19,000 yr (Bada et al 1974;Bada and Helfman 1975;Bischoff et al 1976;Bischoff and Childers 1979).…”

Comments on the Pleistocene Age Assignment and Associations of a Human Burial from the Yuha Desert, California: A Rebuttal

“…The second objection concerns the radiometric dating of the IIC2ca carbonate horizon. Payen et al correctly point out that contamination is a serious problem in dating soil carbonates, a point admitted in Bischoff et al (1976). However, contamination if present is usually heterogenous on a small scale, and analyses of several samples from a given locality will give widely varying results.…”

Ridge-Back Tools of the Colorado Desert

“…Carbon 14 tests 24,000+2,000-1,000 B.P. (Childers 1974; made on caliche collected from 300 m elevation Bischoff and others 1976). The results of these near the mountains dated to 30,000 years B.P.…”