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Accelerator Radiocarbon Dates on Charcoal, Shell, and Human Bone from the Del Mar Site, California

Published online by Cambridge University Press:  20 January 2017

Thomas W. Stafford Jr.
Affiliation:
Geophysical Laboratory, Carnegie Institution of Washington, 2801 Upton St. N.W., Washington, DC 20008, Center for Analytical Chemistry, National Bureau of Standards, Gaithersburg, MD 20899, and Department of Anthropology, University of New Mexico, Albuquerque, NM 87131
Rose A. Tyson
Affiliation:
San Diego Museum of Man, 1350 El Prado, Balboa Park, San Diego, CA 92101

Abstract

Accelerator radiocarbon dates on shell, charcoal, and human bone samples are an indication that human activity at the Del Mar site dates to 5000 B.P. and possibly from 7000 B.P. The shell and charcoal fragments were dislocated stratigraphically by extensive bioturbation and provide evidence that accelerator dates on extremely small samples should be used with caution. Certain depositional environments will require multiple dating within a site because single-sample dating will not yield definitive ages. Dating of individual amino acids from the Del Mar sphenoid yielded an average age of 4900 ± 40 B.P. and conclusively establishes the age for the Del Mar skull. The previously dated tibia was found to be contaminated with exogenous amino acids, thereby making its age uncertain.

Type
Reports
Copyright
Copyright © Society for American Archaeology 1989

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References

Reference Cited

Bada, J. L., Gillespie, R., Gowlett, J. A. J., and Hedges, R. E. M. 1984 Accelerator Mass Spectrometry Radiocarbon Ages of Amino Acid Extracts from Californian Palaeoindian Skeletons. Nature 312 : 442444.CrossRefGoogle ScholarPubMed
Bada, J. L., and Helfman, P. M. 1975 Amino Acid Racemization Dating of Fossil Bones. World Archaeology 7 : 160173.CrossRefGoogle ScholarPubMed
Bada, J. L., Schroeder, R. A., and Carter, G. F. 1974 New Evidence for the Antiquity of Man in North America Deduced from Aspartic Acid Racemization. Science 184 : 791793.CrossRefGoogle ScholarPubMed
Bischoff, J. L., and Rosenbauer, R. J. 1981 Uranium Series Dating of Human Skeletal Remains from the Del Mar and Sunnyvale Sites, California. Science 213 : 10031005.CrossRefGoogle Scholar
Bond, S. I. 1977 An Annotated List of the Mammals of San Diego County, California. San Diego Society of Natural History Transactions 18 : 229247.CrossRefGoogle Scholar
Gowlett, J. A. J., Hedges, R. E. M., Law, I. A., and Perry, C. 1987 Radiocarbon Dates from the Oxford AMS System : Archaeometry Datelist 5. Archaeometry 29 : 125155.CrossRefGoogle Scholar
Hedges, R. E. M., and Gowlett, J. A. J. 1986 Radiocarbon Dating by Accelerator Mass Spectrometry. Scientific American 254 : 100107.CrossRefGoogle Scholar
Jull, A. J. T., Donahue, D. J., and Zabel, T. H. 1983 Target Preparation for Radiocarbon Dating by Tandem Accelerator Mass Spectrometry. Nuclear Instruments and Methods in Physics Research 218 : 509514.CrossRefGoogle Scholar
Linick, T. W. 1977 La Jolla Natural Radiocarbon Measurements VII. Radiocarbon 19 : 1948.CrossRefGoogle Scholar
Linick, T. W. 1979 La Jolla Natural Radiocarbon Measurements. Radiocarbon 21 : 186202.CrossRefGoogle Scholar
Linick, T. W., Jull, A. J. T., Toolin, L. J., and Donahue, D. 1986 Operation of the NSF-Arizona Accelerator Facility for Radioisotope Analysis and Results from Selected Collaborative Research Projects. Radiocarbon 28 : 522533.CrossRefGoogle Scholar
Mac Clintock, D. 1970 Squirrels of North America. California Academy of Sciences, Van Nostrand Reinhold, New York.Google Scholar
Masters, P. M., and Bada, J. L. 1977 Racemization of Isoleucine in Fossil Molluscs from Indian Middens and Interglacial Terraces in Southern California. Earth and Planetary Science Letters 37 : 173183.CrossRefGoogle Scholar
Robinson, S. W., and Trimble, D. A. 1981 US Geological Survey, Menlo Park, California, Radiocarbon Measurements II. Radiocarbon 23 : 305321.CrossRefGoogle Scholar
Rogers, S. L. 1974 An Ancient Human Skeleton Found at Del Mar, California. San Diego Museum Papers No. 7. Museum of Man, San Diego, California.Google Scholar
Slota, P. J., Jull, A. J. T., Linick, T. W., and Toolin, L. J. 1987 Preparation of Small Samples for 14C Accelerator Targets by Catalytic Reduction of CO. Radiocarbon 29 : 303306.CrossRefGoogle Scholar
Stafford, T. W. Jr., Jull, A. J. T., Brendel, K., Duhamel, R. C., and Donahue, D. 1987 Study of Bone Radiocarbon Dating Accuracy at the University of Arizona NSF Accelerator Facility for Radioisotope Analysis. Radiocarbon 29 : 2444.CrossRefGoogle Scholar
Stafford, T. W. Jr., Brendel, K., and Duhamel, R. C. 1988 Radiocarbon, 13C and 15N Analysis of Fossil Bone : Removal of Humates with XAD-2 Resin. Geochimica et Cosmochimica Acta 52 : 22572267.CrossRefGoogle Scholar
Verkouteren, R. M., Klouda, G. A., Currie, L. A., Donahue, D. J., Jull, A. J. T., and Linick, T. W. 1987 Preparation of Microgram Samples on Iron Wool for Radiocarbon Analysis Via Accelerator Mass Spectrometry : A Closed System Approach. Nuclear Instruments and Methods B29 : 4144.CrossRefGoogle Scholar
Wehmiller, J. F. 1977 Amino Acid Studies of the Del Mar, California, Midden Site : Apparent Rate Constants, Ground Temperature Models, and Chronological Implications. Earth and Planetary Science Letters 37 : 184-196.CrossRefGoogle Scholar