North American Archaeomagnetism
U.S. Southwest Curve Expansion
Bolivian Curve Building Efforts
In 2002, Lengyel and Eighmy released a revised version of the US Southwest master curve SWCV595 - SWCV2000. The revised curve took
into account the amplitudinal dampening tendencies of the statistics used to produce the smoothed curve (via the moving windows approach).
Currently, these researchers are working to expand this curve to earlier times (pre-AD 600), and to strengthen the later segment
by including more historical data. They are also working to strengthen the AD 900-1050 segment, which is considered to be one of the
weakest sections of the existing curve. Researchers who are in a position to contribute to this effort are encouraged to contact the
lab to discuss collaboration. We are particularly interested in obtaining samples from features that have been independently-dated
to the AD 900-1050 or pre-AD 600 time periods. The strengthened and expanded curve will benefit all Southwest researchers by producing
more precise date ranges for the existing curve (by reducing the tendency for samples to date to the weaker AD 900-1050 segment),
and by increasing the temporal coverage of the curve.
Eighmy and Lengyel are collaborating with CSU archaeologist Dr. Mary Van Buren to develop an archaeomagnetic dating curve for the
Bolivian Andes. Current efforts are focused on the protohistoric and historical time periods (ca. AD 500 to present), although it
is hoped that this curve will be expanded to cover prehistoric time periods through new data. Results of this project were reported
at the 2006 Archaeological Sciences of the Americas Symposium at the University of Arizona, and they will appear in an upcoming article.