Furthermore, as the density of the data which define the archeomagnetic reference curve varies in time, we suggest that one computes the mean directions with moving windows of varying duration, where both the window widths and the time shifts between successive mean directions are fixed when a minimum threshold density of data is reached within each time interval.
In our paper, we apply this new procedure to the French archeomagnetic data set.
Radiocarbon, or Carbon-14, dating is one of the most widely used absolute dating methods.
It has become an indispensable part of the archaeologist’s tool kit.
In 1982 Nelson was at the University of New Mexico, Albuquerque and in the early 1990s at the State University of New York, Buffalo, and Hegmon was at New Mexico State University, Las Cruces.
In 1995 both moved to Arizona State University, where they and the project reside today.
Secular variation (SV) of the Earth’s magnetic field can be used for dating purposes by comparing archeomagnetic directions of unknown ages with a well-dated reference curve. 103 (1990) 725] for testing the hypothesis that two Fisherian distributions of individual directions share a common mean direction.
The Eastern Mimbres Archaeological Project (EMAP), co-directed by Drs.
When the fire pit cools the iron particles in the hardened clay hold their position.
Each time the fire pit is reheated, the magnetization is reset.
By tracking and cross-dating past changes in the location of the magnetic field, geophysicists have reconstructed a series of magnetic polar positions extending back more than 2,000 years. At archaeological sites, hearths constructed of iron-bearing clays are ideal for archaeolomagnetic sampling because they were subjected to repeated hot firings.
This series of dated positions is known as the "archaeomagnetic reference curve." (Stacey Lengyel, 2010.
Earlier work by EMAP focused on the post-AD 1150 period, specifically what is now called the Reorganization phase [1150-early 1200s] of the Postclassic period.