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Puebloan people used clay to create their fire pits.Each time the fire reached a certain temperature the iron particles are released to point to the position of the magnetic north at that time.When the organism dies, the ratio of C-14 within its body begins to gradually decrease. 900 and a corn cob was charred in the fire, the date that corn plant stopped living (i.e., when it was harvested) can be used to date the site. Because trees are perennials, their wood cannot provide an accurate radiocarbon date but may be used for tree-ring dating.The rate of decrease is 1/2 the quantity at death every 5,730 years. Comparing the amount of C-14 in a dead organism to available levels in the atmosphere produces an estimate of when that organism died. Radiocarbon dates provide a statistical range instead of an absolute year (eg., A. 950 ± 20 years), meaning that the plant died sometime between A. The earth’s north magnetic pole moves back and forth over time due to magnetic changes in the earth’s core.Therefore, archaeomagnetic dating is used to date the last time the fire pit was heated.Archaeologists collect archaeomagnetic samples by isolating a small pedestal of baked clay from the fire pit using a saw or dental tool.A non-magnetic, cube-shaped aluminum mold is placed over the sample and filled with plaster.

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.

81–3090.) So how do scientists use the earth's wandering magnetic field to date archaeological sites? Certain clays have a naturally high iron (Fe) content.

An absolute dating method based on the earth's shifting magnetic poles.