Paleomagnetic dating accuracy

Paleomagnetic directions: Natural Remanent Magnetization (NRM) was measured on oriented samples using a 90-Hz spinner magnetometer with a sensitivity better than 10-5 A/m.Samples were demagnetized in steps through alternating-field (AF) demagnetization with peak fields of 5, 10, 15, 20, 30, 40, 60 and 80 milli Teslas (m T).

Sampling: Samples used for paleomagnetic directions, magnetic susceptibility, and laboratory induced magnetizations were taken approximately every 5 cm.Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site.Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating.Laboratory induced magnetization: Magnetizations were measured with a high speed spinner magnetometer.ARM was imparted in a decreasing AF from a peak induction of 100 m T and a DC bias of 0.1 m T.

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Consequently the application of these methods to geologic problems is best handled by the geologist who is familiar with both the geologic history of a suite of rocks and the physical basis and assumptions of the dating or correlation techniques. PHYSICAL BASIS OP THE PALEOMAGNETIC METHOD The paleomagnetic correlation of rocks is based on two independent physical phenomena.

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