CLST 129 Lecture Notes - Lecture 11: Magnetometer
6 Sep 2016
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*the results of a magnetometry can be affected by iron objects, fences, overhead powerlines, etc. Measures the resistance of the soil to electricity by passing a current through the soil. Higher presence of water offer less resistance to an electric current. Built structures, which are more dense and contain less humidity, offer higher resistance. The fill of dug features (trenches, ditches, pits) offer lower resistance because it contains more moisture. A problem: can"t scan deep, only get metal items, can"t create maps, not a good as other methods. A potential resource: helps you identify more coins in an excavation that could possibly be missed. Evidence of contemporary activities are found horizontally through space, and changes through time are found vertically in sequences. Established by the 1830s, they apply especially to strata of solid rock. Law of superposition: when strata were originally formed, each was younger than the one beneath and older than the one above.
