ANTH 9 Lecture Notes - Lecture 12: Global Positioning System, Ground-Penetrating Radar, Magnetometer
3 Sep 2020
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Shovel testing: excavation of a 40x40cm unit to 35 50cm. Shovel testing generally useful for shallow deposits. Shovel testing on a gird system at specified intervals (e. g. 10 meters) to define site boundaries and relative densities. Magnetometer: detects variation in the intensity (not direction) of the magnetic signal. Materials vary in the strength of the magnetic signal. Stones, humus, hearths may be stronger than the soil. (hidatsa village house, north dakota) Resistivity: ability of a matrix to conduct an electrical current. High moisture soil facilitate conductivity, rocks prevent it. Ground penetrating radar: uses radar pulses to image the subsurface. This non-destructive method uses electromagnetic radiation and detects the reflected signal form subsurface structures. The data needed to locate and register a site include: Site boundaries defined on the basis of artifact distributions from shovel test pits or surface collection. A site registration form through the state. A site number (e. g. 44he0077: state, county, #seq.
