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Phase I Study: Geophysical Investigation Survey Report – Las Animas Geophysical Study, Hollister to Gilroy 4 Lanes, California.
This survey was designed to employ geophysical techniques that included three technical approaches: grorn1d penetrating radar (GPR), total field magnetometry (MAG), and electromagnetic induction (EM). Only two of the geophysical tools were used, EM and GPR.Upon inspecting these locations, it was decided that MAG would not be effective because of thehigh metal content of the proposed survey area, and therefore it was not used. Geophysical mapping in the Las Animas study area has located possible historic features buried by as much as a meter of sediment and soil. GPR reflection profiles and timeslice maps showed the location of four possible…
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Integration of GPR and GIS to Model the Distribution of Pre-Columbian Canoes, Florida
The distribution of ancient dugout canoes, which were abandoned on waterways in Florida, were mapped with GPR and their locations studied using GIS. Canoes were located using GPR reflection profiles, which were compared to 2-D forward models for interpretation. Two lakes in northern Florida were found to contain many canoes, which were concentrated in distinct areas along the shore. These were likely transit points for transportation of goods and people from east to west across the Florida Peninsula over millennia. The State’s fluvial and lake navigation network was studied by determining possible transportation routes between canoe locations and contemporaneous archaeological…
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GPR on a High Mountain Lake, Colorado, USA
Many GPR reflection profiles were collected using a canoe on a freshwater lake in the Rocky Mountains. Excellent radar wave penetration was measured, using both 270 and 400 MHz antennas. Reflection traces were placed into space using GPS and individual profiles were interpreted, with the lake bottom and other reflections digitized for three-dimensional mapping. It was found that the lake was composed of more than six sub-basins, which were bounded by glacial moraines and large bedrock slump blocks. Each basin contained a different sediment package with a unique depositional history. One small basin was chosen for coring, and a buried…
