Supplemental Material for : Pre-Columbian Lead Pollution from Native American Galena Processing and Land Use in the Midcontinental United States 1
semanticscholar(2019)
Abstract
Sample collection Four continuous, 10-meter-long sediment cores were collected from two locations at Avery in June 2014 using a modified Livingstone piston corer driven by an electric winch coring tower system mounted on a floating raft (Wright et al., 1984). One-meter-long overlapping Livingstone cores were offset by 50 cm at each location to ensure complete recovery. Onemeter-long surface cores capturing the sediment-water interface were additionally collected at each of the Livingstone core locations using a modified piston corer. Cores were stored at 4 ̊C at the Indiana University-Purdue University, Indianapolis (IUPUI) Paleoclimatology and Sedimentology Laboratory prior to analysis. A composite sediment core measuring 995 cm was constructed by matching distinct stratigraphic units and sedimentological measurements (magnetic susceptibility, total organic matter, and geochemistry from X-ray fluorescence) from the A-14 coring location. The composite core penetrated to 10.0 m depth, but the lowest 5 cm were lost during the coring process because they were composed of coarse sand and gravel, which is difficult to retain with a modified Livingstone corer. Similarities in the physical and visual properties of cores from the two locations (magnetic susceptibility, stratigraphy) indicate consistent depositional patterns at both sites. Therefore, the A-14 composite core was chosen for detailed analysis since it was closest to the Kincaid Archaeological site.
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