core lat lon depth core_sample actual_depth sulfate_mM P13 27.20745 -111.22955 1859 1 -2 28.67 P13 27.20745 -111.22955 1859 2 5 28.29 P13 27.20745 -111.22955 1859 3 16 28.35 P13 27.20745 -111.22955 1859 4 36 28.05 P13 27.20745 -111.22955 1859 5 61 27.52 P13 27.20745 -111.22955 1859 6 86 27.58 P13 27.20745 -111.22955 1859 7 111 7.56 P13 27.20745 -111.22955 1859 8 135.5 27.82 P13 27.20745 -111.22955 1859 9 160.5 27.52 P13 27.20745 -111.22955 1859 10 185.5 27.28 P13 27.20745 -111.22955 1859 11 210.5 27.03 P13 27.20745 -111.22955 1859 12 235.5 27.12 P13 27.20745 -111.22955 1859 13 260.5 27.03 P13 27.20745 -111.22955 1859 14 285.5 27.1 P13 27.20745 -111.22955 1859 15 310.5 27.02 P13 27.20745 -111.22955 1859 16 339 27.17