Site              lat        lon             Sampling_Date  Alvin_Dive  core  Sample_ID  methane_conc  methane_conc_stdev  d13C_CH4  d13C_CH4_stdev  
Cathedral Hill    27.01267   -111.40500      2018-11-17     4991        7     116-12     0.15          0.004               -34.61    0.39            
Cathedral Hill    27.01267   -111.40500      2018-11-20     4994        5     517-14     0.02          0.002               -26.04    0.08            
Cathedral Hill    27.01267   -111.40500      2018-11-17     4991        41    310-10     0.12          0.03                -37.23    0.13            
Cathedral Hill    27.01267   -111.40500      2018-11-25     5000        8     917-14     0.15          0.003               -32.77    0.08            
Aceto Balsamico   27.00783   -111.40712      2018-11-23     4998        20    710-10     0.06          0.005               -53.88    0.17            
Aceto Balsamico   27.00783   -111.40712      2018-11-23     4998        15    617-14     0.28          0.02                -38.95    0.20            
Aceto Balsamico   27.00783   -111.40712      2018-11-18     4992        24    4110-20    0.55          0.06                -52.30    0.70            
Cathedral Hill    27.01267   -111.40500      2018-11-25     5000        8     910-7      0.11          0.01                -31.85    0.07            
Aceto Balsamico   27.00783   -111.40712      2018-11-23     4998        15    610-7      0.18          0.01                -37.134   0.05            
Cathedral Hill    27.01267   -111.40500      2018-11-20     4994        5     510-7      0.01          0.0001              -30.64    0.08            
Cathedral Hill    27.01267   -111.40500      2018-11-17     4991        7     110-6      0.10          0.00                -34.64    0.19            
Aceto Balsamico   27.00783   -111.40712      2018-11-18     4992        24    410-10     0.05          0.01                -47.09    0.03            
Aceto Balsamico   27.00783   -111.40712      2018-11-23     4998        15    6114-21    0.25          0.02                -39.91    0.03            
Aceto Balsamico   27.00783   -111.40712      2018-11-23     4998        20    7110-20    0.17          0.02                -53.52    0.27            
Cathedral Hill    27.01267   -111.40500      2018-11-17     4991        41    3110-20    0.14          0.01                -37.16    0.39            
Cathedral Hill    27.01267   -111.40500      2018-11-17     4991        41    3120-30    0.04          0.004               -29.02    0.04            
Cathedral Hill    27.01267   -111.40500      2018-11-20     4994        5     5114-21    0.02          0.001               -24.54    0.17            
Aceto Balsamico   27.00783   -111.40712      2018-11-23     4998        20    7120-30    0.16          0.06                -52.39    0.12            
Cathedral Hill    27.01267   -111.40500      2018-11-17     4991        35    2110-20    0.004         0.00                -45.45    0.23            
Cathedral Hill    27.01267   -111.40500      2018-11-24     4999        8     8114-21    0.00          0.00                -64.39    1.24            
Cathedral Hill    27.01267   -111.40500      2018-11-17     4991        7     1112-18    0.08          0.002               -38.13    0.45            
Cathedral Hill    27.01267   -111.40500      2018-11-25     5000        8     9114-21    0.13          0.02                -33.53    0.08            
Cathedral Hill    27.01267   -111.40500      2018-11-24     4999        8     817-14     0.001         0.00                -63.88    3.88            
Cathedral Hill    27.01267   -111.40500      2018-11-24     4999        8     810-7      0.001         0.00                -70.15    1.41            
Cathedral Hill    27.01267   -111.40500      2018-11-17     4991        35    210-10     0.005         0.00                -46.30    0.02