cruise_id    lat_approx  lon_approx  core_id       sediment_depth  oxygen    comment                       
AT26-24      9.09        -87.10      4780-PC-20    0.5             0.0       nd                            
AT26-24      9.09        -87.10      4780-PC-20    1.5             0.7       nd                            
AT26-24      9.09        -87.10      4780-PC-20    2.5             0.7       nd                            
AT26-24      9.09        -87.10      4780-PC-20    3.5             1.1       5cm brown layer               
AT26-24      9.09        -87.10      4780-PC-20    12.5            1.1       olive grey below              
AT26-24      9.09        -87.10      4780-PC-20    23.5            0.4       nd                            
AT26-24      9.09        -87.10      4780-PC-20    24.5            0.7       nd