| Sedimentary conditions
Indicator | Oxic | Suboxic | Anoxic | Euxinic |
| H2S | No free H2S in the water column | Free H2S present in the water column | ||
| O2 concentration in bottom waters [9] (mLO2/LH2O) | O2 > 2 | 0.2 < O2 < 2 | O2 < 0.2 | O2 = 0, [H2S] > 11 μm |
| δU [43] [44] | <1 | <1 | / | |
| V/Cr [55] | <2 | 2 - 4.25 | >4.25 | |
| Ni/Co [55] | <5 | 5 - 7 | >7 | / |