Table 2.
Criteria defining the different redox conditions.
| Redox condition | Dissolved oxygen (mL/L) | Gammacerane/C30hopane (%) | C35homohopane index | Pr/Ph | MoEF | UEF | VEF | Framboid pyrite size |
|---|---|---|---|---|---|---|---|---|
| Euxinic | 0 and presence of HS− | >10 | >6 | <1.3 | >80 | >6 | >2 | <5 μm |
| Anoxic | 0 | >3 | >3 | <1.3 | <80 | <6 | <2 | 5-6 μm? |
| Suboxic | 0–0.1 | <3 | <3 | <1.3 | <80 | <6 | <2 | 5-6 μm? |
| Dysoxic | 0.1–1.0 | <3 | <3 | 1.3-1.7* | <80 | <6 | <2 | 6-12 μm to no framboids? |
| Oxic | >1.0 | <3 | <3 | >1.7* | <80 | <6 | <2 | no framboids |
*
DBF/Phe must be <0.1. Framboid pyrite size after Wilkin et al. (1996) and Wignall et al. (2010). Distinguishing among anoxic-suboxic, dysoxic, and oxic was difficult using framboid pyrite size; we could only classify conditions as euxinic or non-euxinic.