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Table 4 The standard divisions based on trace element ratios for categorizing redox conditions

From: Bioturbation of Thalassinoides from the Lower Cambrian Zhushadong Formation of Dengfeng area, Henan Province, North China

Parameters

Anoxic

Oxic

Sources

Anoxic

Suboxic

Oxygen (ml/l)

0–0.2

0.2–2

>2

Tyson and Pearson (1991)

V/Cr

>4.25

2–4.25

<2

Kimura and Watanabe (2001)

Ni/Co

>7

5–7

<5

Jones and Manning (1994)

V/Sc

>9.1

<9.1

Murry et al. (1991)