Table 1 Summary of phosphorus data for Neoproterozoic iron formations and shales.

From: A phosphate-rich marine reservoir in the redox stratified Ediacaran ocean

Age

Mean

Sd

median

IQR

P/Fe(100) ratios of iron formations

Ediacaran (635–541 Ma, n = 40)

2.70

2.14

1.89

2.02

Cryogenian (717–635 Ma, n = 144)

1.17

1.24

0.79

1.28

Tonian (1000–717 Ma, n = 14)

0.27

0.25

0.16

0.27

P concentrations of shales

Ediacaran (635–541 Ma, n = 440)

0.34

1.78

0.03

0.05

Cryogenian (717–635 Ma, n = 245)

0.09

0.10

0.08

0.07

Tonian (1000–717 Ma, n = 628)

0.13

0.54

0.04

0.06

  1. IQR expresses the interquartile range. [P/Fe(100) = [mol P]/[mol Fe] × 100]. See Supplementary Tables 2 and 3 for data sources.
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