Table 7 Calculated index results based on biomarker parameters of the analyzed stromatolites

CPI_25–31

0.5 × [(n-C₂₅ + n-C₂₇ + n-C₂₉ + n-C₃₁)/(n-C₂₄ + n-C₂₆ + n-C₂₈ + n-C₃₀) + (n-C₂₅ + n-C₂₇ + n-C₂₉ + n-C₃₁)/(n-C₂₆ + n-C₂₈ + n-C₃₀ + n-C₃₂)]

ACL_27–33

(27 × n-C₂₇ + 29 × n-C₂₉ + 31 × n-C₃₁ + 33 × n-C₃₃)/(n-C₂₇ + n-C₂₉ + n-C₃₁ + n-C₃₃)

Norm31

n-C₃₁/(n-C₂₉ + n-C₃₁)

Norm33

n-C₃₃/(n-C₂₉ + n-C₃₃)

Paq

(C₂₃ + C₂₅)/(C₂₃ + C₂₅ + C₂₉ + C₃₁)