Fig. 3: Elemental distribution and concentration in Francevillian fossils.
From: A battle against arsenic toxicity by Earth’s earliest complex life forms
a The characteristic ratios of trace element content (ppm) in sedimentary and hydrothermal pyrite49 confirm the sedimentary formation of pyrite in all of the Gabonese specimens. b Comparative boxplot of LA-ICPMS analysis of trace element concentrations in pyrite from the tubular fossils, lobate fossils, and the abiotic concretions, showing trace element enrichment in fossils compared to the late diagenetic pyrite concretions. The median is represented by a line inside the box, which itself represents the interquartile range (IQR) (Q1, 25th percentile and Q3, 75th percentile). Whiskers extend to the minimum and maximum values within 1.5 IQR. Points are the outliers. Source data are provided as a Source Data file (Table S2).
