Fig. 1: Spatial and temporal distribution of banded iron formation. | Nature Communications

Fig. 1: Spatial and temporal distribution of banded iron formation.

From: Orbital forcing of ice sheets during snowball Earth

Fig. 1

a Palaeogeographic reconstruction ca. 700 Myr ago (updated from ref. 44) showing the locations of Cryogenian banded iron formation9 (BIF), and hypothesized cryoconite pans (gray) where cyanobacteria and eukaryotes may have taken refuge during snowball glaciation12. b Lithologic map of the two study locations at Oraparinna and Holowilena, South Australia (updated from ref. 21). c Simplified lithostratigraphy of the Sturtian glaciation in the Flinders Ranges, South Australia. d Fine-scale rhythmic banding observed in the Holowilena Ironstone at Holowilena.

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