Sedimentary facies and stacking patterns of fluvio‐deltaic and ‐estuarine deposits from the Palaeoarchean Moodies Group in the Stolzburg Syncline (Barberton Greenstone Belt, South Africa)

A new analysis of the Palaeoarchean Moodies Group in South Africa's Barberton Makhonjwa Mountains reveals a dynamic transition from river-dominated deltaic to estuarine environments, driven by changes in basin subsidence and sediment supply. The study, based on a 490-meter drillcore, identified distinct sedimentary facies and stacking patterns that indicate two superimposed transgressive-regressive cycles, suggesting early Earth's fluvial-marine systems were highly responsive to external forcings. This finding challenges traditional views of Archean sedimentary dynamics and provides critical insights into palaeoenvironmental conditions over 3 billion years ago.

Mukhopadhyay, S., Schreiber, D., Wichern, N., De Vleeschouwer, D., Heubeck, C., & Gugliotta, M. (2026). Sedimentary facies and stacking patterns of fluvio‐deltaic and ‐estuarine deposits from the Palaeoarchean Moodies Group in the Stolzburg Syncline (Barberton Greenstone Belt, South Africa). The Depositional Record, 12(4). Portico. https://doi.org/10.1002/dep2.70085