Fig. S2: Rapid changes from arid to humid conditions during the onset of the Paraná-Etendeka Igneous Provinces: can volcanic gas emissions from Continental Flood Basalts affect the precipitation regime?

Heterolithic sandstones and thin sandstones lenses/sheets. (a) Sample from a thin massive fine sandstone showing incipient parallel to low angle lamination (dashed white). (b), (c) Thin sections from heterolithic sandstones highlighting some of the variation in silt–mud content. Note the sand-dyke cutting through the lamination in (c) (black arrow). (d) Hand sample from a heterolithic sandstone associated with a basaltic breccia. Note the loss of lamination near the basaltic clast (red arrow), indicating that interaction with basaltic lava occurred after sediment deposition and involved some process of textural homogenization, like fluidization. All photomicrographs taken with parallel nichols.