Selected examples of petrography of flowstone from palaeokarst deposits at Riversleigh. Compare with Fig. 5a-d. PP denotes plane polarized light, XP denotes cross-polarised light, scale bars = 1 mm. a/b) Flowstone showing syntaxial crystal palisades and terminal surface (white arrow). Growth direction is to the top left (QMD 19969, PP/XP, RSO Site. c/d) Fine flowstone showing thin palisade layer (white arrow). Growth direction is to the top left (QMD 19970, PP/XP WW Site).