A. Speleological map of the Banquier Cave adapted from Aussenac et al. (2022). The galleries analysed by the authors are highlighted in red on the inset map. Corridor galleries are mainly oriented N-S, and tube galleries intersect corridors. Several indicators of stratiform dissolution are identified throughout the Western gallery. B. Corridor galleries are tens of m high, with collapsed blocks on the floor and ceiling. The stratification plane is consistent across the gallery. C. Tube galleries are m-sized, and walls are marked by multiple scallops indicating a westward water flow. D. Inter-strata / stratiform dissolution is expressed by irregular walls resulting from differential dissolution, with clay-rich strata still in positive relief. E and F. Unaltered host-rock with strata lamination intersected by calcite veins transitioning into a soft rock featuring consistent lamination and calcite veins. Pocket-knife thrust into the ghost-rock residual alterite for scale. (B to D photos credit to J. Y. Bigot)