Supplement to Thiry & Milnes (2025) at https://doi.org/10.1017/qua.2025.6

<i>A model for groundwater silicification within the Sables de Fontainebleau in sub-contemporary landscapes in the Paris Basin </i><i>links the various distinctive morphologies of silicified sandstone bodies to the flow paths of groundwaters </i><i>that imported the silica, the conditions under which it was precipitated, and the patterns of iced ground. The silicified masses are, in </i><i>a way, fossil groundwater flow paths.</i>