Fig. 2

Spatial distribution of Cl⁻ in pore-waters from Mont Terri and Mont Russelin. “Orthogonal distance” refers to distance from the top of Opalinus Clay in the direction normal to bedding. Numbers indicate total diffusion times in Myr. Data from Pearson et al. (2003) and Koroleva et al. (2011), model fits from Mazurek et al. (2011) and Koroleva et al. (2011). References for water samples taken in situ see Table 1. Aquifers are shown in grey