= Solution
The <sandstone> records deposition of transported sand, followed by burial and cementation. For the Bunter setting, river channels, floodplains with channel sands and arid continental dune systems are plausible environments; a <sandstone> name alone does not uniquely distinguish them. Well-sorted or weakly cemented sand can retain the connected <porosity> and <porous permeability> needed for a <saline aquifer>.
The Zechstein <evaporite> suggests restricted marine basins or salinas in an arid climate, where evaporation concentrates seawater until dissolved salts precipitate. Repeated restriction and replenishment can build thick <evaporite> sequences, including rock salt. The Triassic <limestone> indicates carbonate accumulation, plausibly in warm, shallow marine settings with limited siliciclastic supply, followed by cementation. Some <limestones> can also form in lakes; the marine interpretation here uses the stated regional sequence.
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