Photo credit: Brian Solomon / @waterfall_hillbilly Photo credit: Bryan Melton Sandstone boxwork is a unusual phenomenon that we see on the margins of the Cumberland Plateau. There are three things that must happen first to produce boxwork. Jointing Mineralization Weathering Jointing Produced in a parent rock of sandstone, this type of boxwork originates as small joints which run in a box shape. The origins of these joints could be from frost wedging - where water in the rock freezes and cracks the rock, or it could unloading pressure from the rock de-watering, or it could be from some other physical process. The origins of the boxwork joints are still a bit of a mystery. If the following steps occur without previous jointing then one gets Liesegang Rings. Mineralization The joints become a place of preferential mineralization. Groundwater loaded with iron minerals moves through the pores of the sandstone. Where it finds a void, like...
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