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22 August 2011
Negative halite molds from Belt argillite
As a follow up to last week’s post about halite casts in a hand sample I collected in western Montana’s Belt Supergroup, here’s another example. Unlike those (larger) examples of halite-shaped mud cubes, this sample shows (smaller) examples of the empty space left behind by the dissolved salt crystals: Image is scanned, and the penny is to provide a sense of scale. Here we go closer up, and annotated: Not …