22 August 2011

Negative halite molds from Belt argillite

Posted by Callan Bentley

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 quite as striking as the example I showed you last week, but I think in tandem with that other one, it will serve well to convey the idea of halite casts to my Historical Geology students.