Geo 365: Dec. 4, Day 338: Sheared Mudstone and Calcite

Though I've not really mentioned it much, if at all, secondary calcite is present in abundance in this outcrop, forming especially in joints which then break open and reveal the patches. Above the hammer is another example, where it's forming a flattened plate within the sheared mudstone. Above and below the mudstone are coarser, sandy layers.

Photo unmodified. May 7, 2013. FlashEarth location.