Upon the rover’s arrival at Bright Angel, it was so exciting to see all the interesting features in the rocks of this interval! In particular, these rocks contain an abundance of veins and nodules. Veins are linear features containing mineral crystals that often form thin plates or sheets that cut through the rocks and across other veins. Veins are often more resistant to erosion than the rocks they are found in so they stand out in raised relief. Nodules are small, rounded protrusions in the rocks. Nodules are often sites of mineral formation distinct from the surrounding rock.