J. Grotzinger

1) El Capitan texture.  This image shows a close up of the rock
    nicknamed "El Capitan".  This is massive in the lower part but
    shows fine, parallel lamination in the upper part.  The rock
    contains scattered spheroids, and more abundant scattered vugs
    that have a disk-like geometry.  The spheroids are 1-2 mm in
    diameter, and the vugs are about 1 cm long.  Note that neither
    feature has any systematic relationship with respect to the
    lamination.  The vugs cross-cut bedding.