Large basalt rock with plagioclase feldspar laths. Salt dried out and been forced up from below, forming brown chaotic structures. These were eroded by the wind so had groves in them. White salt was left on and in between the surfaces of these rocks. 990306 - Lumpy Riverbed Sand with Dimples Partly cloudy cirrus.
Sand looks moist and like it was part of a riverbed.
Curiously, it contains dimples.