Some of the dark sandstone in an area being explored by NASA’s Curiosity Mars rover shows texture and inclined bedding structures characteristic of deposits that formed as sand dunes, then were ...

SD sandstone dyke, Gy and clay gypsum nodule. Scale bar is 0.5 m. C) Pure gypsum veins (some with orange coloration) in gray mudstone member of Watchet Triassic mudstone. Scale bar is 0.25 m.

The shallow soil rock outcrop plant Talinum teretifolium Pursh (Portulacaceae) occurs on granite, sandstone, and serpentine outcrops and T mengesii Wolf occurs on granite and sandstone. Neither ...