Sandstone:  sedimentary rock composed mostly of rounded or angular quartz grains that accumulate on beaches, floodplains, and rivers

Mudstone: very fine grained sedimentary rock composed mostly of quartz, mica, and clay minerals that accumulate in quiet-water environments such as shallow-marine waters, lagoons, floodplains, and lakes

Limestone: sedimentary rock composed of calcium carbonate formed in shallow seas

Dune sandstone: sedimentary rock composed primarily of quartz grains that accumulate in sand dune environments; has characteristic cross-beds (diagonal lines in photograph)