Sandstone deposits in shallow waters were shaped by waves, creating layers that span continents and hint at ancient arid climates. [1] Red sandstone suggests arid conditions, as seen in the widespread deposits across continents during the Devonian period. [2]
Ancient sandstone and conglomerate formations are the sedimentary accumulations of primitive marine life when continental shores sank beneath the seas during the early appearance of the world-wide ocean. [3]
Pressure and folding have transformed sandstone into quartz in various regions worldwide, including the trilobite fossil-bearing strata of this epoch on all continents except central Asia. [4]