Board Thread:Suggestions forum/@comment-27462565-20160830114441/@comment-27388204-20160903105127

Rayn Turammarth wrote: I think of sandstone as being Sand that has been compressed over many years into a rock-like substance, whereas Limestone is a buildup of minerals that have hardened.

 Aranwë Tûrammarth  Send a Swan! Limestone, to be more accurate, is composed of the skeletal remains of marine animals, such as mollusks, corals etc.