original: these rock formations are characteristically composed of sandstone with layers of quartz .
simplifications: these rock formations are characteristically made of sandstone with layers of quartz . characteristics of these rock formations are sandstone composition with quartz layers . these rock formations are usually made of sandstone with layers of quartz . these rock formations are made of sandstone with layers of quartz . these rocks are usually made of sandstone with sheets of quartz . these rock formations are characteristically composed of sandstone with layers of quartz . these rock formations are characteristically composed of sandstone with layers of quartz . these rock formations are characteristically composed of sandstone with layers of vitreous silica .