Answer: limestones

AnswerCrossword Clue
LIMESTONESGreat Pyramid of Giza material
LIMESTONESMammoth Cave rocks
LIMESTONESBuilding materials.
LIMESTONESSome sedimentary rocks
limestonesLIMESTONE, a sedimentary rock composed mostly of the mineral calcite
limestonesA hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement