Stone Mountain Limestone®. www.stonemountainlimestone.com. This Ordovician Period Industrial Grade Limestone is 450 million years old. Stone Mountain Dolomitic Limestone affords the best overall value armour, wall, & steps on the market today. An ideal stone for any one looking for great aesthetics, value and quality. This uniform magnesium-rich Ash Blonde stone gives off a color midway between golden and light chestnut (usually quite fair and has some ashen (grey) buff undertones to it). You’re gonna want this value stone. Sizing: Armour (=14, 24, 30” H-2x3’, 3x4’, 4x6’), - 12-14”Hx 2-3 D x 3-5 L, 24” H x 2-3 D x 3-5 L. Drywall (=2”,4”,5-8”, 8-10”)- H x 2-3 D x 3-5 L, 10-12” H x 2-3 D x 3-4 L (2x3 3x3). Steps (=2-8”)- 2-4/5” H x 2-3 D x 3-4 L(2x3’,3x4’,4x6’),6-8”Hx 2-3Dx 3-5 L.