Oklahoma Moss Rock and Boulders Oklahoma quarries producing material from patio flagstone, large slabs and boulders. Materials are shipped bulked on flatbeds in amounts of 10 to 24 tons throughout the Southeast and East Coast and into Colorado and Wyoming. Boulders from 1,000 pounds to 9 tons or so. Oklahoma Moss Rock and Boulders are hard rock, a sandstone quartzite, that is surface harvested to preserve that unique combination of rusty grey colored rock covered in full large amounts of thick moss and patches of lichens.
