Pattern of stonework utilizing horizontal joints.
A sedimentary rock formed from shells and organic sea matter. If undergoes metamorphosis becomes marble. Limestone was often used in nineteenth century monuments as a base. May be difficult to distinguish from marble, but tends to be grayer in color then the originally white marble.
A horizontal support for masonry or a stone spanning an opening; A horizontal beam, over a door or window which carries the weight of the wall above.
