Shell-rock materials used for shell-rock base are defined as naturally occurring heterogeneous deposits of limestone with inter-bedded layers or lenses of loose and cemented shell, to include cemented sands (calcitic sandstone). This material is processed in a manner that will result in a reasonably homogenous finished product.
Shell-rock Base is a graded aggregate base material that at least 97% (by weight) of the material shall pass a 3 1/2 inch sieve and the material shall be graded uniformly down to dust. The fine material consists of dust of fracture.
Bank Run Shell
Shell materials consist of naturally occurring deposits formed essentially of broken mollusk shell, corals and the skeletal remains of other marine invertebrates. Bank Run Shell is a "dry land" deposit excavated and directly loaded for delivery.
Bank Run Shell Base is a base material that normally consist of 3 1/2 inch or smaller material.