Shelly limestone is a pale, grey, highly fossiliferous limestone, composed of a number of fossilized organisms such as corals and mollusks. FOSSIL is a standard protocol for allowing serial communication for Telecommunications programs under the DOS Operating system. Limestone is a Sedimentary rock composed largely of the Mineral Calcite ( Calcium carbonate: CaCO3 Corals are Marine organisms from the class Anthozoa and exist as small Sea anemone –like Polyps typically in colonies of many Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 It varies in terms of color and texture. Varieties can be found throughout the world.