shell rock is a limestone composed of calcium salts. in the field of construction, a large number of different materials are used.

and are beige biogenic calcium carbonate chemogenic composed compressed construction crustaceans cutout deposits details different direction eocene field foraminifera fossils fragments from geology geometric geometry graphics height image inside interior jurassic large life limestone marble marine materials mineral nautilus number nummulites oceanic origin ornament prehistoric rock rocks salts scratch sedimentary serpentine shape shell shells starfish stripe unique used