id	keyword
gc-212	calcite
gc-212	rudist
gc-212	shells
gc-212	silica
gc-212	silicification
gc-212	cretaceous
gc-212	meteoric
gc-212	diagenesis
gc-212	cement
gc-212	abu
gc-212	carbonate
gc-212	area
gc-212	crystals
gc-212	equant