CaMg ratio classification of main limestones (Mississippian) in South Wales,U.K.

The highly dolomitized Main Limestones of approximately Mississippian age, which crop out in South Wales, are classified according to their $\text{Ca}\text{Mg}$ ratio values. The results based upon the $\text{Ca}\text{Mg}$ ratio determination of these rocks permitted their classification into six major categories, namely: (1) limestone; (2) slightly dolomitized limestone; (3) dolomitic limestone; (4) calcitic dolostone; (5) dolostone proper; and (6) magnesian dolostone.It is concluded that dolostone proper and calcitic dolostone tend to dominate in the Main Limestone rocks of South Wales.