TIME C'F DOLOMITIZATIOX 



187 





I N s o luble: 



CONSTITUENTS 



70 60 ySO ^o cro 



CALCITE 



Fku'kk 1. — (lr(tphic Rriireseiitotion of AiiaJijses of Limestones and Dolomites 



The diagram is made up from 1.1^8 analyses of specimens from all over the United 

 States, of which 1)88 were compiled by Kies, in New York Museum Bulletin 44, 1901. In 

 the triangle each dot stands for an analysis. The percentage of each constituent of an 

 analysis Is determined by the dislance of the dot representing the analysis from the 

 corner, which represents 100 per rcii' of the respi'ctive constituent. The 100 per cent 

 MgCO.. corner is not shown, as none of the analyses showed more than 50 per cent 

 MgCO,. The diagram shows that nearly pure limestones and dolomites are much more 

 common than mixtures of the two, and that the mixed beds average higher in insoluble 

 constituents than the pure limestones and dolomites. 



