592 VEINSTONES. 



lar, but finer materials : sometimes with a certain pro- 

 portion of quartz, or ofcarbonat of lime, or of both. 



SECOND DIVISION. 



Formed of materials more or less altered by 

 friction, and bearing the marks of transportation 

 or motion. 



A. Conglomerates, formed of different substances 

 often much rounded. 



B. Conglomerates, of a fine or coarse texture, 

 consisting of various fragments of trap rocks. 



These resemble many of the tufaceous con- 

 glomerates of this family that are not found in 

 veins. 



