Chap. 1 6.] Porphyry y Granite, &c. 103 



OF SEVERAL GENERA, MORE OR "J 



LESS IN NUMBER, UNITED IN Vuniverfal breccias. 

 BRECCIAS. - J 



DOUBLE BRECCIAS, 



Fragments of porphyry, with a pafte of 

 Varieties, -J porphyry. 



Fragments of granite, with a pafte of fchirl. 



