208 ON C0NGL0M£RAT£1> ROCKLS. 



of granular limestone appear imbedded in com- 

 pact limestone. 



III. Flcetz Conglomerated Hocks. 



The conglomerated rocks of the floetz class, arc, 

 Sandstone-Conglomerate, Sandstone, and Trap- 

 Tuff. 



1. Sandstone Conglomerate* 



This rock is composed of rounded and angulaf 

 pieces of granite, gneiss, mica-slate, clay-slate, por- 

 phyry, grey-wacke, felspar, jasper, quartz, &.c. 

 varying in size from that of a pea, to much above 

 that of a man's head. These fragments are con- 

 nected together by means of a basis composed ei- 

 ther of iron-shot clay, quartz, or of smaller frag- 

 ments of the same nature as the larger. 



It usually occurs resting upon transition rocks, 

 sometimes also lying on primitive rocks. It is a 

 frequent rock in this country. 



Sandstone. 



This rock is principally composed of quartz^ 

 which is either in roundish or angular grains, or 

 more or less regularly crystallized : it is seldom 

 pure, more generally it is intermixed with scales 



