OUTLINES OF GEOLOGY. 



65 



The earthy minerals found either in veins or imbedded, 

 are also numerous. Among them are : 



In the slate, Made, Staurotide, Dipyre. In the other 

 rocks : 



Quartz ; Spinelle ; 



Garnets ; Wernerite; 

 Sahlite ; Pyroxene ; 



Epidote ; Idocrase ; 



Tremolite ; Actinolite ; 



Idocrase ; Tourmaline ; 



Hypersthene ; Beryl ; 



Zircon ; Gadolinite ; 



154. This order occupies a large surface in the U. States. 

 Forming the White and Green Mountains, it may be traced 

 along the outer or Atlantic ridge of the Apalachian group to 

 the state of Georgia. From this ridge innumerable others, 

 of small height, proceed in a southerly direction, dividing the 

 space between that ridge and the green sand formation into 

 separate basins. One of these ridges leaves the highlands, 

 on the east bank of the Hudson, and terminates at the Bat- 

 tery. Between the latter point and Union Square it is cover- 

 ed with diluvium. Another extends through Jersey to 

 Trenton, where it forms the falls of the Delaware. A third 

 follows the western bank of the Schuylkill, and strikes the 

 bank of the Delaware near Wilmington. A fourth is to be 

 seen west of Baltimore, at Ellicot's mills. Many others 

 might be cited. It is to the decomposition of the rocks of this 

 formation in which quartz abounds, that we are to ascribe 

 the sandy pine barrens of North and South Carolina. When 

 hornblende predominates, the surface is covered with the red 

 clay so abundant in Virginia and North Corolina, although 

 these soils may also be derived from granitoid rocks. 



155. The granular limestones and dolomites of this form^ 

 ation furnish the most beautiful material for architecture in 



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