INTEinrEDIATE CHARACTER OF APPALACHIAX GRANITES 



31 



Granites of New England. 



Locality. 



Florence, Mass 



Quiney. Mass 



Rookiiort, Mass 



Mt. Asoutncy. Vt 



Near East Clarondon, Vt 



Millstone Point, Conn 



Stony Creek, Conn 



Conaniciit Island, R. I 



Symbol. 



Name. 



Of the 21 granites represented, 14 are sodipotassie, 3 (Blue Hill, Maine; 

 Barre and Woodbury, Vermont) are between sodipotassie and dosodic, 2 

 (gray and red Westerly, Ehode Island) are dopotassic, and 1 (Bethel, 

 Vermont) is persodie. 



GEANITES OF NEW JEESEY. 



A recent report of the "Building Stones of ISTew Jersey,"^ by Lewis, 

 affords definite valual)le data on the granites of an area lying between that 

 part of the Appalacliian region which forms the basis of this paper and 

 the New England region. For convenience of comparison the data relating 

 to jSTew Jersey granites are briefly presented in summary below. 



Most of t^e New Jersey granites described in the above report are 

 either hornblende-, augite-, or bornblende-augite-bearing rocks. Biotite-, 

 occasionally ^nuscovite-, and epidote-bearing varieties occur. 



Chemical composition. — The table of partial analyses below shows the 

 range in silica, lime, and alkalies in the New Jersey rocks. 



N. Table of partial analyses of New Jersey granites.^ 



'Lewis, J. Volney. Building Stones of New Jersey. Annual Report of the State 

 Oeologist for the Year 1908. Geological Survey of New Jersey, 1909, pp. 62-81. 

 =Idem, 1909, pp. 62-81. 



