

UNIVERSITY OF VIRGINIA PUBLICATIONS 



BULLETIN OF THE PHILOSOPHICAL SOCIETY 



ONS , r 



SCIENTIFIC SECTION ^ 



Vol. I, No. 1, pp. 1-40 June, 1910 



INTERMEDIATE (QUARTZ MONZONITIC) CHARACTER OF 

 THE CENTRAL AND SOUTHERN APPALACHIAN GRAN- 

 ITES, WITH A COMPARATIVE STUDY OF THE GRANITES 

 OF NEW ENGLAND AND THE WESTERN UNITED 

 STATES.''' 



BY 



THOMAS LEONARD WATSON. 



CONTENTS. 



PAGE 



[nteoductio?." 2 



■Mineral Composition 4 



Vakieties 10 



Intermediate Character of the Rocks 10 



Characteristic IIineral and Chemical Features 12 



maryland. 



Mineral Composition 13 



Chemical Composition 13 



Classification 15 



VIRGINIA. 



Mineral Composition 16 



Chemical Composition 16 



Classification 18 



NORTH CAROLINA. 



Mineral Composition 19 



Chemical Composition 19 



Classification 20 



SOUTH CAROLINA. 



Mineral Composition 21 



Chemical Composition 21 



Classification 23 



GEORGIA. 



Mineral Composition 23 



Chemical Composition 24 



Classification 26 



summary of conclusions 27 



Granites of New England 29 



Granites of New .Jersey 31 



Composition 31 



Classification 32 



Granites of the Western United States 33 



Quartz-diorites 35 



Granodiorites 35 



Summary 36 



*Read before the Section of Mathematical and Natural Sciences January 18, 1910. 



