UNIVERSITY OF VIRGINIA PUBLICATIONS 



BULLETIN OF THE PHILOSOPHICAL SOCIETY 



SCIENTIFIC SECTION 



Vol. I, No. 14, pp. 331-333 February, 1913 



MAGMATIC NAMES PROPOSED IN THE QUANTITATIVE SYS- 

 TEM OF CLASSIFICATION FOR SOME NEW ROCK TYPES IN 

 VIRGINIA.* 



THOMAS L. WATSON and STEPHEN TABER. 



The purpose of the present note is to place on record at this time the 

 magmatic names proposed by the writers for some new rock types occurring 

 in the Amherst-Nelson counties rutile area in Virginia. The rocks are 

 described in detail in the forthcoming report on the rutile deposits of Vir- 

 ginia by the Virginia Geological Survey. Only the magmatic names sug- 

 gested for the rocks, their chemical analyses and calculated norms, and 

 their position in the quantitative system of classification of igneous rocks 

 are included in this note; the geology of the area and petrographic de- 

 scriptions of the rocks being reserved for later publication. The rock spec- 

 imens yielding the results tabulated below are from Nelson County, Vir- 

 ginia. 



Presented and read before the Scientific Section in February, 1913. 

 331 



