738 THOMAS LEONARD WATSON 
pronounced red color, which imparts a mixed reddish-gray color to 
the rock, the depth of which is proportional to the intensity of red 
color of the feldspar. 
The even-granular granites are described below under the follow- 
ing types, based on differences which are best brought out under the 
individual descriptions: The Winnsboro types (including light gray 
Fic. 1.—Rion Quarry of the Winnsboro Granite Corporation, South Carolina. 
and dark-blue gray), the Greenwood—Cold Point gray, the Bowling 
Green—Clover light gray, and the Columbia red gray. 
The Winnsboro types.—The granites near Winnsboro in Fairfield 
County are of three varieties, which strongly contrast with each 
other in hand specimens but are essentially similar mineralogically. 
One of these is a hornblende-bearing biotite granite, described on 
p. 742, and is more coarsely crystalline than the other varieties, 
which are biotite granites. Based on difference of color, the biotite 
granites are known to the trade as (1) the Winnsboro light gray, and 
(2) the Winnsboro dark-blue gray, the first being extensively quarried 
