GEOLOGY OF THE TIN BELT. 
35 
?dges furnish elongated outcrops, generally, though not everywhere, conforming in dip and 
strike with the surrounding schists. 
Fig. 3. indicates the distribution of pegmatite, the tin-hearing rock. Passing through 
the northwestern part of Galfney, S. G, the tin belt strikes about N. 60° E. to the vicinity 
3f Kings Mountain station, IN. C, thence turns more to the north (about 1ST. 25° E.), and 
continues across Gaston County and into Lincoln County, about ! miles cast of Lincolnton, 
N. C It thus corresponds closely with the axis of the Blacksburg fold; but the corre- 
spondence is not exact, for at Galfney the pegmatite dikes occur on the southeast side of 
the axis and hence dip to the southeast, while from Blacksburg northward they occur 
Sphere the rocks dip to the northwest, indicating that the belt crosses the axis of the fold 
it some intervening point. The relation of pegmatite to the structure of the metamorphic 
Pegmatite 
Fig. 3. — Sketch map showing distribution of pegmatite and tin in the Carolina belt. 
rocks in the northern part of the area L not so readily discerned. The pegmatite belt is 
known to continue to the southwest beyond Gafl'ney and to the northeast beyond the center 
of Lincoln County, but authenticated discoveries of cassiterite have not been made outside 
of the limits mentioned. The width of this b'^lt varies considerably; it comprises in some 
places a few narrow, closely spaced dikes, in others many dikes distributed over a belt as 
Imuch as 2 miles wide. This maximum width is reached in the northern part of Gaston 
County. 
STRUCTURE. 
The masses of pegmatite range from numerous small streaks a few millimeters wide 
injected into the country rock, and collectively forming what may be considered a single 
