Journal of the Mitchell Society 
8 
[May 
felsites and rhyolites on which it rests, its crystalline structure 
being due to subsequent metamorphism. 
The writer, rather, believes that the rock has remained essen- 
tially unchanged since its consolidation, and that its formation 
was similar to that of arkose, viz: that its component minerals 
are the detrital fragments of a rock or rocks rich in quartz and 
feldspar. Many of the feldspars are rounded, suggesting a clastic 
origin, and are roughly arranged in layers parallel with the kaolin 
bands. The chemical analysis, as far as it was carried out, is 
very much like the analysis of the average rhyolite, and it is 
highly probable that the materials of which the rock is composed 
were derived from such acid volcanic rocks as occur in great 
abundance in the vicinity. 
The writer wishes to express his indebtedness to Professor Cobb 
for suggestions in preparing this paper, and also to Dr. Pratt and 
Mr. Laney for kindly loaning him material for comparison. 
Department of Geology, 
University of North Carolina, 
Chapel Hill, N. C. 
