Proceedings Am. Philos. Soc. Vol. LII. No. 211 



Plate XVII 



Cryst.\lline Rocks e.xposed in Railway Cuts near Baixa Verde, Rio Grande 



DO Norte. 



Fig. a. Showing weathering of the dike rocks in the third cut northwest 

 of Baixa Verde. 



Figs, b and c. Granite-pegmatite dikes in biotite-schists, second cut beyond 

 Baixa Verde. Fig. c shows the levelling of the surface by decomposition. 

 Topography is not affected by these dikes and schists. 



Photographs by E. Leib, May, 191 1. 



