BULL. GEOL. SOC. AM. 



VOL. 14. 1902. PL. 31 



Figure 1.— Saxdstoxz IxiRrsioy? ly Coal Beds 



Figure 2.— Sandstone Intrusions in Coai. Beds 



SANDSTONE DIKES IN COAL BEDS 

 Oppel shaft, Zaukeroda, near Dresden, Germany. From photographs by A. Borner 



