BULL. GEOL. SOC. AM. 



VOL.28, 1916, PL. 18 



FiorRE 1. — Gexeral View of Uplaxd I'exeplains and ixci.sed FLAX-BOTToraED Gorge of 



Susquehanna 



l''n;(i!K 2. — \'allev Flooi: exi-uskd duimm; ('oxstiuctiox of 1)a:m, showixg "Deep"" A'i 

 VALLEY OF SUSQUEHANNA RIVER AT MC CALLS FERRY, PENNSYLVANIA 



