402 



GEOLOGY 



Fig. 311. Recumbent anticline. (Van Hise, U. S. Geol. Surv.) 



Fig. 312. Syncline, C. and O. canal, 3 miles west of Hancock, Md. The 

 beds are shale and sandstone, near base of the Silurian. (Walcott, U. S. 

 Geol. Surv.) 



Fig. 313. Generalized fan fold of the central massif of the Alps. (Heim.) 



