U. S. GEOLOGICAL SURVEY. 



W 



SCRATCHED 

 W BOWLDERS. 



MONOGRAPH XXIX. PL. XI 



5. THIRD TILL. 



4. SECOND SAND. 



3. SECOND TILL. 



2. INTERGLACIAL SAND. 



I- LOWER TILL. 



SECTIONS OF AM 



HERST 



iiO^ 



\}Si 



k 



Show 



'NG INTERGLACIAL BEDS. 



