456 MYRON L. FULLER 
it is necessary to know the area of the cross-section of the 
stream, the velocity of its flow, and the percentage of sediment 
carried. The first two values are indicated by the esker and the 
ove 
Oe d 
i 
CL 
NARRACANSETT BAY. 
a} 
1 MILF. 
Fic. 1.—Map of Glacial Deposits, Barrington, R. I.t 
Contour interval, 20 feet. 
material of which it is composed. The latter must be estimated 
from observations upon glacial streams existing under similar 
*The geology is taken from map given by Mr. J. B. Woodworth in Seventeenth 
Ann. Rept. U.S. Geol. Surv., Pt. I, Pl. LXII. 
