EKWAK RIVER 
8 F 
Sutton MilJ lakes, extends a plateau which is at an elevation of 400 feet 
above tide. Through this, in latitude 54'’ 20', rounded or oval mas.ses 
of trap protude to a height of from fifty to one hundred feet. Through 
the plateau, on a line where there is al.so a break in the trap roek.a, a 
deep narrow valley has been eroded in a north and south direction, 
whicli is now occupied by the waters of Sutton Mill lakes. At the 
lake the .surface of the clay plain is 390 feet and tlie surface of the 
water of the lake i.s 290 feet above tide. Soundings show that the 
bottom of the southern part of the lakes is 310 feet below the plain 
and that of the northern part 250 feet below this datum or only forty 
feet above tide. 
Drawn by P. M, Papinenu, 
C1.IKKS OF Tiai* AXn CTfARAf'TEKI.STIC TAU.'S AT GORGK, NARROWS OF 
SL'TTU.N MiU, I.AKES. 
Silurian lime- 
«tone on 
Trout river. 
Hilurian limestone is found on Trout river, which drains Sutton Mill 
lakes, and is also found in the bed of the lake just north of the trap rocks. 
The rocks at the narrow.s of the lake are cliffs of trap one hundred and 
