634 



CHARLES EMERSON PEET 



place because of the competition of neighboring streams. This seems 

 to be true of the relations between Drummond Creek, a tributary of 

 Saratoga Lake, and Outlet Creek, the outlet of Ballston Lake, which 

 flows into Round Lake from the west (see Fig. 26). 



Piracy of Outlet Creek and beheading of Drummond Creek. — ■ 



Drummond Creek flows 

 northeastward into Saratoga 

 Lake through a rather 

 broad, flat-bottomed val- 

 ley, which is the northeast- 

 ern part of one of the de- 

 pressions between gravel 

 plateaus south of Saratoga. 

 Although this depression 

 extends southwest beyond 

 Ballston Lake, its south- 

 western part, including Ball- 

 ston Lake, is not drained 

 through Drummond Creek, 

 but by a stream called Outlet Creek, flowing from Ballston Lake 

 northeastward to a point a little over a mile from the lake near a 

 place named East Line, where it makes a sharp turn southeast- 

 ward and descends through a narrow, steep-sided valley with a 

 high gradient to Round Lake (188 feet in altitude). At the point 

 where Outlet Creek makes its southeastward turn its floor is 

 something less than 280 feet in altitude. The question whether 

 Drummond Creek has been beheaded by the working back of Outlet 

 Creek, which tapped it and thus diverted its waters into Round Lake, 

 would seem to rest upon the question whether Ballston Lake, which 

 is now 285 feet above the sea, was ever enough higher to drain over 

 the divide at 300 feet, down Drummond Creek into Saratoga .Lake. 



Fig. 26. — Piracy of Outlet Creek. 



O. C. = Outlet Creek; D. C. = Drummond Creek; 

 B. L. = Ballston Lake; R. L. = Round Lake; S. L.= 

 Saratoga Lake. 



CORRELATION OF TERRACES IN THE CHAMPLAIN VALLEY WITH THOSE 

 IN THE HUDSON VALLEY. 



In the description of the wave-wrought terraces of the Lake 

 Champlain region mention was made of the fact that in the upper 

 series of terraces there is a range from the highest to the lowest of 



