546 JOHN L. RICH 



is strictly marginal. Farther down it swings behind a low knoll 

 probably of rock; then takes a straight course southeastward to the 

 main channel. C, which was probably initiated by a stream flowing 

 from the end of the ice-lobe, seems later to have developed into a 

 lake outlet, draining a lake held up in the Moreland valley by the 

 retreating Moreland lobe. Channel D, formed along the eastern 

 margin of the Moreland lobe, may be classed as marginal-morainic. 

 It enters the main channel E as a rather deep trench with banks only 

 moderately trimmed. Its lower portion might well be mistaken for a 

 small valley cut by a post-glacial stream were it not for the fact that 

 the only stream, a very small one, which enters it has built a fan across 

 it. In its upper part the channel becomes shallower and finally one 

 bank, the western, disappears. The other continues for considerable 

 distance farther, gradually becoming less and less distinct. 



E has already been described (p. 539). The main channel below 

 A, is very pronounced, flat bottomed, and from four hundred to six 

 hundred feet in width, with sharply trimmed drift banks twenty to 

 thirty feet high. 



An interesting drainage condition is found in connection with 

 these channels. One-half mile below the junction of A and B a 

 stream from the hills on the east has built a fan entirely across the 

 channel. This has completely reversed the drainage of the channels 

 above the fan, causing all the water to flow out northward through C, 

 and thence to the stream in the Moreland valley. The grade of C, 

 which was doubtless a lake outlet, is so low that a sHght blocking of 

 the channel three-fourths of a mile below was sufficient to reverse its 

 stream. 



In so far as could be determined, these channels were practically 

 contemporaneous in origin, except that C must have persisted longer 

 than the others. There is no apparent hanging condition at the 

 junction of any of the channels with the main one as might be expected 

 if the stream in one ceased flowing for any considerable time before 

 that in the others. 



At the foot of Johnson Hollow is a large delta formed, apparently 

 in a marginal lake, by the stream flowing down the channel. The 

 top of the delta is at the 1,000 feet contour, with the northern part 

 slightly lower than the southern. The delta is very perfect, with 



