426" B. F. Koons — High Terraces of Eastern Connecticut, 

 o-o miles above the mouth of the river, 50 ft 



lt>- " " " " (at Norwich), 110 " 



The Thames River is formed at Norwich by the union of the 

 small stream Yantic from the northwest and the much larger 

 river Shetucket from the northeast. The latter stream is about 

 twenty miles long and has its origin at Willimantic, where it 

 is formed by the union of the Natchaug from the northeast and 

 the Willimantic River from the northwest. 



As pointed out by Professor Dana there was an ice dam at 

 Norwich daring the melting of the glacier of the Chauipiain 

 period. Taking up the work where he left off, I, accompanied 

 by Arthur Hubbard, one of my pupils, have attempted to 

 make out the heights of the high terraces on the Shetucket and 

 its tributaries, above modern flood plain, and also, at those 

 points where the New London Northern Railroad follows the 

 river, the height above mean tide at New London. 



By the kindness oi Mr. G. W. Bentley, General Superintend- 

 ent of the railroad, such parts of the surveys of the road as 

 would assist me in securing the latter measurements were 

 placed at ray disposal. Likewise the surveys of the New York 

 & New England Railroad assisted me to one measurement on 

 the Natchaug. 



As a result of my investigations I found that the heights on 

 the Shetucket are : 



On the Natchaug : 



On the Hope River, a tributary of the Natchaug: 

 On the Willimantic River: 



