22 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



small stream which now flows northward from Sherman, and 

 very like any of the half-dozen parallel streams in the rock mass 

 south and southwest of Danbury, all of which are subsequent 

 streams flowing along the strike. While these stream valleys 

 were growing, the southern ends of the same weak belts of rock 

 were held by southward-flowing streams which united in the 

 broad limestone area now -occupied by the city of Danbury. 



The southward-flowing streams whose heads were, respec- 

 tively, above Sherman and near Jerusalem joined at the southern 

 end of the long ridge which includes Towner Hill and Green 

 Mountain. Thence the stream flowed southward along the 

 valley now occupied by Wood Creek and reached Still River by 

 way of the valley which extends southward from Neversink 

 Pond (fig. 4). 



The preglacial course of Rocky River, as above outlined, is 

 subject to possible modification in one minor feature', namely, 

 the point where the east and west forks joined. The junction 

 may have been where Neversink Pond is now situated, or three 

 miles farther south than the indicated junction near the mouth 

 of Wood Creek. A low ridge of till is the only barrier that at 

 present prevents the western branch from flowing into the head 

 of Barses Pond and thence into Neversink Pond (fig. i). 



As thus reconstructed the greater part of Rocky River former- 

 ly belonged to the Still-Umpog system and formed a normal 

 tributary in that distant period when the Still joined the Sauga- 

 tuck on its way to the Sound (fig. 9). However, the normal 

 condition was not lasting, for the reversal of Still River, as later 

 described, brought about a complex arrangement of barbed 

 streams (fig. 4) which remained until modified by glacial action. 



In a large stream system which has been reversed, consider- 

 able evidence may be gathered from the angle at which tributary 

 streams enter. As the original direction of Rocky River in its 

 last 2*^ miles is unchanged, normal tributaries should be ex- 

 pected; whereas between Jerusalem and the head of the stream 

 entering Neversink Pond from the south, in accordance with the 

 hypothesis that this portion of the stream was reversed, tributaries 

 pointing upstream might be expected. Such little gullies as 

 join Rocky River near its mouth are normal in direction; between 

 Jerusalem and the mouth of Wood Creek, a distance of 4^2 



