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



superimposed on hard rock as, for example, at Shelter Rock. 



That part of the drainage coming down the valley opposite 

 Beaver Brook met the drainage from Still River ice lobe in the 

 valley north of Shelter Rock, and as a result heavy deposits of 

 stratified drift were laid down. The peninsula-like mass of 

 drift beyond the river north of Shelter Rock appears from its 

 form to have been built up as the delta of southward and east- 

 ward-flowing streams; probably the drainage from the hilltops 

 united with streams coming down the two valleys. The lobes of 

 stratified drift extending from the ridge may have been built 

 first, and later the connecting ridge of gravel which forms the 

 top of the hill may have accumulated as additional material was 

 washed in, tying together the ridges of gravel along their western 

 ends. The mingling in this region of stratified drift of all grades 

 of coarseness indicates the union in the same basin of debris 

 gathered from several sources. 



Between Danbury and New Milford no moraine crosses either 

 the Rocky or the Still valley, but the abundance of till which 

 overspreads the whole country indicates a slowly retreating 

 glacier well loaded with rock debris. The- mounds of stratified 

 drift scattered along the valley doubtless represent the deltas of 

 streams issuing from the ice front. The waters of Rocky River 

 were ponded until the outlet near Jerusalem was uncovered and 

 the disappearance of ice from the ravine below allowed an escape 

 to the Housatonic. Stratified drift is present in greatest amount 

 along the valleys of Still River and the west fork of Rocky River, 

 indicating that these were the two chief lines of drainage. The 

 uplands are practically without stratified drift. 



Along the valley of the Housatonic, glacial material is chiefly 

 in the form of gravel terraces; they extend from Gaylordsville 

 to New Milford, in some places on one side only, in others on both 

 sides of the river. Part of these gravel benches are kame ter- 

 races, as shown by their rolling tops and the ravine which sepa- 

 rates the terrace from the hillside; others may have been made 

 by the river cutting through the mantle of drift which was laid 

 down in the period of land depression at the time of glacial 

 retreat, 1 or they may be a combination of the two forms. In 



J Rice. W. N. and Gregory, H. E., Manual of the Geology of Connecticut: Conn. 

 Geol. and Nat. Hist. Survey Bull. 6, pp. 34-35, 1906. 



