546 



CENOZOIC TIME. 



The section (Fig. 942) shows the position and heights of the va- 

 rious terraces in the Connecticut valley at Hadley, Mass., as meas- 

 ured by Hitchcock. Some of the levels are about the same on the 



Fig. 942. 



Section of the terraced valley of the Connecticut, at Hadley; B, a brook; M, Mill River; 

 H, Hatfield; C, Connecticut River ; II, Hadley. 



two sides of the river channel (C), while others on the west are not 

 represented at all on the east side, and one low one on the east has 

 no corresponding level on the west. The terraces in the Ashue- 

 lot River valley at Hinsdale, N. H., are represented in Fig. 943 ; 

 among them there is the same kind of agreement and diversity on the 

 two sides of the stream (A). 



In Fig. 942, the Connecticut valley includes the channels of another 

 stream at M, Mill River, and of a brook at B ; and all made their con- 

 tributions of material for terrace-depositions and took part in terrace- 

 shaping. In fact, the material for the formations of a valley, like the 



Fig. 943. 



Section of the Valley of the Ashuelot River, at Hinsdale. 



Connecticut, always came in very largely through the streams of the 

 smaller valleys either side. 



3. Structure. — The material of the terraces is usually stratified as 



Fig. 944. 



Section of a Valley, with its terraces completed. 



illustrated in Fig. 944. In this figure, the river channel which it oc- 

 cupies at low water, is at R ; ab, a'b', are the flats either side which 



