Ice-sheet iijpon Slender Projecting Bock Masses. 401 



Some clue to the manner of decapitation of the basalt ridges 

 may be found in two trains of basalt blocks, one of which 

 is represented in Plate IX. This train, which is the one 

 of the greater interest, proceeds from the ridge known as 

 Sherman Hill,^ the extreme southwestern elevation of the 



Fig. 2. Sketch map of the Pomperaug Valley showing the distribution of 

 the tei-race deposits and of basalt trains. W., Woodbury ; S., Southbury ; 

 H., Hotchkissville; P.. Pomperaug; S. B., South Britain ; W. 0., White 

 Oaks; S. H., Sherman Hill ; R. H., Rattlesnake Hill ; C. R., Castle Rock. 

 The stippled area represents roughly the distribution of the terrace deposits, 

 and the lines of larger spots the trains of basalt blocks ; A., area of terrace 

 excavated for railroad fill. 



* Sometimes considered a part of Rattlesnake Hill. 



