DRUMLINS. 



285 



four miles wide, over which scarcely any of these hills are 

 found. Still farther inland, a longer range can easily be 

 traced. Beginniug in the vicinity of Portsmouth, ^s 1 . H., this 

 interior series is well developed, in a southwest direction, 

 through Rockingham county to Amesbury, Mass. Thence, 

 on, it completely covers the townships in Essex county on 

 either side of the Merrimack River to Lowell, and continues, 

 with little interruption, through Middlesex county to the 

 Ticinity of Fitchburg, Worcester county. To a limited ex- 

 tent these same typical hills abound still farther west through 

 the northern part of Worcester and Franklin counties to the 

 Connecticut River. Areas of them are also reported running 

 up from Ashburnham, Mass., to Weare, X. H. ; also in the 

 western part of Cheshire county, X. H., and in the vicinity 

 of Worcester, Mass., as well as about Amherst and in the 

 northeastern part of the State of Connecticut.* 



The following additional facts have been collected by 

 Professor Davis : f 



A fine series of drumlins stretches from about Spencer. 

 Mass., to Pomfret, Conn., but the detailed study that it would 

 well repay has not 

 yet been attempted. 



Members of this 

 series occur near 

 Charlton station, 

 Boston and Albany 

 Railroad, with their 

 bases at an elevation 

 of nine hundred feet 

 above sea-level, and 

 others stand still 

 higher. The por- 

 tion of the group in Connecticut is described by Percival as fol- 

 lows : "The district extending north from Hampton, through 



Fig. 90— Outline of parallel drift-hills, in central New 

 York. (Davis.) 



* Upham, in " Proceedings of the Boston Society of Natural History," vol. 

 xx, pp. 231, 232. 



f "American Journal of Science," vol. cxxviii, pp. 410, 411. 



