397 



monadnock, probably a remnant of the tertiary peneplain and near the 

 level of the pleistocene peneplain which forms the "skyline" in this region. 



SCALE- 'Q ^i^ . 



41 36 28 



46 ° GUAGE 



35 . 36 



23 



30 



30 



26 



31 



24 



122 



17 



23 



21 



Pig. 1. Map of Hill Pond, showing depth in inches at 10-ft. intervals when at the 



overflow point. 



'1 he pleistocene peneplain is very much dissected in this locality. This 

 particular monadnock is completely isolated, valleys having cut into its 



