88 SURFACE GEOLOGY. 



In Hooksett the kames are well shown for a mile north from Pinnacle 

 pond. Several small ponds lie in the irregular hollows at the sides of 

 these ridges. A well marked kame forms the east border of the high 

 terrace west of Hooksett village and north-east from the Pinnacle, di- 

 rectly east of which it could not be traced, but it reappears in a ridge 

 on the south side of the road south-east of this quartz peak, thence turn- 

 ing south-west towards the principal range of these kames, the direction 

 of which seems to lie from north to south across Pinnacle pond. The 

 locality of greatest irregularity in respect to shortness of ridges, inequality 

 in height, variable course, and diverse material, found in this whole series, 

 is the first half mile south from this pond. The scale of the map, how- 

 ever, does not permit details to be shown. A deep, winding hollow 

 extends along the west side of the main ridge from within one fourth of 

 a mile of the pond to a junction with the valley of a small brook nearly 

 a mile south. A considerable portion of this hollow seems to be due to 

 excavation; and for the next mile southward, where a single nearly 

 straight ridge parallel with this brook constitutes all that we have of the 

 series, the plain, which is 30 to 40 feet above the top of the ridge, has 

 been so washed away that a wide hollow has been formed at both sides. 



Here the plain is sand or ordinary gravel, but the kame is mainly com- 

 posed of the very coarse, water-worn gravel, which forms the principal 

 portion of this series. This, however, is here found changing into coarse 

 unmodified material, in which angular boulders, mostly of gneiss or gran- 

 ite, two to five feet in their dimensions, occur almost as closely packed 

 together as possible, with the gravel of the interspaces unmodified by the 

 wearing of water. This forms a well defined narrow ridge, 25 to 40 feet 

 high, which continues a sixth of a mile, or perhaps more, when it changes 

 again to materials rounded and sorted by water, and wears the usual 

 aspect of these kames. 



Next below this long single ridge the brook finds a passage to the 

 river; and a very remarkable assemblage of kames, partly water-worn 

 and partly angular, succeeds, covering an area half a mile long and one 

 fourth of a mile wide, with short parallel or irregular ridges, most of 

 which trend from north to south. These ridges are nearly level-topped, 

 with intervening hollows at the north 30 to 40 feet deep. Near the mid- 

 dle of the area a deep hollow runs transversely across the course of the 



