202 SURFACE GEOLOGY. 



along the river, the usual course is west of south. Observations west of 

 Ascutney are wanting. It appears, therefore, that the observations are 

 not ample enough to say positively, though it is probable, that the stria- 

 tion of Ascutney is like that of Monadnock. 



Mt. Pleasant, in Denmark, Me., may also be mentioned as allied to 

 Monadnock. South of the mountain the course is S. 12° E.; east, it is 

 S. 20° E.; north, it is S. 8° E., while one observation in Fryeburg, to the 

 west, reaches S. 32° E. On the summit the striae run S. 41° E. On the 

 north-west side, following down the path, good examples occur of the 

 course S. 3i°-33° E. Lower down are others less satisfactory, running 

 S. 52° E. Not far from the Half-way house are some seemingly local, 

 running west down the hill. 



Certain other elevations in the state, with topographical surroundings 

 like Monadnock, show little difference in the direction on the summit 

 and the neighboring plain. Such are the Moose mountains in Brookfield 

 and Middleton, Teneriffe in Milton, New Durham ridge, Catamount hill 

 in Pittsfield, Blue hills in Strafford, Saddleback in Northwood, Temple 

 mountain, Barrett mountain in New Ipswich, etc. Crotched mountain in 

 Francestown, Ossipee in Carroll county, and Pawtuckaway in Notting- 

 ham, have not been studied, while Green mountain, Effingham, is too 

 thoroughly disintegrated to preserve any markings. 



Predominant Courses of Stri^. 



The Vermont geological report states that the strias may be classed in 

 three divisions, — those pointing to the south-west, south, and south-east, 

 the first being the least common. The south-west course is much more 

 infrequent in New Hampshire, while the south-east direction is more 

 prevalent than in Vermont. A sketch map in Volume I (p. 542) shows 

 the general relations of these three kinds of movement for both states. 

 Many of the striae are so disposed that they may be believed to be the 

 result of valley movements. In our researches we have constantly asked. 

 How much do topographical features influence the course of the striae.? 

 The replies forced upon us insist that a portion of the directions is due 

 to topographical features, while others — the majority — pursue a fixed 

 course, in total disregard for all obstacles. The first we have styled val- 

 ley movements. A part of these are distinguishable from the others 



