GEOLOGY OF THE MERRIMACK DISTRICT. 575 



the country west of the Crotched mountain range of Lake gneiss. The 

 rock a mile south of the south-west corner of Deering, in Francestown, 

 dips 80° N. 60° W. On top of a high hill in the south-west part of Deer- 

 ing, near W. Wilson's, the rock is abundant, and dips 65° N. 50° W. At 

 J. O. Dinsmore's is a hard quartzite, dipping 80° S. 30° E. This gives us 

 an anticlinal, and there must be a synclinal to the east, before coming to 

 the westerly dipping Lake gneiss on Gregg's hill. Through central 

 Deering, along the route of Section III, are westerly dips of gneiss from 

 J. Downing's to S. Carr's, more than a mile west of Deering church. 

 They stand nearly vertical here, but dip 50° S. 80° E. half a mile west, at 

 I. McKean's. Hence we have a synclinal here, and this easterly dip is 

 continuous to the Contoocook river. Through the north part of Deering 

 the rocks dip very much, as along the section shown in Fig. 97. West 

 of J. B. Hall's is a hard, flinty rock, dipping 75° S. 80° E. At J. H. 

 Gould's, on top of a hill, the schists dip S. 65° E. On reaching the 

 valley by L Smith's, the same flinty rock dips 65° N. 50° W. Large 

 garnets sometimes occur with it, and many layers are ferruginous. A 

 mile east the ferruginous element is more abundant, the dip being the 

 same. West of the school-house by B. Gove's, the rock is as red as ferric 

 oxide ever occurs, with a north-east strike. There are some gneissic 

 layers in a similar rock, dipping 85° N. 75° W., on the town line. This 

 brings us nearly to the vertical layers of Lake gneiss in Weare. The 

 hills in the south part of Henniker are composed of mica schists of 

 different aspect and position, and therefore are not included in this area, 

 though the strike would naturally seem to include with it all the rocks 

 west of the gneissic range, as far as the notch made by alluvium along 

 the line of the old New Hampshire Central Railway. 



Another ferruginous area, thought to be like these, lies in Hopkinton, 

 Concord, and Boscawen, apparently occupying the region beneath the 

 abundant alluvium of the Contoocook. It lies east of the narrow porphy- 

 ritic gneiss range in the east part of Hopkinton. They have the strike 

 N. 20° E., at S. Gale's, with easterly dips nearer the village. Nearer I. 

 Proctor's, in Concord, a mile west of Little Turkey pond, the dip is 80° W. 

 The old gneiss near Tyler's station, Hopkinton, joins a ferruginous rock 

 dipping 75° N. 65° E. West of J. Patch's the dip is 20'' N. 65° E., and it 

 may be as low as 10'^ in some exposures. The same style of very rusty 



