DESCRIPTION OF THE GENERAL SECTIONS. 647 



material, partly of Eozoic age and partly exuded since the deposition of 

 the Calciferous. The igneous material occupies an east and west chasm 

 in the limestone, and has altered the rock in contact with it. The mate- 

 rial is sienitic and felsitic, much like the Chocorua series. On reaching 

 Little Ascutney we find partly the same eruptive rocks, breccias, and 

 gneisses, the latter making an anticlinal with the eastern part of the 

 range found at the west ends of the first five sections. I have traversed 

 this line across the state of Vermont, and find the normal structure of 

 this gneiss range in West Windsor and Reading to be anticlinal. The 

 gneiss is like that of Grantham and Newport in New Hampshire. A 

 depression in it in the west part of Reading carries a small synclinal of 

 the Calciferous mica schist, and the gneiss most likely exists as a syncli- 

 nal underneath it. This gneiss does not crop out again on the line of 

 strike until we reach Section X. 



Section VL 



In proceeding northerly the width of the sections in New Hampshire 

 diminishes, the present one being seventy-one miles long, from Effingham 

 border to the Ledyard bridge at Hanover. The coloring of the map and 

 section extends ten miles farther into Vermont. The eastern portion in 

 Maine has not been explored particularly, though confidently believed to 

 belong to the Montalban series, and so described heretofore. The ridge 

 of Lake gneiss extends into Parsonsfield from Wakefield, thus separating 

 the Montalban into two parts. The dip has been represented as uni- 

 formly monoclinal to the east in this section of Maine. Green mountain 

 consists of granite, which has come up through an east and west fissure 

 in the schists, like Ascutney, and accumulated in amount sufficient to 

 build up a considerable eminence. Our observations exhibit an anticlinal 

 to the south of the mountain, the first dips being to the south-east. This 

 has been thought to be naturally connected with the formation of the 

 fissure through which this granite has been erupted. The Montalban 

 schists through Effingham and Ossipee are like those of the typical re- 

 gion, tender, friable, imperfect, and often ferruginous gneisses. In the 

 town of Ossipee there is a closely-pressed synclinal showing this forma- 

 tion to overlie the Lake gneiss of the Winnipiseogee basin. This more 

 ancient gneiss shows itself in vertical exposures about Dan Hole pond, 



