656 STRATIGRAPHICAL GEOLOGY. 



Sections X-XIV. 



These have been ah'eady described on pages 86-97, and figured more 

 in detail upon Plate VI than upon our general map. We have also added 

 something to X and XI from Vermont, besides a great deal to XV in the 

 Canadian portion of the sheet. The west end of Section X in Lancaster 

 is obscure, the dips not being readily understood on account of the nature 

 of the rocks. In Lunenburg, so far as known, the Lyman group is nearly 

 ubiquitous, with a westerly inclination. Miles mountain is of monoclinal 

 westerly-dipping Montalban strata, having Lyman schists upon both 

 sides, so that it may for the present be set down as anticlinal. The Coos 

 group appears at West Concord, then the Lisbon series, probably with 

 easterly dips. The Waterford slate range has the same position still far- 

 ther west, followed by a broad expanse of the Calciferous mica schist in 

 St. Johnsbury, Danville, Walden, and Hardwick, 



Section XI shows the continuation of the Northumberland and Lisbon 

 rocks into Guildhall, dipping westerly, beneath the Lyman synclinal of 

 Burnside mountain. The remnant of the latter is a clay slate, and the 

 Coos mica schists are located between this Lyman rock and the Montal- 

 ban of Granby. The last series is better developed than upon Section X, 

 and displays unmistakably the anticlinal structure. Inverted Coos schists 

 appear on the west side of this Montalban patch, and are believed to rest 

 upon the latter group, but to dip beneath the Calciferous group of East 

 Burke by an overturn. The synclinal in East Burke is well marked, 

 while an easterly dip is persistent through to the granitic axis in the cen- 

 tre of Sheffield, where they dijD in the opposite direction. 



Reference has been made already to the west end of Sections XII and 

 XIII. Inasmuch as the north-west sheet could be easily drawn so as to 

 include a part of Canada, I have prolonged the short section XIV, (PI. VI, 

 Fig. I) to Massawippi lake. It exhibits next to New Hampshire, first, a 

 little clay slate; second, a broad band of the Coos schists; third, the Cal- 

 ciferous mica schist ; fourth, a repetition of the clay slate, and perhaps 

 the continuation of the range bordering the Calciferous group on the 

 west side through northern Vermont. Logan connected this slate with 

 the limestone succeeding it on the west, carrying Hclderberg fossils, but 

 on account of its situation I have believed it must be the equivalent of 



