402 STRATIGRAPHICAL GEOLOGY. 



disappeared. West of this anticlinal there is another mass of granite, 

 which seems to mark a fold in the Calciferons. To the westward the dip 

 is altogether westerly; and three or four supposed overturn synclinals 

 appear there. The dips in Section XIII, naturally protracted, give us 

 the fan-shaped structure, which may be easily resolved into a double 

 synclinal basin. The synclinal form appears yet more distinctly after 

 passing into Canada. I do not present any diagram in the text to illus- 

 trate these sections, hoping that the way may be opened to publish in 

 the Atlas the entire group of them as they cross the two states of Ver- 

 mont and New Hampshire. Their publication is not authorized at the 

 time of writing this brief notice of them. 



In brief, all the sections across this Calciferous formation can be best 

 interpreted by constructing them upon the theory of their more recent 

 age than the adjoining bands of Huronian, — one, in the Connecticut val- 

 ley, and the other, skirting the east base of the Green Mountains. This 

 is also the position assigned to the continuation of the limestones into 

 Canada by Sir W. E. Logan. He did not speak so clearly of the clay 

 slate band, not separating it from the limestone, and calling them both 

 by the indeterminate name of Gaspe. If the first position assumed is 

 sound, that the limestone or Calciferous overlies the Huronian, then it 

 will easily follow that the slates will come between them in age, as they 

 do in territorial distribution, and are to be called Cambrian, Another 

 view might be taken of the westerly band. It might be considered as a 

 narrow, closely pressed Helderberg synclinal, inasmuch as Upper Hel- 

 derberg fossils occur in somewhat similar layers on their course at Lake 

 Memphremagog. It would be better to say that the band belongs to the 

 Cambrian series ; but in Helderberg times, when this entire northern re- 

 gion was submerged, there was a subsequent slaty deposit of that later 

 age directly over and derived by disintegration from the Cambrian, The 

 same supposition may be extended to the eastern band, as all observers 

 so far have agreed that this series underlies the Bcrnardston Helderberg. 

 These slates make up the mass of West mountain, situated to the west 

 of the village, underlying the Helderberg limestones. 



