130 STKATIGRAPIIICAL GEOLOGY. 



though on the ridge east of the road they have their normal character- 

 istics. West of Ellis river, and on the east slope of Iron mountain, we 

 have a rock very similar to that on Miles brook, and it has here an east- 

 erly dip ; while on the summit of Iron mountain the common White 

 Mountain gneiss dips north. On Wildcat branch, at the most northern 

 settlement, we have the characteristic White Mountain gneiss; but on 

 the western slope of Black mountain, at J. Y. Perkins's, and south at J. 

 R. Harriman's and J. Cheslcy's, there are many bands of fine-grained 

 pyritiferous schist, and at Chesley's there is a dark siliceous schist free 

 from iron. On the southern slope of Black mountain we have the anda- 

 lusite schist. On Rocky Branch, above Abt. Emery's, the gneisses are 

 everywhere pyritiferous. 



The following additional dips show how exceedingly variable the strata 

 are in this area. 



Three and a half miles north of the Dearborn & Philbrook saw-mill, 



White Mountain gneiss clips N. 85° E. 50°. 



George Manson's, White Mountain gneiss dips . . . . N. 72,° W. 60°. 



N. M. Cook's, limestone in the river dips N. 78° W. 20°. 



" " gneiss near the limestone dips .... N. 30°. 



Miles brook, at the falls, dip, N. 34° W. 42°. 



J. W. Brack's, White Mountain gneiss dips N. 38° W. 64°. 



A. Chesley's, pyritiferous schist dips N. 33° W° 68°. 



" half a mile north-east of house, siliceous schist dips, S. 38° E. 66°. 



Near the last, dip, N. 43° W. 



Summit of Iron mountain. White Mountain gneiss dips . . . N. 53° W. 25°. 



Three miles west of Jackson, road to Rocky Branch, dip, . . N. 13° W. 



The variation is due in a great measure to the fact that the stratified 

 rocks have been folded, and pressed against the harder, unyielding intru- 

 sive granitic rocks. We have already mentioned that a dark siliceous 

 rock was found near A. Chesley's. A similar rock is found on Tin moun- 

 tain, in the gap west and on the east side, and near the summit of Thorn 

 mountain. It is also found near the village of Jackson, immediately 

 north of the falls. 



On Tin mountain, dark siliceous schist dips N. 47° E. 80°. 



Hill west of Tin mountain, siliceous schist dips . . . . N. 7° E. 70°. 

 Thorn mountain, siliceous schist dips N. 17° E. 68°. 



