650 STRATIGRAPHICAL GEOLOGY. 



thoroughly that they are properly classified. In order to explain their 

 place in West Hartford, one of two alternatives must be taken : either 

 these micaceous quartzites are the equivalent of the clay slates, since 

 the two formations dip tov\^ards each other beneath the limestones, or 

 there must be tv^o faults, one on each side of the quartzites, to enable 

 them to lie between two calcareous areas. The larger fault would in 

 this case stretch along the valley of White river, perhaps running up to 

 the neighborhood of Copperas hill. After leaving West Hartford the 

 limestones reappear, more thoroughly calcareous than before, and dip- 

 ping at a much smaller angle easterly, or in the same direction. If this 

 rock be followed through to Barnard, we find three well marked folds 

 in it, with a supposed fault before coming to the clay slate group again. 



Section VII. 



This was not one of the original sections marked out. It was found 

 desirable to represent the rocks along its route, and therefore observa- 

 tions were taken for it from Freedom, just touching the north base of the 

 Ossipee mountains, passing thence north of west to Sandwich notch. 

 Our specimens and observations have been taken along this line. Reflec- 

 tion shows that this is an unfortunate route, because quite crooked and 

 terminating too near Section VI. I have therefore made use of whatever 

 observations could be had along a line farther north, and will draw the 

 profile to fit the new locality, saying what seems to be true of it, hoping 

 to be able to travel over the ground directly along the line before the 

 representation has been finally engraved and colored. Should there be 

 any discrepancy between the description and the protraction, the reader 

 may know the latter to have been obtained from information provided 

 subsequently to the preparation of the text. 



As thus altered, Section VII commences near Sebago post-office, in 

 Maine, reaches New Hampshire in Eaton, passing then through Madison, 

 Tamworth, Sandwich, Campton, Ellsworth, Wentworth, and Orford, and 

 in Vermont through the limits of Fairlee, Thetford, and Strafford. The 

 total distance through New Hampshire is fifty-nine miles ; from the 

 extreme point in Maine to the end in Vermont, eighty-seven miles. 

 On this line we first touch the outer edge of the White Mountains. 



From Sebago across to Chocorua pond the rocks are exclusively Mont- 



