Structural Features of the Exposures. 
265 
with a dip of 60° to the E. On the south half of the ledge, 
strikes varying from 30° to 50° west of north were noted with 
dips from 30° to 40° to the N. E. In the ledges at the south 
end of the area on Section 3, Waterloo township, the observed 
strike is N. 34° W., and in the ledge on Section 34, of Port¬ 
land township, a half-mile north, strikes varying from 33° to 
40° west of north, and dips of from 30° to 40° N. E., were 
noted. In the Lake Mills area strikes of 45° and 60° west of 
north, with a dip of 40° to the N. E., were determined. In 
the medial Hubbellton area the strikes observed on the north 
ledges vary from due north to N. 20° W., with inclination of 
strata from 30° to 32° to the east. In the south ledges on 
section 2, Waterloo township, the strikes are from 15° to 20° 
east of north, with a dip of 20° to the east. The series of 
strikes occurring on the marginal areas closely correspond to 
the general outline of the range itself and roughly indicate the 
circumference of an ellipse on whose north side are the out¬ 
crops of the Mud Lake area and Island Ledge in the Portland 
area. The remaining ledges of the Portland area form the end 
of the ellipse, and the single Lake Mills ledge may be consid¬ 
ered as indicating che beginning of the south side of the fig¬ 
ure. The in-sloping strata in all of the out-crops suggest that 
these isolated areas may be the remnants of a broad, tolerably 
symmetrical trough, ot steeply sloping sides and crumpled end. 
The Hubbellton area with its gentle dips is clearly near the 
center of this basin. The remoteness of the Lake Mills area, 
together with the rapid change of direction in the strikes of 
the strata exposed in the Portland area, suggest that this fold 
may be not a simple, but a somewhat complex synclinal with 
an injutting anticlinal between the end of the Portland area 
and the Lake Mills outcrop. This would account for the slight 
difference in strike of the layers in the Lake Mills ledge and in 
the ledges at the south end of the Portland area. The absence 
of outcrops between the two areas leaves the matter simply 
one of conjecture. The evidences of disturbance here described 
are of especial interest as explanatory of the metamorphism of 
the strata which will next be considered. 
