Page:The Journal of geology (IA journalofgeology11893univers).pdf/383

attains a greater thickness, no measurements could be made, though it can safely be said that it does not exceed a few hundred feet. The relations made out in the area now under consideration, allow of a thickness which agrees well with that found in Mt. Washington. A locality which illustrates this will be here briefly mentioned, because the structure is so simple as to afford reliable results. The locality is a knoll called Pine Hill, lying at

Fig. 6.View of Pine Hill on the southeast flank of Tom's Hill, seen from a point to the west. A, Riga Schist. B, Pine Hill composed of Egremont Limestone. C, Approximate position of cap of Everett Schist.

the southeast foot of Tom's Hill south of the railroad. The dips are low, due entirely to pitch, and the thickness of the limestone less than 100 feet. (This locality is marked P on the map). North of the track (A in Fig. 6) is seen the Riga Schist pitching south at an angle of about 35°. Across the track and a little farther east is Pine Hill (B), composed of a pure, white limestone dipping conformably over the schist, and capped on its south slope by a thin layer of the Everett Schist. The outcrops of this rock are hidden in the view, but their approximate position is shown by C. The thickness of the Riga Schist and the Canaan Dolomite have