Page:The Journal of geology (IA journalofgeology11893univers).pdf/312

western part of the great belt which Professor Dana has mapped in this section of Berkshire county. While it has not been found possible to accurately measure its thickness, it may be safely stated that the thickness never exceeds 600 to 800 feet, and that the beds thin out toward the south end of the mountain. They

Fig. 4.Series of curves showing the probable form of the flexures in the rocks of Mt. Washington.

also thin out toward the center of the mass from either side. The minimum thickness in the southern portion of the area is probably something less than 100 feet. The general truth of this statement is borne out by an examination of the map and sections (Sage's Ravine, Bear Rock Falls, etc.) As the limestones do not again appear on the southeast flank of the Cornwall-Sharon core of older rocks, it is probable this horizon never