Bloomsburg shales into two and elevates between the stream and the river a smoothly rounded ridge or plateau of the Upper Clinton brown and olive shales.
At the school house the red shales dip 20° N. N. E., succeeded immediately north of the cross roads by the marls of the upper Salina group on a similar dip, and they in turn, by an excellent outcrop of the lime shales of this formation here so calcareous as to contain some good limestone beds creating a decided ridge and outcropping a little north of the road running to Mifflintown over Flintstone ridge.
These limestone beds have been opened within a mile of the Fermanagh line and quite extensively quarried for farm use near, Gingerich’s on a 15° N. dip. Between this outlying ridge and the main limestone in the Flintstone ridge there is a wide belt of limestone land caused by the low 10° dip of the rocks. They are exposed as soft olive and gray lime shales with some thin red beds all along the road east to Van Wert, south of which village the Bloomsburg red shales again show on the crown of the axis with dips of 40° N. W. and 30° S. E., maintaining that position into Delaware township.
Between these red shales and the limestone ridge on the south side of the anticlinal there is a belt of the upper Salina lime shales corresponding to the one occupying the valley north of Van Wert; but the rocks show steeper dips here, consequently narrowing the width of the valley holding them.
Beyond the right branch of Doe creek at J. Lukens’ place there is an excellent exposure of these lime shales, dipping S. 15° E. 30°; but the chert of the Oriskany ridge to the south of this point has completely concealed the Lewistown limestone No. VI, whose presence can only be judged of by the numerous sink holes occurring along the north flank of this ridge.
Lewistown limestone quarries.
West of the brick church, however, the Lewistown limestone is well exposed nearly 80′ thick in two small quarries, the bottom of the formation being rather impure and shaly;
