south of it, and the equally valley-forming shales and marls of the Salina formation to the north. Its crest is Oriskany which in this part of the field is almost everywhere a chert rock 30′ or 40′ thick, whose broken down bowlders are spread all through the valley on the south side and frequently completely conceal the supporting Lewistown limestone formation on its north flank
Lewistown limestone quarries.
Limestone Quarries.—A small quarry in the limestone formation has recently been opened upon the property of Reuben Lauver, situated close to the Monroe-Fayette township line and exposing about 20′ of the upper portion of No. VI upon a 24° southeast dip.
A short distance east of Lauver’s G. & S. mill in Monroe township near Evandale, the upper Salina olive and gray line shales outcrop along the road dipping southeast, away from the Slenderdale anticlinal, which passes through the northern extremity of this township. These rocks show a marked northwest cleavage, still more conspicuous in the Bloomsburg red shales which outcrop behind or north of the mill.
Two small nameless quarries have been opened in the Lewistown limestone flanking the Flintstone ridge south of Evandale and about a mile east of the Fayette line. Both seem to have been entirely abandoned and developed a rather impure limestone near the bottom of the formation.
West of Richfield and about 150 yards south of the road there are several small independent quarries in this ridge so close together, however, as to practically form one opening for a length of several hundred feet along the ridge. These are known as “Benner’s Quarries;” but none of them were working during the summer of 1888. At the most western end of the exposure the limestone beds exhibited a tight fold, with dips of from 35° to 40° N. 45° W. and S. 45° E. The stone is good in certain layers but not conspicuously so, and the entire series exposed will not average over 30′ in thickness, mostly very dark blue limestone.
