122 Bulletin of Laboratories of Denison Uniervsity. [Voi. xiii 



of Samuel Wise, a little east of Claggett's Hill, was noted a 

 fourteen inch seam of coal which has been worked some ; suc- 

 ceeding this in vertical section are fire clay, thin bedded sandy 

 layers, and, 25 feet above the coal seam, in Mr, Wise's cellar 

 (a house just constructed) a "coal blossom." On elevations 

 above this point conspicuous conglomerate strata, but not so 

 coarse as much of the Sharon, again appear ; this second hori- 

 zon of conglomerate, if not too local in distribution, might mark 

 one boundary ol another member of the Pottsville formation, 

 to the upper part of which the Ohio Survey has not given final 

 classification'. 



In the hill region south of Perryton carbonaceous shales 

 were also noted below the Sharon conglomerate, which in this 

 locality forms a pronounced escarpment (Fig. 4). 



The maximum thickness of the Pottsville in Perry town- 

 ship is about 225 feet. The highest and lowest beds of the 

 formation are conglomerate ; the succession of intervening lay- 

 ers is not constant. 



Summary. In character the rocks of this township are 

 prevailingly coarse. Streams from the Logan areas deposit 

 some clay, but sandy highways are the rule. The two marked 

 conglomerate phases, the Black Hand and the Sharon, stand out 

 as shoulders in the degraded slopes. 



Careful search was made for any trace of the Maxville 

 limestone. In a few places a hard, fine-textured rock, light in 

 color, was found at the proper horizon for the Maxville ; but in 

 most cases the rock gave no response to a lime test ; in only 

 two instances was there even a slight effervescence, 



TOPOGRAPHY. 



The region is maturely dissected ; nowhere can one find a 

 mile of unbroken divide. For the most part the surface is cut 

 up into contiguous inverted bowl-like topography. The meth- 

 od of degradation which has produced this result is probably 

 complex ; the same weathering agents at work elsewhere in a 



'Prosser. Bull. Geol. Surv. Ohio, Fourth Series, No. 7 (1905) p. 13. 



