■I 1 8 Bulletin of Lahoratoiies of Denison University [Voi. xiii 



have so directed the run-off water of showers as to reveal the 

 strata, but seldom forming a section that will admit of precise 

 measurement. In general the uplands and slopes have a coat- 

 ing of residual material, while aggraded valleys prevail else- 

 where. These conditions therefore have precluded any great 



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VLATL L 



accuracy in obtaining vertical sections of rock structure. Nev- 

 ertheless we feel that the data obtained adds something to pub- 

 lished reports on the stratigraphy of the immediate region.^ 



The thickness of the formations, as well as the vertical 

 range of dissection, was established by the barometer, the var- 



'Rep. Geol. Surv. Ohio, vol. iii, Pt. I, 1874. PP- 349> 352- 



