140 Bulletin of Laboratories of Denison University. [Vol. Xllt 



patches, and sonKtimes has conglomerate beds of considerable 

 horizontal extension, yet it does not represent as constant condi- 

 tions of sedimentation. Consequently in the Manover area, the 

 topographic contnd exercised by the Black Hand formation is 

 very important. 



The development of the Logan in this region is normal. Pro- 

 fessor Prosser has studied an exposure, which is typical, at the 

 Brick Plant (Fig. o).' This formation disintegrates evenly, 

 giving gentle slopes. 



No outcrop of Maxville limestone was found, nor was this for- 

 mation noted in the 25 square miles immediately north of Hanover 

 Township." 



The Sharon conglomerate caps nearly every hill reaching an 

 altitude of about 225 feet above the bench mark (Fig. ;5). Much 

 diversity in its structure is noted ; to this condition is due the fact 

 that we find in close proximity hills that vary 20 to 40 feet in al- 

 titude ; the regular extension of drainage disintegration would not 

 account for this discrepancy. 



With the above arrangement of rock horizons : a conglomerate 

 (Sharon, 250-feet) underlain by thin bedded sandy and shaly 

 layers (Logan, 115-feet) capping a conglomerate (Black Hand, 

 100-feet) which in turn overlies a shale formation (Cuyahoga), 

 we have a vertical succession that responds irregularly to stream 

 erosion. Furthermore with the horizontal variations character- 

 istic of the two coarse formations we find in the stratigraphy of 

 the Hanover area another factor that has l)een active in producing 

 its rather unusual rock topography. 



PECULIARITIES OF DISSECTION. 



The widest and apparently the oldest valley of this section is 

 the one now blocked across by the Hanover Dam. This valley is 

 explaini'cl as a "pregiacial"" west-tlowing drainage line, named 



1 C. S. Prosspr, Joiinial af (Iciilotjij. \n\. I X (I'.KM). ii 

 - F. (':iriii'.v, }i>f. <il.. p. IL'-J. 

 ^ K. I.cvcrcll, Inc. ril.. |i. 1."..".. 

 W. (;. Ti.i;lil, lot: cil.. \>. 47. 



