BURIED STREAM CHANNELS AT THE BASE OF THE PENN- 

 SYLVANIAN SYSTEM IN SOUTHEASTERN OHIO.^ 



C. R. SCHROYER. 



Contents : 



Introduction, 



Description of the contact at the north, 



Description of channels, 



Channel south of Logan, 



Channel south of Beyer, 



Evidences of a continuous system. 



Numerous and marked irregularities are present at the top 

 of the Mississippi an strata in Ohio. Professor C. F. Lamb finds 

 the surface a series of north-south ridges with alternating depres- 

 sions in northeastern Ohio.- Dr. J. J. Stevenson, collecting the 

 scattered evidence for a wider area has interpreted this surface as 

 the effect of a wide spread subserial erosion.^ 



It seems worth while to add some observations made in south- 

 eastern Ohio. Over wide areas the contact is very regular; so 

 much so that, were it not for the general difference of the strata 

 above from that below, it might be taken for a bedding plane. 

 Minor irregularities do occur but only by careful search and com- 

 parison of elevations can evidence be found of a time break as 

 long as this one appears to have been. 



THE CONTACT A LEVEL PLANE AT THE NORTH. 



The contact between these two systems is almost a level plane 

 from Newark to Logan, crossing Licking, Perry, and Fairfield 

 Counties. The regularity may be inferred from the fact that in 

 an east-west section of twenty-two miles extending west from White 

 Cottage past Mt. Perry, the base of the Pennsylvanian strata 

 lowers 420 feet to the east and in the twenty-two exposures studied 

 not a single one shows a counter dip. Another section along the 

 National Road from Amsterdam on the west to Gratiot at the east 

 shows a regular eastward inclination of about 19 feet to the mile. 

 If this be extended eastward to where the Waverly goes under 

 in the Licking River at Dillon, it gives a relief of 400 feet in 1S>^ 

 miles or 21.6 feet to the mile. This inclination approaches the 

 reported dip of the bed rock. 



1. Published by permission of the Director of the Ohio Geological 

 Survey. 



Partial abstract of the material offered as a Master's thesis at 

 Ohio State University. 



2. lour, of Geol., Vol. 19, p. 104, 1911. 



3. Bull. Geol. Soc. of America. Papers in Vol's. 14, 15, 17, and 18. 



519 



