154 The Ohio Journal of Science [Vol. XVI, No. 4, 



generally flinty in character, weather white, and are fossili- 

 ferous. This description will apply to all the cobble beds 

 except in point of size. 



The most northerly beds found occur about 5 miles south 

 of Glenmont in Holmes County, where the surface in places 

 is strewn with cobbles. At one point on top of a ridge, besides 

 the cobbles the soil is all a rich chocolate color. The area 

 is an acre or two in extent and is the residue of the 

 fully weathered limestone. 



It is now known that the Maxville is found two-thirds of 

 the distance across the state with strong probability of still 

 further extent formerly. 



Taking the Berea sandstone as a datum plane in the general 

 direction of the Maxville outcrop, it is found that the Berea- 

 Maxville interval increases northward. In Vinton County 

 the interval between the top of the Berea and the top of the 

 Maxville is about 650 feet; at Rushville, in eastern Fairfield 

 County, about 800 feet; at New Castle, in Coshocton County, 

 840 feet; near Killbuck in southern Holmes County, 870 feet; 

 and 20 miles north of the last point in central Wayne County 

 east of Wooster, 900 feet of shale and sandstone above the' 

 Berea does not quite reach the Maxville horizon. Northward 

 from Wayne County the total thickness of the Mississippian 

 strata decreases notably, due to greater erosion in late Missis- 

 sippian time. In north-eastern Ohio the Pennsylvanian beds 

 lie, commonly, only about 3 to 4 hundred feet above the Berea, 

 and in the old Mississippian river valleys, clearly defined in 

 this area, the Sharon Conglomerate sometimes lies but 100 feet 

 above the Berea. 



If the plane of the Maxville be projected northward to 

 Cleveland with the slowly increasing interval between it 

 and the Berea, the Maxville would lie about 1050 feet above 

 the Berea. 



In the light of these facts it is apparent that the Maxville 

 can not be found in northern Ohio, and that outcrops may not 

 be expected beyond northern Holmes, or central Wayne County. 



It will be noted further that these figures reveal the inter- 

 esting fact that the Mississippian System thickens northward, 

 although thinest in the northern part of the state now, as a 

 result of greater erosion. 



Mt. Union College, Alliance, Ohio. 



