INNER BORDER OF THE SCIOTO LOBE. 427 



of importance toward the north is Baker Hill, on the Groveport pike, 3 

 miles southeast of Columbus. This rises abruptl)^ about 50 feet above the 

 bordering plain. Its highest jjoint, as shown b}' the East Columbus topo- 

 graphic sheet, is 819 feet Orton once mentioned to the writer that he had 

 noted CAddences of disturbed stratification in it, some of the beds being 

 crumpled and contorted as if by a shove from the ice sheet. 



There are no knolls near this hill toward the north, but about 7 miles 

 east of Columbus, in the east bluff of Walnut Creek, a chain of knolls and 

 ridges sets in which is maintained with slight interruptions from there 

 northward for 8 or 9 miles, and possibly may find a continuation in sharp 

 knolls of the same type that lie along the west border of the main moraine 

 from near Hartford northward several miles. The tract east of Columbus 

 includes a sharp knoll at the south, 40 feet or more in height, standing 

 by itself, a short distance north of which a sharp ridge in form somewhat 

 like an esker sets in, which is quite distinct for a mile or more. It is 10 to 

 20 feet high, and but a few rods wide. It contains much assorted material, 

 but has a slight capping of till, and its surface is' liberally strewn with 

 bowlders, features which, taken in connection with its trend, indicate that 

 it is a frontal ridge of morainic character rather than an esker. Between . 

 this point and New Albany, which is 8 miles north, a few sharj) knolls 

 20 to 25 feet high, and many lower knolls occur, forming a nearly contin- 

 uous belt. No knolls of this class were found on a line east from Sunbury 

 to Hartford and noi'thward from that line. 



Since the belt does not appear to have a northward continuation from 

 New Albany distinct from the main moraine, there is a probability that it 

 became blended with that moraine. As noted above, there are, from the 

 latitude of Hartford northward for many miles along the west borders of 

 the main moraine, sharp gravelly knolls and ridges, similar to those near 

 Columbus, while the remainder of the moraine is nearly free from such 

 knolls. Quite often some dependence may be placed upon structure in 

 tracing moraines; thus one moraine may be characterized by numerous 

 gravel knolls, while the one next to it in the series may be nearly free from 

 them. While it may not be safe to conclude from this class of evidence 

 that the gravelly knolls in the main moraine are contemporaneous Avith 

 those in the inner border district and markedly later than the remainder of 

 tlie moraine, such a tentative classification seems legitimate. 



