532 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



northwest bluff of Whetstone Creek, and joins the Powell moraine just 

 north of Mount Gilead. 



The portion west of the Scioto is sharply outlined and has a breadth 

 of about a mile. That east of the Scioto is less distinctly outlined and 

 somewhat broader. 



RANGE IN ALTITUDE. 



The altitude near the Scioto and Olentangy rivers is about 900 feet, 

 while on the borders of the Scioto Basin it is 1,150 feet or more. As in 

 the Powell moraine, no rapid changes in altitude occur, but there is a 

 gradual rise from the center to the borders of the basin. 



RELIEF. 



West of Broadway the moraine for several miles follows the north side 

 of Mill Creek and stands 25 to 35 feet above the flood plain. Between 

 Broadway and Marysville it leaves the creek and has a well-defined and 

 rather abrupt outer border relief of about 20 feet. East of Marysville 

 it follows the north side of Blues Creek for a few miles, and its relief is 

 perhaps 20 feet, though it is difficult to determine on account of erosion 

 along' the valley. From Ostrander eastward to the Scioto the moraine 

 for a few miles is not followed by a stream, and here it rises abruptly 20 

 feet or more above the plain south of it. Between the Scioto and Olen- 

 tangy it is broken up into ridges and knolls which rise 12 to 20 feet above 

 the nearly plane tracts south of them. Between the Olentangy River and 

 Alum Creek, in the vicinity of the Big Four Railroad, the outer border 

 relief is quite abrupt and is in places fully 20 feet. The railroad enters 

 the morahie a mile or so south of Eden Station in a cutting 8 or 10 feet 

 deep. Farther east, where the moraine follows Alum Creek the erosion has 

 made it difficult to determine the relief. 



In the inner member, which follows the northwest bluff of Whetstone 

 Creek, the moraine is not a well-defined ridge, but consists of low "clay 

 points" somewhat closely associated, that rise but a few feet above the 

 bordering plains. 



TOPOGRAPHY. 



At the headwaters of the Scioto and Oreat Miami rivers in south- 

 western Hardin County, in the united belt, we find the morainic expression 

 somewhat variable. Near Roundhead there are several sharp knolls 30 or 



