MORROW COUNTY. 267 



in the valleys of those streams that flow southward from the watershed 

 there is a steady increase in the amount of exposure of the underlying 

 rock, until the banks become constantly rocky, and at last show sixty to 

 a hundred feet excavation in the solid rock. This increasing erosion 

 of the rocks in the valleys of the southward-flowing streams, in passing 

 southward, is noticeable even within the limits of Morrow county. In 

 the township of Canaan the black slate is not exposed at all, and in 

 Tully township, Marion county, it is only exposed at two or three points, 

 although crossed by streams in both townships. In Crawford county, 

 which lies immediately north of Morrow, there is not a single exposure 

 of the black slate, although it is crossed repeatedly by the largest streams 

 of the county. On the contrary, in the southern part of Morrow county, 

 the banks of Alum Creek afford almost a constant exposure of the black 

 slate, and some of the small tributary valleys, that are dry except in 

 the freshet season of the year, are also deeply dug in the same formation. 

 Prom this the conclusion is inevitable that whatever the force or forces 

 that deposited the Drift in Ohio, they operated latest toward the north- 

 west. As there is no essential difference in the composition and arrange- 

 ment of the Drift toward the south, it is necessary to infer either that 

 the cause of the Drift was one of great duration, or that it has recurred 

 in full force in the north-western part of the State since its withdrawal 

 from the central part. The same kind of force must be applied to both 

 localities. 



Glacial marks were seen at a single locality in Morrow county. They 

 were noted on fragments removed by the quarrymen at the quarry of Mr. 

 David Steiner, three and a half miles south-east of Cardington ; but their 

 direction could not be ascertained. 



Wells and Springs. — In the eastern half of the county there is no diffi- 

 culty in obtaining water for the household and for dairy purposes. The 

 sandstone underlying is apt itself to give a ferruginous character to the 

 springs that issue from it ; but the most of the springs and wells that 

 give an irony taste derive the iron, as a carbonate, from the Drift gravels 

 and sands with which that part of the county is well supplied. That 

 kind of water is very often met with in the eastern part of the county. 

 In the western half of the county the water of wells and springs is very 

 often sulphurous. Some very strong sulphur springs occur in that part 

 of the county, issuing directly from the black slate. Some very remark- 

 able and copious sulphur springs occur in Peru township. The following 

 list, with the adjoined columns, will convey a very good idea both of the 

 thickness of the Drift and of the nature of well water obtained in differ- 

 ent parts of the county : 



