MORROW COUNTY. ; 267 
in the valleys of those streams that flow southward from the watershed 
there is a steady inerease 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. 
From this the conclusion is inevitable that whatever tlie force or forces 
that deposited the Drift in Ohio, they operated latest toyard 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 : 
