DARKE COUNTY. <0) OO, 
them in the north-western part of the county, along the summit of the 
watershed, where they have been dropped by the stranded icebergs. 
The watershed at that time formed the southernmost shore of the Lake. 
Next we find them following the channels of the principal streams, 
marking out the line of deepest channels, which the icebergs naturally 
sought in their southern progress, after forcing a passage through the 
breaks and gaps of the divide. Greenville, Bridge, Mud, and Stillwater 
Creeks all seem to have afforded such avenues, but especially the first. 
At Bierley’s quarries, however, and in that vicinity, resting just above 
the Niagara limestone, in probably a foot or two of soil, they exist In a 
- perfect jumble, sometimes two and three huge ones piled up together. 
Up stream they can be traced as a perfect moraine; below, however, 
they are few, though for the most part larger. The beds of Niagara 
rock here must evidently have presented an impassible barrier to the 
floating icebergs in their passage down the valley of the creek. Similar 
collections of these large bowlders, though not quite so numerous, imme- 
diately overlie the limestone at Weaver’s, New Madison, Gard’s, and, in 
fact, all the exposures in this county, showing that there is some truth 
in the common saying of quarrymen, that where these groups of bowl- 
ders are found lying upon the surface of the soil, limestone is likely to 
be found at a small depth beneath—observing a fact that is frequently 
true in this region, though not ascending to the cause; the most plausible 
explanation of which seems to be, that the quarries rom the simple 
fact of their exposure) are generally the most elevated portions of the 
underlying rock, and hence stood in the same relation to floating ice 
that snags and sand-bars do to ships. 
An outer belt of these iceberg moraines can easily be traced up the 
ereek from Bierley’s quarries, following the left bank, then in less than 
a quarter of a mile it crosses to the right, until arriving at the farm of 
H. ©. Kerr, where it leaves the creek, pursuing a diagonal course over 
the land included in the bend of the creek, it again meets it and 
crosses Over, passing south-west of the residence of Josiah Kerr. It then 
crosses the Greenville and Gettysburg pike, following the north side of 
‘the road, until at or near the residence of D. and M. Craig it makes a 
circuit into the neighboring fields of Messrs. Dun,Kerr, and Green walt, and 
‘again strikes the creek a little below Knouf’s Mill, where the bowlders 
have been utilized in the construction of a largedam. From here this mor- 
aine might be traced almost indefinitely toward the divide or watershed 
along and about the region of the creek, showing, as indicated that 
though the former course of the stream differed to a considerable extent 
locally, its general direction was that of the river valley or basin. This 
