DAEKE COUNTY. 507 



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 quarftes (from 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 

 creek 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. C. 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 Gieenwalt, and 

 again strikes the creek a little below Knouf's Mill, where the bowlders 

 have been utilized in the construction of a large dam. From here this mor- 

 aine might be traced almost indefinitely toward the divide or watprshed 

 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 



