GREENE COUNTY. 679 
limited to the different representatives of the Cedarville division, but 
various limestones of the State are included. 
Percentage of 
: : : Specific 
Locality. Geological horizon. fi eae aan Ne avity. 
Greenville, Darke county .....) Top of Guelph, or Cedarville 50 2.452 
MCIIOWASPRINGS trees ercclseccserss Bottom of Guelph............... 43 2.605 
Greenfield, Highland county | Waterlime............... ...006 soe 42 - 2.648 
MellowsS prin gsieesseccotece esas: Clinton ec wnemen ln Minas 12 2.664 
Columbus oe elie COrmilerous er aanaevcecsscclcceess 30 ? 2.664 
Win Cima tin ecclcncenc see ek Cincimnatitesrscs sects: Gscosticeentess 5 2.700 
III. DRIFT. 
The Drift of Greene county agrees so closely in all particulars with 
that of the adjacent counties, already reported upon, that no extended 
description will be given in this place. All of the distinguishing fea- 
tures of this most interesting but perplexing formation are here shown 
with great distinctness. In other words, the materials for a perfect 
theory of the Drift are found spread over the rocky floor of Greene 
county. 
1. In the first place, the face of the Niagara limestone has been uni- 
versally planed and polished by glacier agency. It does not, it is true, 
show the marks of this agency every where, for the upper beds of the 
limestone have often been partially dissolved by the action of atmos- 
pheric waters infiltrating through the Drift beds; but wherever the sur- 
face has not been thus affected it. exhibits the glaciated markings now 
under consideration. These markings have been noted in every section 
of the county in which the cliff limestone is exposed; but they are 
shown most plainly in the uncovered surfaces of the Yellow Springs 
quarry and of McDonald’s quarry. The grooves and strie have a direc- 
tion in most instances of ten to fifteen degrees west of north. In the 
Yellow Springs quarry their line of direction cuts the line of direction 
of the Glen, which is immediately adjoining, at an angle of about twenty 
degrees, showing that even such deep furrows as this had no HNN in 
changing the course of the abrading ice-sheet. 
2. Over the polished surface of the rocks, as well as over those more 
extensive areas where the rocks retain no markings of this kind, lies, 
in deposits of varying thickness, a covering of bowlder clay. This is an 
