PUTNAM COUNTY. 391 
At Ottoville, in the Little Auglaize, S. E. + section 24, Monterey town- 
ship, the Waterlime presents a surface exposure. 
In the Blanchard River the rock often shows in Blanchard township. 
It was noted particularly at a point three miles west of Gilboa, on land 
of Mr. George Harding; also,'S. E. } section 29, on Samuel Kline’s land.. 
It also appears on sections 27 and 28, land of O. W. Crawfis. 
Occasionally, in the southern portion of the county, the Waterlime 
rises in gentle undulations, which are observable through the Drift. In 
such cases the rock is sometimes visible, and has been quarried. These 
undulations are not conspicuous enough to be known as “limestone 
ridges.” Indeed, the rock is sometimes encountered in ditching in low, 
flat ground, where no change in the general level is observable. The 
rock is exposed in this manner on the land of N. W. Ogan, section 35, 
Pleasant township; also, S. W. 4+ section 36, on the land of D. Strow, in 
the same township; also, in sections 8, 17, and 16, Sugar Creek township, 
land of Jacob Rhodes. 
The Drift in Putnam county, as in Hancock, seems to be thicker north 
of the Blanchard than south of it. The frequent exposure of the rock 
along the streams flowing northward in the southern portion of the 
county indicates that their channels are eroded as deeply in the Drift 
| deposit as the inequalities in the rocky surface will permit. The aver- 
age height of their banks will not exceed twenty feet; and twenty-five 
feet will probably exceed rather than fall short of the average thickness 
of the Drift. North of the Blanchard the average depth in the Drift of 
thirty wells reported by the County Surveyor, L. HE. Holtz, of Ottawa, 
many of which did not strike the rock, is sixty-four feet. He gives but 
two south of the Blanchard, both of which are twenty-two feet, one being 
artesian. : 
The materials of the Drift are rarely assorted or stratified, the great 
mass of it being a typichl glacial hard-pan. Bowlders of all sizes are 
disseminated promiscuously through it. Itis generally quite impervious 
to water, and sometimes artesian wells rise from the bed of sand and 
gravel which usually intervenes between it and the rock. - Although 
the mass is unassorted, the ridges and knolls which occur in the north- 
eastern part of the county, as well as the Van Wert Ridge, which crosses 
the south-eastern corner, passing through Webster, Pendleton, Columbus 
Grove, and Vaughansville, consist largely of assorted materials, usually 
of gravel and sand, in oblique stratification. Bowlders are very rarely 
seen in the county, except in the drainage valleys, where they have been 
washed out of the Drift. On the S. E. 4 section 21, Jackson township, a 
large Corniferous bowlder lies in the channel of the river, having a 
