298 GEOLOGY OF OHIO. 



ridges the timber is largely beech ; on the lower land, oak, elm, black 

 oak, etc. 



The surface Drift in other parts of the county presents a great variety 

 of features, a few of which may be briefly noticed. In Peru township 

 the bed of Huron river is about one hundred and thirty feet above the 

 Lake, the blufis generally composed of modified Drift — a gravelly clay 

 loam, with the debris of limestone rocks abundant. These bluffs rise to 

 the height of from one hundred and eighty to two hundred feet above the 

 Lake, and are much modified by surface erosion. Receding from the river, 

 the surface rises to two hundred and twenty feet above the Lake, being 

 undulating, much eroded and presenting no appearance of a water plain; 

 soil rich in lime and humus. 



At Greenfield Center the barometer marked an elevation of two hun- 

 dred and ninety feet above the Lake. The surface of most of the town- 

 ship is covered with irregular undulating hills of gravel and Drift. 



The following is a section of the Drift banks of the branch of Huron 

 River, west of Steuben : 



pr. 



1. Modified Drift, composed of stratified sand and clay, with debris of 



grante, limestone, and local rockj 25 



2. Gravel , 5 to 6 



3. Blue boulder clay, unstratified 12 



Westward the surface is a broad table land, rising to the height of 

 three hundred and forty feet above the Lake, with irregular valleys of 

 erosion, and continuing to the west line of the county. The rock forma- 

 tion is deeply buried under the Drift. 



Near the center of Townsend township, the following section of the 

 Drift is disclosed in sinking wells : 



FT. 



1. Soil 2 to 3 



2. Boulderclay 4 to 12 



3. Laminated clay with thin layers of gravel 2 to 6 



4. Coarse water-hearing gravel, the thickness of which is not ordina- 

 • rily ascertained. 



The lowest stratum yields an abundant supply of excellent water, 

 which in places rises to the surface and flows in a stea,dy stream from the 

 mouth of the wells. Water obtained above this horizon is of poor quali- 

 ty, rendered impure by the minerals contained in the Huron shales, the 

 debris of which are largely mingled with the Drift. 



In Greenwich township the north and south center road, south of the 

 Cleveland, Columbus, Cincinnati and Indianapolis Railroad, passes over 

 level clay lands at an altitude of four hundred and eighty -five feet above 

 the Lake, presenting the appearance of a broad water-plain, and resem- 



