314 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



Dr. Moses furnished the following section of the drift in the tannery 

 well, but of the others no record of di-ift structure was kept: 



Section of drift in the tannery tmll at Urbana. 



Feet. 



Soil, subsoil, etc - - 10 



Gravel and sand 35 



Blue clay ( pebbly ) 25 



Sand and coarse gravel 10 



Fine gray clay 35 



Coarse gravel mixed with clay 15 



Blue boAvlder clay 25 



Depth to limestone 150 



At present there appears to be no means of determining how much of 

 the above section is referal^le to the Wisconsin drift. Foiir miles north of 

 Urbana, on the north side of Kings Creek and on the moraine, is a well on 

 Greorge Creffield's farm which penetrated 103 feet of till and obtained water 

 from a gravel bed at the bottom. At a farm house 40 rods east of Cref- 

 field's is a well 93 feet deep which did not reach rock. 



In the southern part of Urbana, near the waterworks and west of the 

 Erie Railway, a gravel pit is opened in a knoll to a depth of about 30 

 feet. It lias dejjosits of till at the top and the south end, but the body of 

 the knoll consists of gravel and cobble in which large limestone slabs are 

 included. The stones are nearly all limestone, the Archean rocks consti- 

 tuting scarcely 1 per cent. A few fragments of shale were observed which 

 appear to have been derived from Devonian strata. 



The sections just given from the vicinity of Urbana rejiresent no more 

 variety than is commonly displayed in the wells and exposures in this dis- 

 trict. In the northern part of Springfield are several good exposures of 

 the drift structure wliich are found to show both till and gravel in a single 

 knoll. The most extensive one is on the north side of Buck Creek, just 

 east of the Cincinnati, Sandusky and Cleveland Railway. Its length is 100 

 to 125 yards and its depth 15 to 25 feet. The western half is composed 

 of yellow till, exposed to a depth of 15 feet, containing a few thin layers of 

 sand horizontally bedded. The eastern half shows a curious alternation 

 of assorted and unassorted material. The bedding, so far as traceable, is 

 mainly horizontal, but near the top are beds which have a dip of 20° 

 to 30°. In the portions where bedding is not distinct there is a mixture 

 of flinty material of all sizes from small pebbles up to bowlders 3 feet in 

 diameter. 



