282 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



The following section was obtained in the southwest part of Madison- 

 ville, where a street (Columbia avenue) has been graded down: 



Section on Columbia avenue in Madisonville^ Ohio. 



Feet. 



1. Clay or silt, nearly free from pebbles, color light brown 3-4 



2. Pebbly clay of dark-brown color, slight traces of bedding, with crumpling and disturbance. . . 4-6 



3. Brown till with blue streaks -r- 4 



4. Gravel and sand in horizontal beds, exposed 7-8 



Total - - - - 20-22 



A short distance west the same street grade shows a change in the till 

 (No. 3) to a fine laminated clay, while the underlying bed becomes 

 disturbed. 



Just north of Batavia Junction, where this lowland tract opens into the 

 Little Miami Valley, there is a bluff rising to a height of 80 feet above 

 the station or about 140 feet above the Ohio. The following beds are 



exposed : 



Section near Batavia Jimction., Ohio. 



Feet. 



1. Sandy surface deposits 5-10 



2. Yellow clay containing blocks of local limestone 15-20 



3. Fine sand - 15 



4. Gravel, medium to coarse - - - 40 



It seems not improbable that the gravel beds here exposed extend north 

 into Madisonville, there being nothing in the topography to oppose this view 

 and the distance being only a mile. A short distance west of Batavia 

 Junction the Wisconsin gravel appears in the form of terraces along the face 

 of the bluff, the upper terrace being about 40 feet below the level of the 

 border of the lowland tract under discussion. 



Calcareous nodules were observed at many points in this lowland tract 

 in connection with the silts which underlie or replace the till, but they are 

 not common here or elsewhere in connection with the silt that overlies the 

 till and forms the surface of the uplands and are seldom found in the till 

 itself An exposure was noted, however, just east of the gate of the 

 Zoological Garden and near the top of the north slope of the Walnut Hills 

 Ridge, where nodules appear in a pebbly clay just below the silt, the 

 section exposed being: 



Section near Zoological Garden in Cincinnati, Ohio. 



Feet. 



1. Silt of pale yellow color 4 



2. Clay containing few pebbles, but thickly set with calcareous nodules 2 



3. Ordinary yellow till, exposed 6-8 



