GENERAL FEATURES OF ILLINOIAN DRIFT SHEET. 283 



Sections of several wells along Mill Creek Valley are given in the 

 discussion of the early Wisconsin drift (Chapter X). The greater part of 

 the drift is probably Illinoian, as appears in that discussion. 



The portion of the Illinoian drift sheet covering southeastern Indiana 

 was the subject of only a hasty reconnaissance by the writer, and very few 

 detailed sections can be furnished. Numerous exposures were found in 

 which yellow till extends to the rock, the distance to rock on uplands being 

 generally 20 feet or less. Well sections published in the Indiana reports, 

 which throw light upon the deeper parts of the drift are here reproduced : 



Section of Van Osdel loell ifi Ohio County, Ind. {sec. 6, T. 3, R. ^ W.). 



Feet. 



1. Soil and clay 22 



2. Yellow sand, quite hard or cemented 9 



3. Blue clay, hard, without pebbles 1 J 



4. Black soil containing rotten leaves, twigs, and wood, thought to be walnut. . : li 



5. Coarse sand, gravel, and shelly stone 9 



6. Hard, blue limestone 1 



Total 44 



Section of Garden toell in northwest Switzerland Ooitnty {sec. J/., T. 5, R. 12 E.). 



Feet. 



1. Soil and clay, pale in lower part 22 



2. Blue mud resembling recent alluvium 6 



3. Black soil containing leaves, cedar wood, and ocherous particles 3 



4. Small stones closely packed together 1 



Total 32 



Wells in that vicinity often enter rock at 10 to 14 feet, but a neighboring 

 well struck leaves and poplar bark at 32 feet. It is thought that the bottom 

 bed in the Gordon well is native rock. In the vicinity of Paris Crossing, 

 in the extreme southern part of Jennings County, buried timber is often 

 found in digging wells on land 60 to 70 feet above the bed of Graham Creek. 

 From one well, simk by Mr. John F. Files, it is estimated that at least a half 

 cord of wood was taken, at a depth of 32 to 40 feet. The wood appeared 

 to be birch, and specimens were sent to the State museum. The wood was 

 much crushed and twisted, but it was found suitable for fuel, and was made 

 use of by Mr. Files. The following is the section of the beds penetrated : 

 Section of Files loell, near Paris Crossing, southern Jennings County. 



Feet. 



1. Light-colored clay with darker shades below 10 



2. Ocher-colored clay with flint pebbles, increasing in hardness toward the bottom 19 



3. Very hard bed of clay and gravel 2-3 



4. Sandy blue clay with water; also limbs, twigs, and roots of trees 7-10 



Total - 38-42 



