100 PLEISTOCENE OF INDIANA AND MICHIGAN. 



Section of well on Washington 'Street, Lebanon, Ind. 



Feet. 



Soil 7 



Sand, yellow - 1 



Clay, yellow 3 



Sand, bluish, and clay 1 



Sand 4 



Clay, blue 3 



Sand and gravel - 4 



Clay, blue - - 2 



Clay, gray 3 



Hardpan (indurated clay) - 4 



Clay, blue, laminated 14 



Clay, gray 3 



Sand and clay 10 



Clay, blue. - - 23 



Gravel, coarse ■ 1 



Clay, blue 25 



108 



At Zionsville, in the southeast part of Boone County, a gas boring entered yellow till under 

 blue till at a depth of S8 feet, and the transit may mark the passage from the Wisconsin to 

 the Illinoian till, though its low altitude rather favors the view that it is in the midst of pre- 

 Wisconsin drift. The well is in the valley of Eagle Creek and may start at a level as low as 

 the base of the Wisconsin. The following is its section: 



Section of drift in gas boring at Zionsville, Ind. 



Feet. 



Sand and gravel, with a little clay. 30 



Gravel, coarse 8 



Till, blue ' - • - • ±50 



Till, yellow and blue, in alternate beds; containing pieces of wood ±60 



Bowlder, large 7 



Clay, yellow 10 



165 



At Sheridan, in western Hamilton County, a bed of red clay near the base of the drift may 

 prove to be a preglacial residuary clay of exceptional thickness. The driller, Mr. Holleran, 

 of Noblesville, noted in it decomposed pieces of white rock such as appear in residuary clay 

 in some limestone regions. The well was largely through blue till for 150 feet, through sand 

 and gravel for 40 feet more, and through 43 feet of red clay resting on limestone at 233 feet. 



Another well, on the Maudlin farm, 3 miles west of Newcastle, shows 243 feet of reddish clay 

 underlying about 60 feet of ordinary yellow and blue till. Eock was struck at 303 feet. All 

 the Wisconsin drift may be included in this 60 feet of till. 



THICKNESS OF THE DRIFT. 



Few well records indicate or suggest the depth of the Wisconsin drift along the belt, but 

 a number throw light either on its thickness or its structure. These are noted below in order 

 from the Ohio-Indiana hue westward. 



Randolph County. — At Lynn two gas-well borings, each beginning at an altitude about 

 the same as the railroad crossing (1,162 feet), penetrate one 117 feet and the other 124 feet 

 of drift. In each the upper 50 feet is till and the remainder mostly assorted material. 



In the eastern part of Winchester a gas boring passed, principally through till, to 160 feet, 

 at which depth a bowlder was struck and the boring abandoned. West of Winchester 1£ 

 miles a gas well penetrated 333 feet of drift, some of which is till and a large part sand. Several 

 gas wells in the vicinity of Winchester strike rock at depths of 80 to 100 feet after penetrating 

 more till than assorted material. A water well at Fountain Park Cemetery, in Winchester, 



