102 



PLEISTOCENE OP INDIANA AND MICHIGAN. 



Northwest of Oakland, along Fall Creek, several gas wells penetrated partly till and partly 

 assorted material, as follows : 



Altitude and thickness of drift in wells. 



Opposite these wells the drift is much thinner north of Fall Creek than it is south of the 

 stream, not only because the drift surface is lower but because the rock surface is higher. In 

 a well at Cumberland about 50 feet of yellow and blue till overlies alternate beds of assorted 

 material and till. 



The Indianapolis gas companies have bored many wells in Marion County along White 

 River above Broad Ripple, and have found thicknesses of drift ranging from 50 to 90 feet. 

 The least thickness found is at Broad Ripple; the greatest is west of Allisonville. About a mile 

 east of AUisonville on the uplands, at an altitude of 75 feet or more above White River, a well 

 penetrated only 78 feet of drift. 



In Indianapolis, on the gravel plain along White River, 35 to 60 feet or more of assorted 

 material overlies a blue till. Several wells 1 ranging in depth from 67 to 88 feet show a gravel 

 stratum 38 to 61 feet thick. Several gas borings in the city, some on the gravel plain and some 

 on the till tract east of the gravel plain, show drift varying in thickness from 80 to 118 feet. It 

 is thinnest on the till tract, though the altitude there is 20 feet or more greater than on the 

 gravel plain, and is thickest in the valley of Fall Creek near North Indianapolis, on low bot- 

 tom land about 20 feet below the Union Depot (688 feet above sea level), where it is 118 feet 

 thick. 



Along White River, between Broad Ripple and Indianapolis, are some fine exposures of 

 blue till. The bluffs are in places 60 feet high and show scarcely any gravel outcrops. Though 

 fines of deposition or lamination have been noted 2 in this blue till, it is very pebbly, and may not 

 differ greatly in origin from tills in which no lamination is observed. 



Hamilton County. — A gas well at Carmel, in Hamilton County, in a valley near the depot, 

 penetrated 96 feet of drift. A half mile east of this well, on ground some 30 feet higher, a well 

 passed through 62 feet of till, beneath which was sand to the bottom of the well at 135 feet. 



One of the gas wells in Westfield struck rock at 196 feet, the other at 220 feet; in both the 

 drift is mainly a blue till. A gas-yielding well in a valley about 3 miles southeast of Westfield 

 penetrated 95 feet of drift, of which the upper 20 feet is till and the remainder sand and gravel. 



Gas wells at Jolietville and Eagletown, in western Hamilton County, each passed through, 

 about 200 feet of drift, mainly till. In the Eagletown well a bed of quicksand 20 feet thick 

 near the bottom of the drift caused much difficulty in completing the boring. 



Boone County. — At a sawmill in Royalton, in the Fishback Valley, some 60 feet below the 

 level of the upland, a well about 100 feet deep penetrated mainly blue till, the only gravel encoun- 

 tered being a 5-foot bed about 25 feet from the surface. 



A gas well 4J miles northeast from Lebanon penetrated 285 feet of drift. Its section is 

 said to differ from that of the gas well in Lebanon (p. 99) in containing less of the hard and dry 

 ash-colored clay near the bottom. 



i Twelfth Ann. Rept. Indiana Dept. Geology and Nat. Hist., 1883, pp. 92-93. * Idem, p. 93. 



