ST. JOHNS OR SALAMONIE MORAINE. 519 



the reservoir to the St. Marys River at Rockforcl, and also traced a channel 

 from Rockford southwest some distance into Indiana. The latter channel 

 passes under the Salamonie moraine near Camden. The rock floor of these 

 channels is 400 to 500 feet below the present surface, or not far from 500 

 feet above tide. The bluffs rise to within 50 to 100 feet of the ]) resent 

 surface. 



The following- well data, collected by the writer, serve to indicate the 

 variability in thickness of the di-ift. At William Schroer's, about 1^ miles 

 northwest of New Knoxville, a gas well penetrated about 400 feet of drift, 

 but a well at Mrs. Hannan Schi'oer's, one-half mile nearer the village, pene- 

 trated only 280 feet, while wells north of William Schroer's penetrated 

 scarcely 100 feet of drift. Three miles west of New Knoxville a gas well 

 known as the "Hoewischer" well penetrated about 400 feet of drift, and a 

 well at the east end of the Grand Reservoir penetrated 407 feet. Other 

 wells at the east end of the reservoir show a smaller amount of drift, though 

 one was reported to have penetrated about 350 feet. At the west end of the 

 reservoir, near Monteziuna, on Thomas McGee's land, a gas well shows 

 about 400 feet of drift, and one a mile or so east of this well shows about 

 300 feet. Other wells are found within one-half to three-fourths of a mile 

 from these which penetrated but 60 to 100 feet of drift. On the plain 

 south of the Salamonie moraine, near the great cranberry marsh in southern 

 Mercer County, a gas well penetrated 175 feet of drift. At Fort Recovery, 

 also on the outer border plain, a gas well penetrated 145 feet of drift. 



A well near Portland in sec. 18, T. 23, R. 16 E., Jay County, Ind., 

 strikes rock at 83 feet after penetrating the following beds: 



Drift in well near Portland, Ind. 



Feet. 



Yellow till 15 



Thin beds of sand ■. 2-3 



Blue till 65 



A well 1 mile east, in section 17, penetrated 160 feet of drift, the log 

 of which was not obtained. Another, a mile farther east and about a mile 

 north of Bellefontaine, Ind., strikes rock at 80 feet. In these three wells 

 the surface elevation differs but little. A well in the southwest j^art of 

 section 7 of the same township strikes rock at 57 feet and penetrates till 

 the whole depth of the drift. In the SE. ^ of sec. 35, T. 24, R. 14 E., the 

 drift has a thickness of 135 feet and is mainly till, there being a thin bed 



