THE LAKE-BOEDER MORAINIO SYSTEM. 397 



bles, which extends to a depth of about 50 feet, where water-bearing sand 

 is entered. 



At the Blair artesian well, in the northeast corner of Porter County, 

 240 feet of drift was penetrated if the surface sand be included. The well 

 is located on low ground near the lake, only 15 or 20 feet above the lake 

 level. The rock surface is, therefore, nearly 225 feet below the lake level. 

 The following notes concerning the well were furnished by Mr. John Orr, 

 of Michigan City: 



Section of Blair artesian well in Porter Comity, Indiana. 



Feet. 



1. Surface sand 18 



2. Alternate layers of peaty blue clay and fine sand 12 



3. Soft blue clay, slightly pebbly, with tkin beds of gravel included 55 



4. Water-bearing gravel bed 2 



5. Fine sand 5 



6. Water-bearing gravel 2 



7. Blue clay harder tban "No. 3," apparently a typical till 106 



8. Water-bearing gravel 5 



9. Blue clay alternating with beds of fine sand 35 



10. Tbin layer of shale -- ? 



11. Gray limestone 180 



12. Soft caving rock, probably shale 30 



13. Limestone 6 



14. Soft caving rock, probably shale 30 



15. Hard limestone 370 



16. Hard blue rock 2 



Total depth 858 



A flow of water began at a depth of 68 feet and was greatly increased 

 at about 200 feet. At a depth of 370 feet the water became impregnated 

 with sulphureted hydrogen and the flow was increased. The rate of flow 

 is about 400 barrels per hour. 



In Michigan City a prospect boring for natural gas obtained only a 

 strong flow of water. The first flow was from the glacial drift at a depth 

 of 210 feet. Water containing sulphureted hydrogen was struck at about 

 450 feet. The section (furnished by G. C. Marsh) differs somewhat from 

 that at the Blair well, as follows: 



Section of boring at Michigan City, Indiana. 



Feet. 



Dry surface sand I 5 



Quicksand 1" 



Gravel ° 



Blue clay, slightly pebbly 145 



Very pebbly blue clay 22 



Cobble, bowlders, and gravel I 5 



Gravel and sand with an occasional bowlder 10 



Limestone and shale as in previous section. 



