WAVERLY GROUP. 97 



Sandstone. no ft. 



Strong brine. 



Gray shale 20 " 



Limestone 2 " 



Total 1764 ft. 



Further south, at Flint, a boring of 1200 feet was made a num- 

 ber of years ago, concerning which Dr. Clark gives me the follow- 

 ing general information : 



Drift 68 ft. 



Sandstone 6^ " 



Shales and sandstone, with seams of coal... . 35 " 



Sandstone 108 " 



From the depth of 260 feet a strong stream of sweet water rose 

 to the surface. From there to a depth of 1200 feet, alternations of 

 shale and sandstone occurred, and in the lower portion of the drill- 

 hole a strong salt brine was found. 



At Flint, several other deep borings were made through the coal 

 measures into the Waverly group, but in none of them could the 

 existence in that locality of the subcarboniferous limestone series 

 be ascertained, A boring made in Section 5 of the town of Owos- 

 so, in Shiawassee County, is reported to me by Mr. Courier, of 

 that place, as follows : 



Drift 121 ft. 



Shale 20 " 



Coal 4 " 



Shale 54 " 



Hard rock 15 " 



Shale , . . 33 " 



Sand rock 220 " 



Limestone 3 " 



Shale 64 " ' 



Limestone 3 " 



Soft shale 20 " 



Sandstone with brine yy " 



after which were blue and red shales to the depth of 1000 feet 

 below the surface. 

 7 



