124 LOWER PENINSULA. 



Mr. Walker records of a boring made a short "distance north of 

 his coal mine, near the pottery works, the following series of rock 

 beds in descending order: 



Sandstone 20 ft. 



Sandy fire-clay 2 " 



Hard shale 2 " 



Hard sandstone 2 " 



Soft greenish shale 2 '' 



Sand rock, hard 6 in. 



Green shale 2 " 



Sandstone, hard 8 *' 



Sandstone and shale 2 " 



Black shale 3 " 



Gray fire-clay 5 " 



Bluish fire-clay 7 '' 



Cherty sandstone 3 " 



Black shale 7 " 



Coal, hard 8 in. 



Coal, soft 3 ''6 " 



Fire-clay, black and white 8 "6 " 



Gray chert rock 2 "6 " 



Fire-clay 9 " i " 



Black shale and chert 10 " 6 " 



Brown shales with kidney ore 11 "6 " 



Hard white sandstone 41 " 



Other test-borings made on the land of the Coal Mining Com- 

 pany of Jackson, as recorded by Mr. Walker, are : 



No. I begins below the sand rock : 



Black shale with kidney ore 12 ft. 



Fire-clay 6 " 



Black shale 13 " 



Coal, bituminous 4 '' 



No. 2 : 



Black shale 8 ft. 



Fire-clay 5 " 



Black shale 9 " 



Coal 4 " 6 in. 



Carbonaceous shales, sand rock, and iron pyrites below. 



