122 REPORT OF THE 



In the vicinity of Corunna, which is still further within the 

 basin, the coal has been successfully worked on a small scale 

 for a number of years. I\om an outcrop in the bank of a small 

 creek on the W. J N. E. frl. J, sec. 22, Caledonia. Mr. Alexander 

 McArthur has removed several thousand bushels of broken coal 

 for the supply of neighboring blacksmiths. An excavation 

 made at this place by the Detroit and Milwaukee Railroad Com- 

 pany, reveals the following section: 



Highly ferruginous loam, 4 f 1 



Blue clay, intersected by undulating bands of kidney iron 



nodules, 4 ft 



Black bituminous shale, 2 ft 



Bituminous coal, 3 J ft 



Clay. 

 Sandstone. 



The coal is of a handsome quality, and is intersected, like the 

 seam in Jackson county, by a streak of pyrites. 



Half a mile east of here, the overlying Woodvillc sandstone 

 makes its appearance. In a shaft sunk by Frazer and Stanton, 

 not the one now worked, the following section was passed: 



Superficial materials, 5 ft 



Sandstone, 5 ft 



Clay, 5 in. 



Coal, 3 ft 



Fire-clay, intersected by a band of impure, argillaceous 



iron ore, , 1 6 ft 



Sandstone, : 3 in. 



Fire-clay, 4 ft 



The prevailing sandstone exposed at Rock Bar, at Blossom's 

 quarry, and numerous other localities in the vicinity of Corunna, 

 is probably the sandstone which overlies the coal. 



At Owosso, a shaft was sunk by the Detroit and Milwaukee 



Railroad Company, with the following result, as communicated 



by B. 0. Williams, Esq., to whom I am indebted for much 



assistance: 



Sandstone, flesh colored, seen also in bed of river,. ... 14 ft 



Black band iron ore, 1 ft 



Cannel coal, 2 ft 



Dark shales wth vegetable remains, 15 ft 



