STATE GEOLOGIST. 115 



attain their normal thickness, though the principal seam of coal 

 is very little diminished. The most southerly point at which 

 coal has been found in place, is at Hayden's mine, where it was 

 discovered in 1835, in digging the foundation of a mill. This 

 is on section 1, in the township of Spring Arbor. The opening 

 .occurs on Sandstone creek where it is crossed by the highway, 

 on the |th section line running south through the S. E. \. The 

 outlier seems to be embraced in a gentle elevation, covering, 

 perhaps, 40 acres to the west of the opening. Some distance 

 up the hill slope, a boring was made with the following result: 



E. Drift materials, 8 ft. 



D. Shale, .' 22 ft. 



0. Ooal 4 ft. 



B. Under clay 14 ft. 



' A. Parma Sandstone. 



In the drift which has been carried into the hill the coal is 

 found only three feet thick, and contains a seam of Iron Pyrites 

 one foot from the top. Fragments of Black Band Iron Ore are 

 brought out, which contain impressions of fishes. The sand- 

 stone (A) comes to the surface a few rods to the north, and a 

 boring for coal was executed in it, of course without success. 

 The boring,' however, became an Artesian well. 



One mile north of Hayden's mine, occurs the Woodville mine, 

 owned by the Detroit and Jackson Coal and Mining Company. 

 • We here find the coal measures overlain by a sandstone, which, 

 from its good exposure in the cut of the side track from the 

 mine to the Central Railroad, has been designated provisionally 

 the Woodville Sandstone. The section passed in the shaft of 

 this mine is as follows : 



E. Superficial materials, 12 ft. 



D. Woodville sandstone, 30 ft 



■ 0. Shales, dark bituminous, with 6 feet of fine light color- 

 ed clay, 43 ft. 



B. Bituminous coal, 4 ft. 



A. Under clays, 3 ft. 



A few rods from the shaft toward the north-west, the sand- 

 stone was found 45 feet thick in a boring. The cut of the side 



