COAL MEASURES. 133 



Drift, up to the plateau of the hillsides 30 ft. 



Blue soft shales with kidney ore 15 " 



Sand rock with Stigmaria 2 " 



Thinly laminated shaly sand rock 4 " 



Black carbonaceous shale, or coal in its stead, . . i " 



Sand rock with Stigmaria, from i to 2 " 



Blue shales, partly arenaceous, containing kid- 

 ney ore 7 " 



Black shale or coal several inches. 



Sand rock with Stigmaria 2 ft. 



Blue shale 2 " 



White ripple-marked sand rock thinly laminated 4 " 

 Nodular white sand rock, with ferruginous dots 

 and interlaminated with seams of shale, 



visible 3 " 



The lower beds are submerged. 



This section is directly continued by an artesian boring, made 

 at the Mineral Spring Hotel, to a depth of 105 feet. The boring 

 begins in the last-mentioned sand rock, which is found to be 20 feet 

 thick ; beneath follow 5 feet of fire-clay, then 40 feet of white sand 

 rock, a seam of coal 16 inches thick, carbonaceous shales from 3 to 

 4 feet, and lighter-colored shales 12 feet. At 80 feet below the sur- 

 face a conglomeratic sand rock is struck, from which a copious 

 stream of water rises to the surface. The sand rock continues to 

 the depth of 105 feet, where another water-stream is struck. The 

 water has an agreeable mineral taste. On the opposite side of the 

 river, subsequent to this boring, another well was opened, which 

 seems to be in subterranean connection with the well of the Mine- 

 ral Spring Hotel, whose tube had to be shortened 2 feet in order 

 to secure an overflow after the other well began to discharge its 

 stream. 



A good section through the formation can be observed in the 

 ravines of a creek entering Grand River from the south, a short 

 distance west of the village, and another, in the bluffs just below it, 

 and opposite the section last described. Highest in this latter, under 

 a few feet of drift, are 15 feet of arenaceous shales with nodular 

 seams of sand rock and kidney-ore concretions, and a band of car- 

 bonaceous shale with seams of coal ; beneath follow 8 feet of a fine- 



