120 REPORT OP THE 



Coal crops out at numerous places in the vicinity. It is said 

 sometimes to show a thickness of two or three feet at the out- 

 crop, but soon thins out. 



Mr. Patton, on the east side of the river, near the south line 

 of section 22, has made an excavation for coal and found a 

 seam 18 inches thick which is tolerably hard. 



The sandstone taken from the quarry above Flushing, is a 

 pale, bluish rock, abounding in scales of white mica, ferrugin- 

 ous streaks, pyrites, carbonaceous streaks and curls, and much 

 oblique lamination. What is quite remarkable, I saw in a 

 block of this stone, in the vault of the Bank in Flint, a long 

 club of fibrous talcose slate, a mineral said te occur in consid- 

 erable abundance. This rock does not answer to the characters 

 of the Woodville sandstone at any point where its identity is 

 undoubted, and I am induced to regard it as a sandstone in- 

 cluded in the coal measures. If it is so, this is the only instance 

 within my knowledge where any of the included sandstones 

 have attained sufficient development to be worked. It is likely, 

 however, that the gray, homogenous, fine, gritty, faintly-banded 

 sandstone, found within a mile or two ef the city of Lansing, 

 will be found to hold the same position. 



Sandstone, not unlikely the Woodville sandstone, is found 

 outcropping in the township of Montrose, on the borders of 

 Saginaw county. 



The next observed point in the boundary line of the coal 

 field is near the village of Tuscola, in Tuscola county. On the 

 S. W. \ Sec. 29, T. 11 N. 9 E, a seam of coal crops out in the 

 bank of the Cass river. Numerous fragments of an arenaceous 

 fire-clay, filled with Stigmaria roots, are strewn about. Some 

 shales occur here, in which is found a Lingvla. 



According to information recently received from Dr. G. A. 

 Lathrop, to whom I am under great obligations for his free 

 co-operation in my researches, a shaft has been sunk on the 

 north side of the river, with the following results: 



Cla y. u ft. 



Fire-clay, 3 ft 



