162 GEOLOGY OF ILLINOIS. 



The limestones above described (Nos. 30 and 31) correspond to similar 

 beds at Litchfield and on *Lake Fork in Montgomery county. 



Economical Geology . 



Goal. — South of Pana coal has been taken out at several places along 

 the head waters of Coal creek; but at the time of my visit the only 

 place worked was White's bank, on sec. 34, T. 11 N, R. 1 E. The seam 

 here is about 22 inches thick, of good quality, and obtained by drifting 

 into the hill side at an elevation of about 30 feet above the level of the 

 creek. The position of this coal in the geological series is about 420 

 feet above coal No. 7, and corresponds to No. 14, counting from lowest 

 coal upwards, and is numbered 17 in my general section of this and 

 adjoining counties. A ten-inch seam crops out a quarter of a mile up 

 stream from Greenwood's mill, but the coal is of poor quality. Beneath 

 the limestone at Greenwood's mill, and a little below low water, a 17 

 inch seam ought to be found ; the same bed also probably exists be- 

 neath the limestone at North Fork mills, probably six feet below low 

 water. This coal is probably about 365 feet above coal No. 7. 



Building material. — South of Pana Mr. Burke has a quarry of hard 

 gray sandstone, which appears to be very durable. At Mr. Wash- 

 er's, six ii.iles north-west of Pana, on Locust Fork, there is four feet of 

 ash-gray limestone, weathering bluish-drab. The beds are rather thin, 

 but the rock is of good quality. On Jas. P. Durban's land, two miles 

 north-west of Walcher's, there is a very good quarry of deep blue 

 limestone; the lower bed, if properly quarried, would make a pretty 

 and durable building stone. 



Ealston's and Greenwood's quarries, on the South Fork of Sangamon, 

 each contain several good beds of building stone, and make excellent 

 lime. There are similar quarries at the North Fork mills, and three 

 miles west. 



The lower two feet at Stokes' quarry, in sec. 16, T. 14 N., E. 3 W.. 

 would probably make a pretty marble ; it is a fine-grained, even-textured, 

 dove-colored limestone, with many lines and specs of calc-spar. 



'Note. — I also believe them equivalent to Nos. 162 to 166 of my- Missouri river section, published 

 in Vol. 2, No. 2, Trans. St. Louis Acad. Sci., St. Louis, 1866. The limestones of the North and South 

 Fork of Sangamon closely resemble, both in lithological appearanoe and fossils, beds in the northern 

 part of Cass county, and those near Randolph, in Clay county, Missouri. 



