170 GEOLOGY OF ILLINOIS. 



blue shale. At one place the shale commenced at and thickened to 14 

 feet within 100 feet distance. Below the coal there is not over one 

 and a half feet of fire clay, and then a hard nodular limestone. 



A half mile west of Prairie Bird on sec. 30, T. 12 N., E. 3 E., on Brush 

 creek : 



Ft. In. 



1. Soil and buff clay 



2 Soft buff sandstone 8 



3. Thinly laminated light-blue shales 4 



4. Bituminous coal. - 18 



5. Fire clay 2 



6. Coarse rough nodular calcareous sandstone 



The hills near this place are about thirty feet high and of easy slope. 

 Down the creek a half mile the coal is seventeen inches thick and capped 

 by ten feet of chocolate-colored sandy shales. 



On the land of J. Armstrong, on sec. 35, T. 12 N"., B. 2 E., there is over 

 the coal four or five feet of firm gray or brown sandstone containing 

 plants. 



Below the hard sandstone on Copperas creek, previously mentioned, 

 there is two feet of bituminous shales resting on two feet of dark-blue 

 clay shales. These beds are probably near the horizon of coal No. 14. 



Between coal Nos. 14 and 15 there is about forty feet of sandstone 

 and shale. Coal No. 14 was only found on the waters of Beck's creek. 



On Mrs. Sides' land, one and a half miles south of the railroad, we 

 have : 



Ft. In. 



1. Sandstone, atone place very hard, at another soft 5 



2. Ferruginous shales passing into a conglomerate 4 to 12 



3. Lead-blue calcareous shales 2 



4. Coal 13 to 15 



5. Fireclay 



At one place the sandstone is scarcely separated from the coal. In 

 the south part of sec. 2, T. 10 N., K. 1 E., I observed as follows : 



Ft. In. 



1. Mostly chocolate-colored argillaceous shales 10 



2. (= No. 14 of upper Coal Meas. Sec.) Calcareous shales contaiuing Heinipronites crasms, 



Spiri/erina Kentuckensis, Lophrtphyllum proliferum, Zeacrinus, and a crinoid resembling 

 Agassizocrinus 1 



3. Blue and bituminous shales 3 



4. (= No. 16 of upper Coal Meas. Sec.) Dark lead-blue calcareous shales, passing into a 



shaly limestone ; abounds in Spirifer plano-convezus and Bemiproniles crassus ,- also 

 contains Orthis carbonaria, Orthoceras cribrosum, Pleurotomaria Sphcerulata, Chonetes 

 Flemingii, Productus costatus. Sp. cameratus, Euomphalus sub-rvgosu^, Lophophylium 

 proliferivm 



Besides the above named fossils there is found on the Fayette county 

 line : Prod. Ifebrascensis, Prod, longispinas, Retsia jpunctiilifera, iSpiri- 

 ferma Kentuckensis, and Orthis carbonaria. 



Ft. In 



5. Bituminous coal 20 to 22 



6. Fire clay, calcareous nodules in the lower part ". 5 



7. Hard rough calcareous sandstone contaiuing Productius PraUenimius 



