EFFINGHAM COUNTY. 181 



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5. Olive clay shales 3 



6. Hard sandstone 3 



7. Mostly clay shales 5 



8. Limestone 3 2 



9. Coal Xo. 16 16 



10. Drab sandy shaleg 8 



The last named limestone (No. 8) is No. 17 of the general section in 

 this county and regarded as the equivalent of No. 2 of the section in 

 Shelby county ; the shales and sandstone above it are similarly devel- 

 oped on the south fork of the Kaskaskia, in Moultrie. The limestone 

 occupies the bed of Fulfer creek, two miles above the mouth of Lime- 

 stone creek, extending quite across, and is beautifully jointed by perpen- 

 dicular cracks meeting at oblique angles, thereby forming rhomboidal 

 blocks. This limestone dips down stream and is soon out of sight 

 beneath the water. It is not found below the mouth of Limestone 

 creek, and the overlaying sandstones and shales appear in its stead. 

 Its fossils mostly occur near the middle and are Spirifer cameratus, Pro- 

 ductus punctatus, and P. longispinus. On Limestone creek the limestone 

 rests directly on the coal. At Mahon's quarry it is separated by eight 

 inches of clay, and the coal rests on five feet of thinly laminated buff 

 and gray sandy shales. 



At G. W. Nelson's, in sec. 20, T. 6 N., E. 4 E, a section of his well 

 shows : 



Ft. 



1. Chocolate-colored shales 14 



2. Bine shales 6 



3. Clay and nodnles of limestone and some peculiar looking fucoids, flat, -with round edges and a 



spiney hirsute appearance 18 



A half mile west at the coal bank the section continues thus : 



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1. Loose chertyrock, with casts of fossils, Hemipronites crassus, Producluspimctatus, Spirh 



fer cameratus, Prod, costatus, Chonetes 2 



2. Blnish-drab limestone ; under ground it bag a "white surface. Its fossils are Athyris sub- 



tilita, and Leplodomus 4 



3. Dark -blue and buff shales 8 



4. Calcareo-bituminous shales 2 



5. Coal(No.l6) saidtobe 3 



6. White clay 



I regard the limestone and coal at Nelson's equivalent to that of 

 Limestone creek — it agrees with the dip. 



The lowest rocks occur on Beech creek, and consist of : 



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1. Sandstone, the lower three or four feet streaked with thin seams of red oxydof iron 30 



2. Coal, (No. 15, or Shelby coal) 1 



3. Ash-blue clay 3 



4. Earthy limestone, mostly nodular 2 



5. Coarse drab shaly sandstone 



