102 GEOLOGY OF ILLINOIS. 



seitula ? Phillipsia scitula, Pleurotomaria sphcerulata, P. Grayvillensis, 



Bkynclionella Osagensis, Productns longisphvus, P. Lasallensis ? Entolium 

 amculatum, Belleropfton percarinatus, Polyphemopsis peracuta, Macrochei- 

 lus inJiaiilis, N'ucula, Orthoceras, Nautilus, Loplwphyllum proliferum, etc. 



The impure limestone, No. 8 of the foregoing section, I am inclined 

 to regard as identical with the Ftisulina bed, although I could not find 

 the characteristic fossils in it at this locality. This limestone thins out 

 in the south part of the county, and the most southerly outcrops observed 

 contain few or no fossils, but the outcrops are so continuous on the 

 Embarras and its western affluents that there seems to be no doubt 

 that they all belong to the same formation. 



In Coles county this limestone continues along the valley of the 

 Embarras at least as far north as the mouth of Brush creek, where it 

 overlays a seam of coal, No. 16 of the Illinois section, while the 6 inch 

 coal in the foregoing section most probably represents the thin coal, or 

 highest seam of the general section. 



Prof. Cox reports a coal seam about a quarter of a mile west of the 

 county line in Shelby county, which from its thickness and general 

 character agrees very well with the Shelbyville coal, or No. 15 of the 

 general section. " This is on Mr. Hancock's place on sec. 12, T. 10, E. 

 6, where the following beds were seen : 



Ft. In. 



Blue argillaceous shale 3 



Fireclay 3 



Coal 1 6 



Slate parting 1 



Coal, hard and impure 1 



About 200 yards west of the point where the coal was opened, on a 

 branch of the Little Wabash river, there was ten feet of blue argilla- 

 ceous shale above the coal, which further down the stream gives place 

 to a thick bedded sandstone." 



He also reports the Fitsulina limestone on Bear creek, sec. 22, T. 10, 

 E. 8, near Mr. John Prather's, where the bed is 4 feet thick, overlaid 

 by 20 feet of sandstone. At Prairie City the limestone was passed 

 through in sinking the well at the mill, and found to be 4 feet thick, 

 with shales above and below it. 



The trend of the strata in this county is evidently very nearly north 

 and south, as the course of the Embarras is on nearly the same geologi- 

 cal level through this county and Coles for a distance of 25 to 30 miles 

 or more, and the dip, if any, is apparently to the westward. There are 

 no streams in either county that intersect the general outcrop in an east 

 and west direction, and no connected section of the outcropping forma- 

 tions could therefore be made. The small streams do not cut through 

 tlie heavy drift deposits, and hence exposures of the Coal Measures are 

 only to be met with on the Embarras and the lower courses of its main 

 affluents. 



