198 



GEOLOGY OF ILLINOIS. 



Section at Shawneetoicn, Gallatin county, III., of Mill stone- grit and over- 

 lying shales exposed at loic icater of the Ohio river. 



L— . Argillaceous shale, nearly horizontal. 



■ -- Argillaceous and silicious shale, with hand of septaria limestone, "Black 

 Marble." Some coaly matter; dip 15° S. 



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Argillaceous shale, with numerous bands of clay iron-stone ; dip 10° to 25° S. 



|W_. Sbale and coaly matter; dip 10° S. 



__ Shale, with thin irregular-bedded sandstone ; general dip about 20° S. 



$»-— Pyritiferous shale, some coaly matter and intercalated limestones ; dip 20° S. 



$L— Hard gray sandstone, coarse-grained ; patches of thin coal ; dip 10° S. Con- 

 glomerate. 



_, Shelly uneven-bedded sandstone. 



Conglomerate ; large casts of SigiUaria. 



Covered space. 



„ Conglomerate ; dip 10° S. 



I 



