234 GEOLOGICAL RECONNOISSANCE 



Six hundred feet of the rocks, exposed in section in the Carrion Crow 

 mountain, near Mr. Potts', on Galley creek, are here given: 

 Millstone grit in three benches of thick-bedded rock, having 



shale between — in all about 400 feet. 



Space concealed by debris, mostly flagstone and shale 140 " 



Argillaceous shale GO " 



Semi-bituminous coal 1.3? " 



Galley Creek " 



601.3 feet. 



The above thickness of the individual members will be subject to a cor- 

 rection for a slight north-west dip. 



Some iron ore was observed in the Carrion Crow mountain, under the 

 upper bench of sandstone; but the greater portion of it contains too much 

 silica to be considered valuable for the manufacture of iron. The coal 

 at the base of the mountain has the same appearance as the semi-bitumi- 

 nous coal of Frog and Illinois bayous. It was not sufficiently opened to 

 be cen well. 



Agriculture. 



The cultivated lands lie chiefly in the southern part of this county, east 

 of the Illinois bayou. There are extensive districts of level tracts, chielly 

 in townships 0, 7, 8 and 9, ranges 19 and 20 west, that are very produc- 

 tive, especially adapted for wheat. The soil of this region overlies, and 

 has mostly been derived from, the disintegration of the reddish and dark 

 shales at the base of the millstone grit, sufficiently intermixed with sili- 

 ceous washings from the overlying flagstones to correct their otherwise 

 tenacious and refractory character. Samples of soil were collected 

 from John P. Langford's land, on the Illinois bayou, five miles north- 

 east of Dover. The timber was very large and mostly oaks with some 

 hickory. 



