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--.-. +--+) penne ere neee 400 feet. 
Space concealed by debris, mostly flagstone and shale--+-- 140 RS 
Argillaceous shale... fool Vata cete sreiguayie ara Jae whereas Sogheenters 3 60 “ 
Semi-bituminous coalesce seecececcceereeeeveverecee 13° 
Galley Creeks + sess e cece eset acces erent cence ane nnaenes 0 “ 
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 seen 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, chiefly 
in townships 6, 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. 
