Geology of Upper Illinois. 



143 



to the Wabash J in Indiana, at a point several miles above La 

 Fayette.* 



We are now prepared to enter upon a more minute description 

 of the geological features of the country, contiguous to the wes- 

 tern termination of the canal, where the coal in particular is 

 largely developed. To render the subject the more easily intelli- 

 gible, a sketch of the region, together with a cross section exhib- 

 iting the north bluff of the Illinois river, from Ottawa to Spring 

 creek, are subjoined. 



%; 





CarliTiifei'ous ^^^[^il ^ 







-" -:- ' ' ssiirmdiinrid ^jL. - 



1 . Z sTaiv^chy&ci/al- 

 WMu, ~~ •^ — -*'_r'- — 



VeTiJiilionville 



* In speaking of the boundary of the coal-field, I wish to be understood in gen- 

 eral, as treating of its line of junction witli the niagncsian limestone. Whether 

 the coal-beds run out against this rock, or are continued bcneatli it, no facts liave 

 yet been observed in this country sufficient to show. The extent of the magne- 



