ON T II E 



U P P E R 



MISSISSIPPI. 



509 



The coal is of the same quality as that on the creeks above-mentioned. 



The hills are here elevated about eighty feet above the river. 



A few hundred yards above Pine Creek, these limestones are visible eleven feet 

 thick, and gradually rise to eighteen feet, the dip being about 3° to the southwest, 

 and contain many of the same species of fossils as have been enumerated. 



Three miles below the mouth of Pine Creek, the ferruginous bed of limestone has 

 ash-coloured layers above it, containing a Euomphalus, and several corals of the 

 same species as are found in the equivalent beds on the Falls of the Ohio. These 

 beds extend for about half a mile along the river, and rise to the height of seven- 

 teen feet. 



From one to two miles below this last exposure, the sandstones of the coal- 

 measures appear in mural cliffs, on the right bank, containing Lepidodendra, Cata- 

 mites, and Sigillaria, and under these, argillaceous shales can be perceived ; above, 

 there are thinly laminated shaly layers. At the upper end of the exposure the 

 sandstones are twenty feet in height, gradually increasing in elevation down stream ; 

 they finally reach ninety feet above the water-level, the hills being about one hun- 

 dred and thirty feet. 



It was not until we reached the vicinity of the mouth of the Iowa, that we dis- 

 covered any carboniferous limestone. This seems, as far as we have been able to 

 ascertain, the highest point on the Mississippi where limestones of this age can be 

 traced. 



