ON THE UPPER MISSISSIPPL 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 Huwomphalus, 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, Cala- 
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. 
