IOWA, AND WAPSINONOX RIVERS. 89 
bottoms. The latter afford luxuriant meadows, and productive arable land when 
sufficiently elevated to be above overflow. On the crests of the hills are, occasion- 
ally, a few small erratics, siliceous gravel, and small angular masses of chert, but no 
protruding ledges in place. 
It is in this vicinity, where the Iowa River meanders near the confines of the 
carboniferous rocks, and those particularly described in this section, that the preced- 
ing sketch was taken, from the hills on the west side of the river. 
