Mag nesian Series of tJie (Jzarh Cpl'ift. — Na>inn. 93 
heavy beds of sandstone were usuall}' found. That is. the sand- 
stone found at the river level near Cabool was getting higher and 
higher above it. 
Another fact worthy of note is that the sandstones are often 
lenticular. A thick bed of sandstone would occasionally show a 
thin seam of limestone. In a succeeding bluft' the limestone 
would increase to the point of reducing the sandstone to a thin 
seam, and the next bluff would show the sandstone at its normal 
thickness again. Two or three layers of this sandstone and lime- 
stone occasionall}' appear. But without this thickening and thin- 
ning in lenses, one fact is very readily apparent, the sandstones 
never lose their own but are growing higher and higher in alti- 
tude as the river reaches its lower level; and, as the country is 
cut deeper and more numerously by adjacent as well as tributary 
streams, the sandstones form, often broken, caps on the limestone 
of the divides. In spite of the fact that occasional lenses of sand- 
stone or gritt}' layers are formed in the limestone, the limestones, 
as the sandstones retreat above and from the river to the highest 
points of the divides, are growing purer, more heavily l>edded, 
and thicker toward the Missouri river. 
When the Missouri river is reached we find that the sandstone 
with which we started at Cabool has been persistent, and the only 
persistent bed of sandstone, and that from being the surface rock 
continuously bedded at the river level at Cabool, it now caps the 
blufl's which rise sheer from the Missouri river, east of Gasconade 
City, to the height of over three hundred feet. Without going 
into detail, it may l)e pointed out that the section down Current 
river shows the same phases which have been pointed out above. 
The highest hills on this river are about six hundred feet above 
the river and they are practically solid limestone from the river to 
the more or less broken cap of sandstone which usually is found on 
the summits of the hills. Conclusive as such sections are, with 
respect to establishing the continuity of a given l)ed. there are often 
concurrent facts which almost, if not entirely, remove all doubts. 
In the Ozark series fossils have rarely been found. Casts in 
loose chert, which has evidently come from the decomposing 
Magnesian limestones, are frequently met with, but this chert has 
rarely been found in .sifn. During the excursion down tlie rivers 
search was made for fossil localities which might serve as a means 
of identifying widely separated rock strata. This search was re- 
