92 The Ainerican Geologist. February, issia 
more of these streams down the opposite slopes of the Ozarks, a 
section, showing the succession of sandstone and limestone, would 
be found. 
Accordingly a boat trip down the Big Piney from Cabool, near 
the highest point of the Ozarks, to where the Big Piney empties 
into the Gasconade and thence down this last river to the Missouri, 
was made. For the section down the southern slope of the 
Ozarks, current was followed from Riverside, in Shannon county, 
to Doniphan, in Ripley count3^ and near the Arkansas and Mis- 
souri line. 
In the vicinity of Cedar gap, thirty miles west of Cabool, on the 
K. C. M. & B. R. R. , the younger rocks. Lower Carboniferous, 
are found in contact with a Magnesian limestone. From Cedar 
gap to Cabool there is a succession of limestone and sandstone 
outcrops. The limestone for the most part appearing on the 
higher ridges, the sandstones in the depressions. No detailed 
work was done here, only observations made from freight trains 
which stopped at every station for several minutes. The higher 
hills appear to be covered with a shaly limestone which doubtless 
belongs to the younger formation. 
The above observations are valuable only as they seem to sup- 
plement the fact that Lower Carboniferous fossils in chert were 
frequently found on the higher bluffs down both the northern and 
the southern slopes of the uplift. It is thus probable that the 
Lower Carboniferous once extended over the entire Ozark uplift. 
In the vicinity of Cabool limestone of the Magnesian series cov- 
ered nearly the entire rock outcrop. Near the Big Piney, how- 
ever, and in the drainage basins leading into it, sandstone, 
ripple-marked, in places saccharoidal, in others flinty, is a com- 
mon rock. 
In the Big Piney itself, about eight miles from Cabool, flinty, 
ripple-marked sandstone appears covered by heavy beds of clay. 
These clays farther down become interstratified with argillaceous 
and cherty limestones, and these, where the river cuts deepen, by 
beds of limestone l3ing on top of the sandstone. 
Farther down the stream heavy beds of sandstone appear cap- 
ping the higher blufl's which often rise precipitously from one 
hundred to five hundred feet. In, or rather f>»,many of the bluffs 
no sandstone appeared near the river, but following the rise back 
from the river a distance of from one-half of a mile to a mile, 
