The Mh>^nnrl R i rev. — Brand />ea<1. 153 
EXJSTKN( E to the period of the Ozakk uplift, aa shown in my 
article previously j)ublisheil.' That article pertained only to 
the Ozarks and adjacent country, and altlioughnot definitely 
designated I intended only to convoy tlie idea of the age of 
the lower Missouri, and not of the upper portion. The u[)per 
river was not then considered. 
The age of the lower Missouri, at least from Omaha down, 
is contemporaneous with that of the Mississippi from its head 
to the mouth of the Ohio. The Monoclinal along the eastern 
border of the Ozarks is either directly in the channel of the 
Mississippi, or in hills near by, as shown by eastern di])ping 
of rocks, and strikes of low anticlinals passing eastwardly. 
The monoclinal along the northern border of the Ozarks is 
also very near the channel of the Missouri river, or in the 
hills adjacent, as proven by examination at numerous places 
near the river where the strata dip strongl}- to the North, and 
also by the several strikes of low anticlinals passing off north- 
wardly beyond the edge of the monoclinal. These effects were 
more fully discussed in my article on "The Ozark uplift." There 
are no rocks of later age than the upper Carboniferous in this 
lower district. The effects of the uplift are alike along the 
Missouri and the Mississippi. One wlio has observed these 
features will readily come to one, and only one conclusion — 
THKY ARE OF THE SAME AGE. In what Way the lower and the 
upper rivers came to be connected has yet to be demonstrated. 
It took place either in very late Tertiary or just subsequently. 
There undoul)tedly were streams tributary to the great Lara- 
mie lake, and the upper Missouri (above the ''falls'') may 
have been a developed tributary. While the lake dried out 
during the later Tertiary, various fissures were opened, chan- 
nels for streams worked their way along the descending slope, 
and through these fissures the waters of the upper Missouri 
passed and united with the lower river. 
After the Archaean there was a period of quiet, permitting the 
deposit of 30,00) feet of strata in the eastern Ignited States ; 
during the same time in Missouri 1,500 to 2,0(X) feet were de- 
posited, including the Magnesian limestone series of south 
Missouri. The total Palicozic series in Missouri amounts to 
about 5,000 feet. 
The greater portion of the Ozark plateau has been dry land 
'This journal. Jan. 188;>. 
