Stratigraphy of the Missouri Palatozoic. — Broadkead. 77 
The third Magnesian limestone is well exposed on Little 
Piney and the Gasconade creeks at Clifty. Dry Creek, Pay- 
down and the Narrows, and as far north on the Gasconade as 
Mount Sterling; and it is easily recognized. Friede's cave is 
in this limestone as also the "Natural Bridge" on Clifty creek. 
Below the mouth of Little Piney it is over ISO feet thick with 
the Second sandstone lying above it. The Second sandstone 
which overlies the Third Magnesian limestone, although 
rarely containing fossils is easily recognized by its position 
above the Third Magnesian and below the Second Magnesian, 
and cannot be confounded with the First sandstone ( St. Pe- 
ter's). The Second sandstone is coarser-grained than the 
First, is not so white and is more coherent. It is also some- 
times quite useful for building purposes. 
The Second sandstone occurs at many places in the Gasco- 
nade bluffs overlying the Third Magnesian limestone, being 
about 50 feet thick, near the hilltop at the mouth of Little 
Piney. Following down the Gasconade it descends lower in 
the hills as we approach Mount Sterling, where it soon dips 
beneath the horizon. Thence to the mouth of the Gasconade 
the prevailing rock is the Second Magnesian limestone and as 
we approach the Missouri, the First sandstone is seen high in 
the bluffs. The Second sandstone is often overlain by a few 
feet of siliceous cellular rock, as seen in Cole county and also 
in Webster. Referring to page 10 of Geol. Report of 
Missouri, 1855-71, we find several notices of the occurrence of 
the First sandstone on high ridges east of the Gasconade. 
The elevation of these ridges is between 1000 and 1200 feet 
above the sea, The Second sandstone is seen at Arlington at 
about 880 feet above the sea, or 200 to 300 feet lower, which 
would be about the thickness of the intervening Second Mag- 
nesian limestone, and the beds of Second sandstone on the Gas- 
conade opposite these outliers is as low or lower. The two 
sandstones although apparently not far off horizontally, differ 
too much in their vertical position to be confounded. 
The First sandstone is found near the hilltop at several 
places between the Gasconade and Washington. It is in tin- 
railroad cut at Gray's Summit and occupies the base of the 
hill at Pacific, at Horine and at Crystal City. At all of these 
places it is overlain by the well known First Magnesian Lime- 
