conclusions appear well grounded both upon stratigraphical and faunal
evidence. The rocks of the Ozark region have not as yet received the
necessary detailed study to enable the several lines of demarkation to
be drawn with certainty. This investigation is now being carried on as
rapidly as possible, and promises very satisfactory and interesting
results in the near future."

"The early geological reports represent the Magnesian Limestone series
as made up of seven members. Following Swallow, these may be briefly
described in the present connection. Beginning at the top, they are:

First Magnesian Limestone.
First, or Saccharoidal Sandstone.
Second Magnesian Limestone.
Second Sandstone.
Third Magnesian Limestone.
Third Sandstone.
Fourth Limestone."

"The Fourth" Magnesian Limestone, or lowest number of the Ozark series
recognized, has its typical exposures along the Niangua and Osage rivers
in Morgan and Camden counties.

Professor Swallow, in his Missouri Geological Survey Reports I. and II.,
1853 and 1854, says: "Caves, natural bridges and subterranean streams
occur in the valley of the Osage and its tributaries." The same
authority of forty years ago also mentions that "Some of the grandest
scenery in the State is produced by the high castellated and mural
bluffs of this (Third Magnesian Limestone) Formation, on the Niangua and
the Osage." Another reference to the scenery on these rivers describes