The Ozark region was thus the first land
to appear within the borders of the present state of Missouri." He
further says: "Although it has long been known that the Magnesian
Limestones are older than the Trenton, and that they lie immediately
upon and against the Archaean crystallines unconformably, their exact
geological age has always remained unsettled. There seems to be but
little doubt, however, that part of the series is equivalent to the
Calciferous of other regions. It is also pretty well determined that
certain of the lower beds, all below the 'Saccharoidal' Sandstone
perhaps, are representatives of the Upper Cambrian or Potsdam. These
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.
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