Stratigraphy of the Missouri Palaeozoic. — Broadhead. 70 
its measured thickness found to be the same as that observed 
at Augusta, over 30 miles distant. On L'outre river, near the 
line of Callaway and Montgomery, the succession is: 
(1) Trenton, (2) First Magnesian, (3) the First sandstone. 
About three feet of the upper portion is found here to be ver- 
tically columnar, seemingly as if worn by water, or as ice ap- 
pears on the edge of a melting block. West of central Mis- 
souri the St. Peter sandstone and the first Magnesian lime- 
stone become thinner, and at some places are entirely want- 
ing. 
Partial List of Fossils op the Ozark Series. 
a £ 
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Third 
Magnesian 
Limestone. 
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Scolithus 
X 
X 
X 
X 
Trilobite, sp 
X 
sp 
X 
Lingula 
X 
X 
X 
X 
Orthis 
X 
X 
Obolella polita 
X 
Murchisonia caranifera 
X 
X 
X 
X 
X 
X 
" ozarkeneis 
Lioxonema 
Straparollus valvato formis. . . 
X 
X 
X 
X 
Rapbistoma subplana 
Ophileta 
X 
X 
Metoptoma 
X 
X 
X 
Turbo 
X 
Maclinea 
Pleurotomaria 
X 
Endoceras 
X 
X 
X 
X 
Phragmoceras 
Orthoceras 
X 
Lituites 
X 
X 
The annexed section of the well at the Insane Asylum. 
St. Louis, indicates four sandstones below the Second sand- 
stone. The outcrops at the surface in southeast Missouri 
show three sandstones, the First. Second and the "Potsdam," 
at the base of the Ozark series. Prof. Swallow's general sec- 
tion includes three sandstones, from tin- First to the Third, 
inclusive, without counting their intercalated beds. 
