Succession of the Ozark Series. — Xason. 141 
Fig. 3. Cyrtoceras (Glyptodendron) subcompressum Beecher. Lat- 
eral view, showing on the right the dorso-lateral angle, and on the left 
a part of the original surface, preserving the " scars *' in places. This 
is a drawing of the exterior of the specimen whose section is shown 
by Fig. 76, of Plate vn, in vol. xxiv of the Proc. Boston Soc. Nat. Hist., 
1889. The figure Id, of the same plate, is more regular than in nature, 
though on the dorsal side of other specimens greater regularity is shown. 
Brown's quarry, two miles west of New Carlisle, and ten miles west of 
Springfield, Ohio. 
All the figures, except Id, are reversed, the aperture of the shells be- 
ing directed downward. This is done to secure a light favorable for the 
ready demarcation of the " scars."' 
"THE CORRECT SUCCESSION OF THE OZARK 
SERIES:" A REVIEW REVIEWED.* 
By Frank L. Nason, Jefferson City, Mo. 
In the April number of the American Geologist for 1893, 
Prof. Broadhead criticises my conclusions in regard to the sand- 
stones and limestones of the Ozark series, as published in "The 
Iron Ores of Missouri." 
On the face of it there would seem to be no necessity for 
interfering, in a special report on iron ores, with the geologi- 
cal correlation of other geologists, either antecedent or con- 
temporary. In the beginning of my work I had no intention 
of doing this, but proposed to accept my geological facts from 
others. As my studies of the " Specular Ores of the Sandstone 
Region " progressed, I felt myself compelled to understand 
thoroughly the relation between the so-called " Second sand- 
stone" and the so-called '-First sandstone." Work in this 
direction had not progressed far before the suggestion came 
that the two were in reality but one, and after the study of 
the river sections this suggestion became a settled conclusion, 
at least so far as the Ozark region is concerned. It will not 
be necessary to go into detailed reasons for the necessity of 
this. The main fact of general interest is this: The writer 
concludes that in the Ozark region there is but one sandstone ; 
Prof. Broadhead defends the idea of three sandstones. In the 
same candid spirit with which Prof. Broadhead attacks my 
work, I wish to defend it. 
*The Correct Succession of the Ozark Series. By Prof. G. C. Broad- 
head, State University, Columbia, Mo. 
