Succession of the Ozark Series. — Broadhead. 261 
recent age than the porphyries should all be considered as belong- 
ing to the age of the Upper Cambrian. The first or Saccharoidal 
(St. Peters) sandstone, and the fii'st Magnesian limestone may be- 
long to Lower Silurian, but there is not sufficient evidence on the 
subject. 
The recent publication entitled "Iron Ores of Missouri," is in- 
teresting, and much of it instructive, especially the discussion of 
the distribution and nature of the ore deposits, which was the 
work assigned to the assistant. Thus far the work seems good. 
The pages treating of the physical geograph}' of the Ozarks arc 
also good. 
That part included between pages 93 and 115, and especially 
that from pages 106 to 115, it would have been much better to 
have omitted. A competent man should have corrected this and 
put it in proper form or else it should have been entirely omitted. 
Now, as these pages reflect upon the accui^acy of the work of oth- 
ers, some of whom have passed beyond the Great River, I feel 
called on to enter a protest. And without reflecting upon any 
other part of the report I feel that I must correct the false impres- 
sion that peradventure might enter the minds of others. 
On p. 96 Mr. Nason informs us that the reasons of the earlj- ge- 
ologists for separating the formations by sandstones are insuffi- 
cient. This seems gratuitous, as he does not give those reasons 
nor has he sufficienth' studied the field to be able to give an opin- 
ion. He dwells on the use of the word "recognize." I do not 
consider that important, for evidently wherever the rocks are 
recognized they are also identified, but it was not considered 
necessary to use that word. He quotes from Shumard's report 
of Franklin, St. Genevieve and Jefl'erson, and yet from his own 
writings we would infer that he had not visited those localities. 
He tries to show that they are incorrect when he himself has not 
seen the rocks. He just seems to deny the correctness of Shu- 
mard's work on general principles. If Mr. Nason made a correct 
study of the iron oi"es, he had no time to devote to the geology of 
such an extensive field as he endeavors to enlighten us upon. 
The great Ozark series Prof. Swallow divided into a succes- 
sion of four limestones, separated bj' certain sandstones. Each 
member was full}- described and afterwards identified by those 
that came after. The author of the Iron Ore report makes the state- 
ment that the first and second sandstones are one and the same, 
