PALEOZOIC FAUNAS OF MISSOURI 
35 
UPPER PALEOZOIC FAUNAS OF MISSOURI ^ 
By Henry S. Williams 
During the years 1889 and 1890, fossils have been collected 
by Mr. W. P. Jenney, Mr. Janies D. Robertson and Mr. Gilbert 
Van Ingen from numerous localities in the western half of Mis¬ 
souri, south of the Missouri river, and have been sent to me for 
study. I have made preliminary examination of them; and I have 
also had collections from northern Arkansas and other adjoining 
states for comparison. 
'During the month of August, 1890, I made a hasty examina¬ 
tion of the strata around the south-western border of the Ozark 
uplift, from Batesville to Eureka Springs, Arkansas, and thence 
across Missouri as far as to Sedalia. 
At the present time I am able to present a few general facts 
resulting from these studies, leaving, however, the details until 
more thorough investigation shall be made. 
I have indicated in the classification proposed the positions in 
the geologic column where, upon, palaeontologic grounds, the 
sharper lines of delimitation are to be drawn. 
The formations about the southern and western margin of the 
Ozark uplift are sharply divided into two terranes, one. Lower 
Palaeozoic, and the other. Upper Palaeozoic. 
(a.) The Silurian formations, which for most of the region 
are Lower Silurian, rarely reach higher than the lower formation 
of the Upper Silurian. 
1 This article was originally prepared by Professor Williams" for Bulletin No. 3, 
of the Missouri Geological Stirvey, published in 1890. After it was set up in type 
and in page form there arose some differences of opinion regarding terminology and 
Mr. Winslow, then State Geologist, at the last moment refused to publish it, and it 
was withdrawn. Since this is Professor Williams’ first outline of his proposed changes 
in the groupng of the Early Carbonic terranes of the Mississippi Valley, after his 
review of the life zones, and as many of the points therein illuminated are little 
considered by later writers on the subject its publication, even after an elapse of 30 
years, seems worth while in order to clarify somewhat these moot points. As will 
be noted, the paper discusses a number of features not mentioned by the author in his 
subsequent writings.— Ed. 
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