UPPER CARBONIFEROUS OF IOWA 
273 
THE PALEONTOLOGY AND STRATIGRAPHY OF THE 
UPPER CARBONIFEROUS OF IOWA. 
GEO. L. SMITH. 
The object of this paper is to give the results of field observa- 
tion and paleontologic study of the Upper Carboniferous of 
southwestern Iowa, extending over several years, as opportunity 
offered. It has been necessary that portions of the adjacent 
states of Missouri and Nebraska be included in this investiga- 
tion, to complete and confirm the results obtained by studies of 
the stratigraphy of Iowa. Good exposures of outcrops in Iowa 
are infrequent and widely scattered; correlations are therefore 
difficult to make without the information to be derived from the 
examination of outcrops in adjacent territory. 
As the result of his investigation of the stratigraphy in this'^ 
geological field, the writer has been convinced of the accuracy 
of the General Section of the Strata Exposed on the Missouri 
River,” by J. E. Todd in his paper '‘Soine Varient Conclusions 
in Iowa Geology,” published in ‘‘Proceedings of the Iowa 
Academy of Science,” Vol. XIII, page 183. All the outcrops 
examined by the writer can be easily correlated with this general 
section. Todd ’s long familiarity with the geology in this field 
enables him to interpret correctly the stratigraphy of this por- 
tion of Iowa. This section is the type section with which all 
other sections will be compared. 
As far as possible sections of natural outcrops will be given, 
correlated and combined with each other and the type section. 
These sections are selected from many others as the most adapted 
to give the true Sequence of strata. They will be given, com- 
mencing with the lowest strata and following each other in order 
until th highest strata east of the Missouri river are included. 
“GENER IL SECTION OF THE UPPER CARBONIFEROUS ROCKS 
OF IOWA.” 
J. E. TODD. 
N Feet 
16 Blue, red and ash-colored clays with two layers 
of limestone, two and four feet thick 19 
16. Veiiow micaceous sandstone 10 
11. D^ah, ash, lead and chocolate-colored clays or 
shales with a thin limestone layer 
39 
