STIRATIGIRAVPIENY Qe Walls, SAUNT ILQWS AND WARSAW 
FORMATIONS IN SOUTHEASTERN IOWA." 
CONTENTS. 
Introduction. 
Earlier descriptions. 
General description of the region. 
Stratigraphy. 
Geological structure. 
Description of sections. 
Correlation. 
Characteristics of the formations. 
The Warsaw shales and limestones. 
The Warsaw arenaceous beds. 
The brown magnesian limestone. 
The compact gray limestones. 
The granular limestone. 
The Keosauqua sandstone. 
Unconformities. 
Unconformity below the Saint Louis. 
Unconformity above the Saint Louis. 
Origin of the brecciated character of the Saint Louis limestone. 
Dolomitization. 
INTRODUCTION. 
THE stratigraphic relations of the Saint Louis and Warsaw 
groups in southeastern lowa have not hitherto been satisfactorily 
established. The beds succeeding the geodiferous shales of the 
Keokuk group, first erected into an independent group—the 
Warsaw—by Hall in 1858, have been included in the Saint 
Louis group by some writers, while others have referred them to 
Bie Ncolminne TOM amcareLilN SURVeV Ob tne) Mteratune sites 
evident that much of the confusion attending our knowledge of 
these rocks has arisen from discordant conclusions derived from 
investigations within the area covered by this paper. As these 
differences appear to have arisen chiefly from the variable char- 
acter of the Saint Louis limestone, special attention was given to 
t Published with the permission of the state geologist of lowa. 
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