FORMATIONS IN SOUTHEASTERN IOWA. 295 
Excellent exposures of the Saint Louis limestones occur at 
various localities on East Sugar Creek: 
III. EAST SUGAR CREEK SECTION. 
1. Compact light gray limestone; breaks with conchoidal fracture, —- 3! 
2. Light brown friable sandstone, - - - - TOL 
3. Compact fine-grained limestone, - - - - 1 
4. Friable calcareous sand, - - - - - - Io’ 
5. Brecciated limestone ; fragments, mostly of light-colored compact 
limestone well cemented by similar calcareous material, —- 2 its" 
6. Brown magnesian limestone, slightly arenaceous in places; some- 
what thick and irregularly bedded; contains lenticular masses of 
brecciated limestone similar to No. 5, - - - ce TO! 
7. Blue arenaceous shale; includes fragments of chert and siliceous 
limestone, - - - - - : 2 - 6' 
55 
This section occurs on the branch of East Sugar Creek flow- 
ing through West Point township. The brecciated limestone is 
rather coarsely stratified, and appears smooth and waterworn in 
places. At one point a looser aggregate of the same character 
occupies what appears to be a channel eroded in the more com- 
pact breccia. The lenticular masses occurring near the base of 
the magnesian beds do not differ essentially from the main mass 
of the brecciated rock. Near the top of the magnesian beds, 
however, the lenticular masses are composed, in part, of frag- 
ments resembling the brown magnesian limestone itself. At 
Graner’s quarry in the N. W. &% Sec. 30, T. 68 N.,R. 5 W., the beds 
above the brecciated limestone are represented by sixteen feet of 
coarse granular limestone, or calcareous sand rock, cross bedded 
and prominently ripple marked. Beneath the granular limestones 
there are about eight or ten feet of brecciated limestone followed 
downward by the same thickness of brown magnesian limestone. 
A shaft and drill hole penetrated thirty feet of shale below this 
bed, the upper ten of which was destitute of geodes and appar- 
ently represents the Warsaw shales. 
One-half mile southwest of the quarry the granular limestones 
are replaced by fine compact gray limestone containing more or 
less nodular chert. 
At asmall quarry one and one-half miles south of Donnellson, 
