GEOLOGY OF SOUTHWESTERN IOWA 85 



Two miles southwest of Stennett on the Red Oak wagon road 

 and one-fourth mile from a coal prospect tunnel the following 

 is seen in outcrop : 



FEET 



2. Sandstone, yellow, friable 5y 2 



1. Limestone, gray 3 



The sandstone number two is the same as that exposed in 

 the quarries east of Haynies, and immediately underlies the 

 blue shale, number one in the section west of Stennett. 



COMPOSITE SECTION OF DIFFERENT OUTCROPS IN THE 

 VICINITY OF STENNETT. 



FEET 



Limestone, gray, two layers 2 



Shale, black 3 



Shale, gray, calcareous 5 



Limestone, gray, one layer 2 



Shale, gray, calcareous 2 



Limestone, gray, one layer V/ 2 



Shale, buff and gray 3% 



Limestone, variable 17 



Shale, gray 1 



Shale, black, carbonaceous 1% 



Shale, gray, calcareous 2 



Shale, blue 4 



Sandstone, yellow, friable 5% 



Limestone, gray .' 3 



The late Doctor Calvin maintained that the strata in south- 

 western Iowa below the Nyman coal were abyssal sea deposits; 

 those above this coal mostly marginal, as shown by spheroidal 

 lumps in the limestones and ripple marked sandstones ; also that 

 the Nodaway coal was formed in a marine swamp, as the bottom 

 and roof shales of this coal have an abundant marine fauna. A 

 careful search has been made for fossils of the Lingula group, 

 as these are good evidence of shallow water deposits, with the 

 result that only a few doubtful forms have been discovered. The 

 upper limestone above the cap rock of the Nyman coal not being 

 a constant horizon it is thought best to leave it unnamed, as it 

 can not be identified in the state of Missouri, within a few miles 

 of the Iowa state line. 



