112 IOWA ACADEMY OF SCIENCES. 



NOTES AND EXPLANATION OP MAP. 



THE EXPOSURES ARE REPRESENTED BY HEAVY LINES. 



Exposures A R and C. These were cut out of the same ridge in street- 

 grading. The shell-bearing stratum shows well on the east, north and 



Fa I R M U N 7 Pa R K 



A MO 



VICINITY 



Council Blu f fs Ja. 



west sides of C. It is about twelve or fifteen feet thick. Above it there 

 is a layer of clay about fifty feet thick and almost entirely devoid of 



fossils. 



