THE STRUCTURE OF THE FORT DODGE BEDS * 
JAMES H. LEES 
Much has been written regarding the geologic position and the 
stratigraphic relations of the gypsum and associated strata which 
are present near Fort Dodge and many are the speculations which 
have been put forward to account for the peculiar conditions ob- 
taining. Observers early discovered that the gypsum was not in 
Fig. 1. Map of the Fort Dodge region, showing the locations of the three series 
of sections in Plate II. 
1. Old pit of Fort Dodge Clay Works. 2. Exposure in Hawkeye Highway. 3. Pit 
of Fort Dodge Brick and Tile Co. 4. Pit of Hawkeye Clay Works. 5. Exposure 
in Soldier creek valley. 6. Well in sec. 12, Cooper township. 7. Well at County 
Farm. 8. Mine of Plymouth Gypsum Co. 9. Pit of Bradshaw Clay Co. 10. Pros- 
pect holes in Sec. 27 , Cooper township. 11. Well in Sec. 24, Coioper township. 
12. Exposure at end of ridge between Des Moines and Soldier valleys. 13. Pit of 
Vincent Clay Products Co. 14. Pit of Johnson Brothers Clay Co. IS. Pit of Ply- 
mouth Clay Co. 
* Published by permission of the Director of the Iowa Geological Survey. 
