148 



AN AMERICAN GEOLOGICAL RAILWAY GUIDE. (IOWA.) 



Iowa.* 



LIST OF THE GEOLOGICAL FORMATIONS FOUND IN IOWA : 



20. Bluff Deposit, Post Tertiary. 



20. Glacial Drift. 



1 8 a, Lower Cretaceous. 



14c. Upper Coal Measures. 



14b. Low. Coal Mrs. (producing Coal.) 



14 a. Millstone Grit. 



1 3 b. Upper Sub-Carboniferous. 



13 a. Lower Sub-Carboniferous. 



10 b. Hamilton. 

 5 c. Niagara. 

 4 c. Cincinnati. 

 4 b. Galena Limestone. 

 4 a. Trenton. 

 3 b. St. Peter's Sandstone. 

 3 a. Lower Magnesian Limestone. 

 2 b. Potsdam. 



Chicago, Milwaukee & St. Paul R. R. Con. 

 Ms. | Mason City and Austin Division. 



Illinois Central Railroad. 



Iowa Division. 



ODubuque. 

 10'Julien. 

 15Peosta. 

 23 Farley. 

 29 Dyersville. 

 37Earlville. 

 41 Delaware. 

 47 Manchester. 

 54 Masonville. 

 61jWinthrop. 

 69,Independence. 

 78 Jesup. 



4 b. Galena limestone. 



u 



tt 



5 c. Niagara. 



10 b. Hamilton. 



93Waterloo. 

 98|Jn.C.F.&M.RR 



99 Cedar Falls. 

 109 New Hartford. 

 HSParkersburg. 

 123'Aplington. 

 132Ackley. 

 143 Iowa Falls. 

 149 ! Alden. 

 158, Williams. 



172 Webster City. 



192 Fort Dodge. 

 210Manson. 



13 a. Low. Sub-Carbon. 



j 



{& 14 b. L. Coal Mrs. 

 1 1 



20. Glacial Drift. 



* Prepared by Dr. C. A. White, late State Geologist of Iowa. 



