ILLINOIS. 



129 



Illinois. 



List of the Geological Formations on the Illinois Railroads. 



18 and 19. Cretaceous or Tertiary. 



14 c. Upper Coal Measures. 



14 b. ( Lower Coal Measures and Con- 



14 a. \ glomerate. 



13 a, Low. Carboniferous Limestone,' 



9-12. Devonian. 



5 c. Niagara Group. 

 4 c. Cincinnati Croup. 

 4 a. Trenton and Galena Limestone. 

 3 c. St. Peter's Sandstone. 

 3 a. Calciferous and Lower Magne- 

 sian Limestone. 



* Consisting of the 1. Kinderhook limestone and sandstone, 2. Burlington limestone, 3. Keokuk 

 limestone, 4. St. Louis limestone and 5. Chester limestone and sandstone. 



1. The notes are by Prof. A. H. Worthen, State Geologist of Illinois. 



2. Kich in Niagara corals. 



3. Shelly limestone of Upper Coal Measures filled with fossil shells, bryozoa, &c. 



4. Roof shales of coal rich in fossil plants. 



5. Tipper Chester shales beneath conglomerate with a few fossil shells, corals, &c. 



6. Quarries of St. Louis limestone with some small shells, corals, &c. 



7. A few fossils characteristic of the Galena limestone. 



8. Rich fossiliferous band near the base of the Cincinnati group, and crystals of barite, pyrite 

 and dolomite in pockets of the Galena limestone. 



9. Lower Trenton or Blue limestone two miles northeast of Dixon full of characteristic fossils. 



