ILLINOIS. 



131 



22. Fossil plants abundant in roof shales of coal No. 2. 



23. Limestone of Upper Coal Measures full of fossils. 



24. Fossils in roof shales and limestone over coal No 5. 



25. Fine outcrops of Devonian shale and limestone between these points full of fossils. 

 2<i. Niagara fossils occur sparingly at each of these points. 



27. Fossils abundant in Cincinnati group. 



28. Fossil plants in roof shales of coal No. 2. 



