STATE OF ILLINOIS 



DWIGHT H. GREEN, Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 



FRANK G. THOMPSON, Director 



DIVISION OF THE 



STATE GEOLOGICAL SURVEY 



M. M. LEIGHTON, Chief 

 URBANA 



REPORT OF INVESTIGATIONS — No. 97 



CORALS FROM THE CHOUTEAU AND RELATED 



FORMATIONS OF THE MISSISSIPPI 



VALLEY REGION 



William H. Easton 



PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS 



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URBANA, ILLINOIS <%^^ Ok ^ ♦ 



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