SOG E. O. ULRICH CORRELATIONS OF CHESTER FORMATIONS 



Page 

 Upper Ohara fossils in Sainte Genevieve limestone south of 



Somerset, Kentucky £43 



The section near Huntsville, Alabama 844 



Species and geographic distribution of the Upper Ohara crinoid 



fauna 847 



Age of the crinoid bed near Burksville, Illinois S4S 



Conclusions 851 



Introduction 

 general statement 



It is with regret tand aversion that I return to the discussion of a sub- 

 ject on which I had hoped my last word had been written four years ago. 

 Indeed, I would not do so if it were merely to continue the "Chester 

 controversy" that began ten years ago, when Prof. Stuart Weller sub- 

 mitted a manuscript report on stratigraphic investigations in western 

 and southern Illinois carried on by him under cooperative arrangements 

 between the U. S. Geological Survey and the Illinois Geological Survey. 



The author of the manuscript refused to accept my classification of 

 the Chester series 2 because he found it inapplicable to the Illinois section 

 and erroneous in certain important respects. Following epistolary dis- 

 cussion of the disputed matters, we spent about a week of 1913 in a rapid 

 review of the concerned areas in Illinois and Kentucky, accompanied by 

 Mr. H. A. Buehler and Mr. Frank W. De Wolf, the State Geologists of 

 Missouri and Illinois respectively. 



This field conference proved me in error in correlating the main body 

 of Chester limestone in Randolph County, Illinois, to which Weller sub- 

 sequently applied the name Okaw limestone, with the Kentucky forma- 

 tion which I had described under the term Tribune limestone. It was 

 found that the Okaw limestone is the younger of the two. We found also 

 that the limestone at Tribune, in Crittenden County, Kentucky, is not 

 at all the formation that I had in mind and described under that name 

 from outcrops in Caldwell and Christian counties. But this conclusion 

 merely corroborated what I had learned about the limestone at Tribune 

 two or three years before 1913. 



MISCORRELATIONS OF THE CYPRESS SANDSTONE 



However, the main reason for our 1913 field conference concerned the 

 age of the massive sandstone at Rosiclare, Illinois, and at various places 



2 U. S. Gcol. Survey, Prof. Paper 36, 1905. 



