THE CINCINNATI GROUP 35 



Hindia related to Hindia gregaria. In some layers a brachiopod, 

 identified as Leptobolus insig?iis, is abundant and well preserved. 

 This fossil occurs at Cincinnati only in the lower third of the 

 Utica, and it is the presence of Leptobolus ifisignis and Delmaiiella 

 emacerata in the Saltillo limestone which has led to its identifica- 

 tion as equivalent to the Utica. 



In the Wells creek basin, along the railroad southwest of 

 Cumberland City, in northwestern Tennessee, a series of lime- 

 stones interbedded with shaly clays occur which lithologically 

 resemble the Saltillo limestone of southern Tennessee. A slight 

 resemblance is shown also by that part of the Cape Girardeau 

 limestone which is interbedded with shaly clay. The top of the 

 Cape Girardeau limestone belongs to the Silurian. The fossils 

 so far collected from the Ordovician part of the Cape Girardeau 

 limestone indicate merely an age corresponding to the lower 

 part of the Cincinnati group, but whether they are Utica or Lor- 

 raine cannot be determined with the evidence at hand. The 

 Richmond group appears to occur in Jefferson, Warren, and Pike 

 counties, in Missouri, judging from the presence of Di?iorthis 

 subquadrata, Platystrophia acutilirata, and Strophomeiia plamimbona.^ 

 While Richmond group fossils are listed from localities farther 

 south, along the Mississippi, nearer to Cape Girardeau, they are 

 listed together with other fossils which are certainly not of Rich- 

 mond age, suggesting a possibility of incorrect determination. 



2. The Warren limestofie. — If the occurrence of Leptobolus 

 insigfiis is sufificient to refer the Saltillo limestone to the Utica, 

 then the Lorraine has a very limited geographical extent in the 

 Tennessee river valley. At Clifton, above the landing, the north- 

 eastern end of the outcrop of Lorraine has a thickness of three 

 feet four inches. At the old cement mill at the southwestern 

 end of town, its thickness is only a few inches. The Lorraine 

 has not yet been detected elsewhere. This is rather surprising, 

 since Mr. J. M. Nickles states that at Columbia, sixty miles east 

 of Clifton, Mount Parnassus is a noted locality for Lorraine fos- 



'' Missouri Geol.Surv. ,Yo\.Y, 1894; also Shumard, Reports for 1855-71, and 

 Swallow, Reports i and 2, 1855. 



