582 P. E. RAYMOND TRENTON OF TENNESSEE AND KENTUCKY 



tmuous deposition, unaffected by the conditions which introduced the 

 mud into the more northern Eden, and that it was the region in which 

 the Maysville fauna originated and from which it spread northward at 

 the end of Leipers time. 



If this contention can ultimately be established, as I do not pretend to 

 do more than suggest the idea now, then central Tennessee was one of 

 those districts to which animals retired when driven from their earlier 

 environment by physical changes and from which they emerged to re- 

 populate later seas. It was. in fact, an asylum for a recurrent fauna. 

 Dr. ITlrieh has already commented upon the Catheys fauna as of the re- 

 current type, and called attention to the fact that it really is a combina- 

 tion of two faunules, one consisting of corals and hydrocorallines (Strep- 

 telasma, Tetradiuni, Columnaria. and Stromatocerium) and the other 

 of bryozoa and shells. 12 It should be noted that in the correlation of the 

 Leipers fauna with that of the Fairmount the first of these elements has 

 to be neglected, and this seems a very important point. If the Leipers 

 received its fauna from the Catheys, the presence of numerous corals is 

 readily understood. The real Fairmount could not have supplied them. 



The coral faunule, so far as Columnaria and Tetradium are concerned, 

 is autocthonous in Tennessee. These genera occur in various subdivi- 

 sions of the Stones Eiver as high as the Carters, then disappear from the 

 central basin during the Hermitage and Bigby, although I have no doubt 

 that they are in the Cannon (Tetradium is present in the "Bigby Dove"), 

 reappear in the Catheys and Leipers, and thence pass into the Arnheim. 

 and so to the Eichmond. Although not yet proven present in every 

 formation and necessarily migrants during the uplift at the end of the 

 Lowville or Leray, these corals seem to have had their distributional 

 center in this area. 



To summarize what has been said above, it is argued that the Catheys 

 and Leipers are the equivalent of the Cynthiana, Million, and Lower 

 Maysville in Kentucky and the Cpper Trenton, Eden, and Lower Mays- 

 ville about Cincinnati, because : 



1. Lithologically, there appears to have been continuous sedimenta- 

 tion throughout Catheys and Leipers time. 



2. The fauna of the Leipers is a derivative of that of the Catheys. 



3. Certain of the species of the Catheys show a direct evolution into 

 the species found in the Leipers. 



4. The Leipers is not a pure Maysville fauna, but contains elements 

 indigenous to the region it occupies. It was, therefore, emigrant and 

 not immigrant. 



