MISSISSIPPIAN OF PHELPS COUNTY, MISSOURI 565 



genus Cyathaxonia is abundantly represented in the Fern Glen 

 fauna, and Platycrinus and Rhipidomella also occur. Camaro- 

 toechia tuta and Ambocoelia levicula are both found in the Lower 

 Burlington limestone, while Reticularia cooperensis appears to be 

 a survival from the late Kinderhook. The relationships of this 

 fauna are so definite that there is no hesitation in calling it the 

 equivalent of the Fern Glen fauna. 



A somewhat younger fauna has been obtained from a number of 

 quartzitic bowlders, and the faunas of the four best bowlders con- 

 taining this fauna have been combined to form the list given in 

 Table I. 



A comparison of the four faunas listed (p. 566) shows that 

 they are closely related. Only one species is common to all four 

 faunas, but three species are common to faunas Nos. 3 and 5, seven 

 to faunas Nos. 31 and 5, five to faunas Nos. 17 and 5, etc. The 

 bowlders in which these faunas were contained were all small, and 

 this would partially account for some of the diversity. 



The affinities of these faunas are with the Burlington rather than 

 with the Kinderhook. Many of the species are common to the 

 Upper Kinderhook and the Lower Burlington, and recent work 

 has suggested that some beds which have commonly been referred 

 to the upper part of the Kinderhook are more nearly related to the 

 base of the Burlington. This fauna is not the equivalent of the 

 Fern Glen fauna just described; neither is it the exact equivalent 

 of the fauna of the Burlington White Chert from Louisiana, Mis- 

 souri, but appears to be intermediate between the two. Very 

 few faunas have been described from this horizon, and, until more 

 definite work is done on this portion of the Mississippian, a more 

 exact correlation cannot be made. 



The faunas of the eight bowlders listed in Table II have much 

 in common, and undoubtedly are from a common horizon. 



Of the 72 forms listed in Table II, 50 are found in the Burling- 

 ton of various localities, and at least 1 1 more occur in the Fern Glen 

 and in beds of equivalent age. A few forms hitherto reported 

 only from the Upper Kinderhook and Chouteau — Chonophyllum 

 sedaliense, Reticularia cooperensis, Productus blairi, and Hustedia 

 circularis — are also recorded. Some of these are definitely identified ; 



