CORRELATION 323 



members of the Lower Burlington fauna. Such species are Leptcena 

 rhomb oidalis, Schizophoria swaMovi, Rhipidomella michelinia, Chonetes 

 illinoisensis, Spirifer grimesi, Athyris lamellosa, and Cliothyris incras- 

 sata. Other members of the Fern Glen fauna, especially among the 

 crinoids, have close relatives among the Lower Burlington species, and in 

 a few cases are, or seem to be, identical as in the case of Synbathocrinus 

 dentatus, Vasocrinus cf. macropleurus, Metichthyocrinus cf. burlington- 

 ensis, and Coelocrinus cf. ventricosus. 



From the evidence presented, therefore, it is clear that while the Fern 

 Glen may still be included in the Kinderhook as a contemporaneous for- 

 mation with the highest, non-typical portion of the Chouteau limestone, 

 it represents the closing stages of the Kinderhook, and in its fauna is 

 foreshadowed the beginning of the succeeding life of the Lower Bur- 

 lington. 



THE SAINT JOE MARBLE 



The Saint Joe marble is a pink or reddish limestone with a wide dis- 

 tribution in northern Arkansas, lying immediately beneath the Boone 

 chert formation. The color of the Saint Joe is essentially identical 

 with that of the Fern Glen formation in its typical condition, and the 

 more calcareous parts of the Fern Glen are indistinguishable in hand 

 specimens from the Saint Joe. The most complete records of the fauna 

 of the Saint Joe marble have been given by Williams. 9 The identifica- 

 tions in these lists are in some cases now known to be incorrect, but thev 

 give a good idea of the composition of the fauna. Faunal lists from 

 eight localities are given which are combined in a single list given below 

 on the left, the number following each name indicating the number of 

 localities from which the species has been recorded in Arkansas. The 

 list on the right, here given, indicates the Fern Glen species which are 

 identical with or represent the Arkansas forms. In a number of cases 

 the same species has been recorded in Arkansas under two or more 

 names; these are indicated in the table by the use of brackets. 



In the table (page 324) the Fern Glen species mentioned are in every 

 case specifically identical with the corresponding Saint Joe marble forms, 

 except Camarot 03 chia persinuata and Spiriferina subtexta, and these two 

 also are possibly identical. With one exception only, Pugnax acumin- 

 atus, every one of the Saint Joe species not represented in the Fern Glen 

 are either incompletely or questionably identified. The species in the 

 Saint Joe marble which occur in three or more localities are as follows : 



9 Annual Report of the Arkansas Geological Survey, 1892, vol. 5, Lead and Zinc, pp. 

 331-334. 



