Weller — Kinderhook Faunal Studies. 207 



Spirifer marionensis, Spirifer peculiaris^ Reticularia cooper- 

 ensis, Pernopecten cooperensis, Promacrus cuneatus and 

 Phanerotinus paradoxus^ are more or less common in the 

 faunas of the typical Chouteau limestone of central Missouri, 

 or in those of the same age in southwestern Missouri. 



The correlation of the upper yellow sandstone at Burling- 

 ton with some portion of the typical Chouteau limestone of 

 central Missouri is assured by the paleontological evidence. 

 Bed No. 6, the oolite limestone, also carries a Chouteau lime- 

 stone fauna. The fauna is closely allied to that of the sub- 

 jacent bed No. 5, but lacks the pelecypod element which con- 

 stitutes so large a portion of that fauna. The only common 

 pelecypod in the fauna is Pernopecten cooperensis, which is 

 ulso present in bed No. 5, and which is a common form in 

 some of the beds of Chouteau age in central and southwest- 

 ern Missouri. , Ohonetes logani, a common species in the 

 fauna, is also present in the Sac limestone of southwestern 

 Missouri, and is possibly identical with Ohonetes ornatus of the 

 typical Chouteau limestone. Productus arcuatus and Pro- 

 ductella concenirica are both well represented in the faunas of 

 Chouteau age in Missouri. /Spirifer marionensis, one of the 

 commonest species of the fauna, is abundant in the typical 

 Chouteau faunas, and is also one of the most characteristic 

 species of the Louisiana limestone fauna. 



In bed No. 7, some species, such as Productus punctatus and 

 Camarophoria caput-testudinis, are introduced, which point 

 forward to the followinoj Osage faunas. Several of the other 

 species in the fauna pass up from the beds below, and others are 

 restricted to this bed in the Burlington section. BJiynchonella 

 persinuata is closely allied to, and is possibly not distinct 

 from Rhynchonella cooperensis oi the typical Chouteau fauna 

 of Cooper County, Missouri. This same introduction of 

 Osage forms is noticeable in the upper beds of Chouteau age 

 elsewhere, especially in the Pierson limestone of southwestern 

 Missouri. 



The paleontologic evidence points definitely to the approxi- 

 mate correlation of beds 5, 6, and 7 of the Burlington sec- 

 tion, with the Chouteau limestone of central Missouri, and 

 with the three formations known as the Sac limestone, the 



