KINDERHOOK FORMA TIONS OF MISSOURI I 3 I 



lithologic facies of the Sac limestone. The strict correlation of 

 the formations called Louisiana limestone, Hannibal sandstone 

 and shale, and Chouteau limestone with the formations recog- 

 nized under these names in the central and northeastern portion 

 of the state cannot be sustained, as will be shown in the follow- 

 ing pages, and in the present paper the names Northview sand- 

 stone and shale and Pierson limestone will be substituted for 

 Hannibal sandstone and shale and Chouteau limestone. 



The four lowermost of the formations in the preceding list, 

 were referred by Shepard to the Devonian, but in view of the 

 well defined Kinderhook faunas that are present in the Eureka 

 shale and the Sac limestone, such a correlation cannot be sus- 

 tained. 



Eureka shale. — This formation has been recognized by Shep- 

 ard in but few localities in the area covered by his map, and is 

 restricted, for the most part, to the southwestern portion of the 

 region where it attains its maximum thickness. Outside of this 

 portion of the area, a few inches of shale have been recognized 

 at several localities lying above the magnesian limestones, which 

 are referred to this formation. Near Frazer's, at the chief local- 

 ity for the Eureka shale cited by Shepard, the following fossils 

 were collected by the writer : 



i. Lingula sp. cf. L. siibspatulata M. & W. 



2. Orbiculoidea sp. undet. 



3. Chonetes sp. cf. C. logani N. & P. or C. ornatus Shum. 



4. Ambocoelia flarva Weller, 



5. Phyllocarid crustacean. 



6. Fish scales ? 



The most common fossils in the fauna are the Lingulas, in 

 this respect simulating the Eureka shale fauna of northern 

 Arkansas which has been described by Williams. 1 Orbiculoidea 

 is not recorded from Arkansas by Williams, although there is no 

 reason why the genus should not be present in the Eureka shale 

 of that state. The Chonetes found at Frazer's is evidently iden- 

 tical with one of the species of this genus recorded by Williams, 



1 Am. Jour. Sci. (4), Vol. VIII, pp. 139-152. 



