227 Devonian of Southern Indiana 99 



recognition as the sole representative of the Kinderhook fauna 

 in Indiana. 



The Rockford fauna, which has heretofore been known only at 

 Rockford, has been found in Jennings count}' and in the southern 

 part of Scott county sonie thirty miles south of the original lo- 

 cality. The three or four feet of limestone to which it is con- 

 lined contains at most localities very few or no fossils. The 

 l^ockford limestone, which is a persistent formation in southern 

 Indiana, has not been seen south of the Ohio, and no trace of its 

 fauna has been found in Kentucky. The Rockford limestone 

 evidently disappears by thinning toward the south and is repre- 

 sented in the Kentucky sections by the greenish blue argillaceous 

 New Providence shale. These argillaceous shales have been 

 found at one point thirty miles south of Louisville to be separated 

 from the Black shale by a few feet of shelh^ limestone. This 

 limestone, which holds the same stratigraphic position as the 

 Rockford limestone, was found to contain a fauna typical of the 

 New Providence shale, no trace of the Rockford fauna appearing 

 in it. The three species which were found abundantly here are 

 Rhipidornella oiverii, Spirifer mortoiiamts, and Spirifo' siiborbiac- 

 laris. These fossils are found at nearly ever)^ locality where fos- 

 sils occur in the New Providence shale, while the}' have never 

 been found in the Rockford fauna. We have therefore conclusive 

 evidence that the Rockford fauna and the New Providence fauna 

 were contemporaneous and existed side by side over a portion of this 

 area at the end of the Black shale epoch. Much more detailed infor- 

 mation concerning the faunas succeeding the Black shale through- 

 out the Mississippi valley is needed before a final and satisfactory 

 correlation of the Rockford fauna in other states can be made. 

 The field work of the writer has shown that the fauna is absent 

 from the Kentucky secftions and that the lower part of the New 

 Providence shale is the stratigraphical equivalent of the Rockford 

 limestones in Kentucky. From the local charadler of the fauna 

 in this area we may fairly expedl to find it absent and its interval 

 represented by another fauna in some of the other states of the 

 Missis.sippi valley. The writer cannot agree with Meek and 

 Worthen's correlation of the Rockford limestone with the Chou- 

 teau limestone for reasons stated in reviewing that correlation. 

 The evidence there cited seems to indicate the parallelism of the 

 Louisiana limestone of Missouri with the Rockford limestone. 



