Weller — Kinderhook Fanned Studies. \23 



therefore the species is placed in that genus. Heretofore this 

 genus has been recognized only in the Devonian, and in 

 America, at least, at no higher horizon thau the Middle 

 Devonian. 



Correlation. 



Attention should again be called, at this point, to the diverse 

 and local character of the lithologic formations and of the 

 faunas of theKinderhook epoch. It is not possible, as has been 

 the usual custom, to recognize three constant divisions of the 

 Kinderhook, either lithologic or faunal, well defined through- 

 out the whole area in Iowa, Missouri, and Illinois, occupied by 

 the rocks of this age. The names Louisiana limestone, Han- 

 nibal shale, and Chouteau limestone, cannot be applied to all 

 the Kinderhook formations throughout the area, and as inves- 

 tigations are prosecuted in various localities, other local 

 formation names will have to be introduced. 



No satisfactory correlation of the Kinderhook beds at Bur- 

 lington with those of Illinois and Missouri, has yet been made. 

 Keyes* has referred nearly the whole of the section at Bur- 

 lington to the Hannibal shales of Northwestern Missouri, but 

 his basis for this correlation seems to have been chiefly the 

 lithologic similarity. It is far more probable that the section 

 at Burlington is equivalent, or more thau equivalent, to the 

 whole of the section as known in Missouri. On lithologic 

 grounds alone, bed No. 4 (Weller) at Burlington, might well 

 be considered as a northern extension of the typical Louisiana 

 limestone of Missouri, reduced in thickness. In both locali- 

 ties the rock is a fine-grained, compact, fragmentary lime- 

 stone, though at Burlington its fragmental character is more 

 pronounced and more irregular than at Louisiana. Fossils 

 are not abundant in this bed at Burlington, so that an entirely 

 satisfactory comparison of the faunas cannot be made. 

 However, the species of Syringothyris which occur at the 

 two localities, seem to be identical, although the Burlington 



* Geol. Surv. Iowa. 1 :55. (1893.) 



