626 STUART WELTER 



the Louisiana Limestone with beds No. 2-4 at Burlington is afforded 

 by the identity of the faunas of the superjacent beds in both regions. 

 The fauna of beds Nos. 5 and 6 are modifications of one and the 

 same organic assemblage, which exhibits characteristics totally differ- 

 ent from those of the faunas below. This fauna of the upper beds 

 of the Kinderhook section at Burlington is characterised by such 

 genera of pelecypods as Macrodon, Palaeoneilo, Promacrus, and 

 Crenipecten, and by the brachiopods Chonetes logani, Lepaena rhom- 

 boidalis, and Spirijer sp. allied to S. marionensis, but distinct from it. 

 The whole expression of the fauna is entirely different from that of 

 the beds below. In the vicinity of Louisiana this same fauna of 

 the upper beds at Burlington is well exhibited in the yellow, 

 vermicular, arenaceous beds near the summit of the Hannibal Shales, 

 which overlie the Louisiana Limestone. 



At Kinderhook the conditions are somewhat different, no evidence 

 of the presence of the higher fauna having yet been found. At this 

 locality the fine-grained limestone bed is apparently followed imme- 

 diately by the typical Burlington Limestone, bearing the typical 

 fauna of that horizon. 



In tracing the further distribution of the fauna of the yellow sand- 

 stone of Kinderhook and Burlington, it is found to occur 60 miles 

 northwest of Burlington, in Washington County, Iowa, at Maples' 

 Mill on English River, near Wellman. At this locality a yellow 

 sandstone similar to that at Burlington has been called the "English 

 River Grit'-' by Bain. 1 The fauna of this bed is rather extensive, 

 and contains the following species: 



1. Scalarituba missouriensis Weller. Some portions of this Sand- 

 stone are perforated by meandering burrows with transverse 

 concave ridges which are in every way similar to those in the 

 Hannibal and Northview Sandstones of Missouri. 



2. Orthothetes sp. The specimens of this genus from the English 

 River Grit are larger and more numerous than those of the 

 Chonopectus Sandstone at Burlington. They may perhaps be 

 identified as O. chemungensis Hall; at least they are closely 

 allied to that New York Devonian species. 



1 American Geologist, Vol. XV, p. 322; Iowa Geological Survey, Vol. V, p. 134. 



