314 ANNALS NEW YORE ACADEMY OF SCIENCES 



Glen Park can be paralleled in the Hamilton formation of New York, 

 while only six species have parallel forms in the Chouteau limestone of 

 Missouri. Although the Chouteau fauna is so near at hand, he is able 

 to find specific identity in only two species and those are Schuchertella 

 chemungensis and Tropidodiscus cyrtolites. When we consider this fact 

 and that the fauna comprises such Devonian genera as Eunella, Atrypa, 

 Nucleospira and Delthyris, not to mention the fish Ptyctodus eastmani, 

 it would seem that the Devonian proclivities of the fauna far outweigh 

 the Carboniferous ones, even with due consideration for the two doubt- 

 fully identified crinoid genera. This evidence is largely neutralized, 

 however, when other factors are taken into consideration. 



The Kinderhook faunas of the upper Mississippi Valley show local 

 facies to an almost unprecedented degree. To some extent, this differ- 

 entiation may have a zonal explanation, but it is also probably local and 

 environmental, since the lithologic character of the beds is also extremely 

 variable. Professor Weller recognizes a northern and southern type of 

 Kinderhook fauna which were contemporaneous, but almost entirely dif- 

 ferent. The Chouteau limestone exemplifies the southern fauna and 

 with this, as just noted, the Glen Park fauna has only two species in 

 common, although Professor Weller apparently regards them as occupy- 

 ing the same horizon. Both the northern and the southern faunas are 

 also highly diversified. 



Beneath the fauna of the oolite at Hamburg, referred to above, which 

 so closely resembles that of the Glen Park limestone, there is another 

 having a considerably different facies. The latter Professor Weller cor- 

 relates with the well-known fauna of the Louisiana limestone and this 

 in turn with the typical Kinderhook of that ilk, which corresponds to 

 the lower and larger portion of the Kinderhook section at Burlington* 

 On the other hand, he correlates the fauna of the oolite at Hamburg 

 with the Glen Park fauna and the Glen Park fauna with the Chouteau 

 fauna, and with the upper part of the Kinderhook section at Burlington, 

 if I understand him aright. 



Several very different facies are presented by these faunas. That of 

 the Louisiana limestone (at Louisiana, Missouri, and Hamburg, Illinois) 

 is distinctly more Carboniferous than that of the oolitic limestone at 

 Hamburg and Glen Park, which, as already noted, are rather conspic- 

 uously Devonian, though they occur above the other in stratigraphic 

 position. The faunas of the Chouteau limestone and the topmost Kin- 

 derhook at Burlington, with which the faunas of the oolitic limestone at 

 Glen Park and Hamburg appear to correlate, are still more conspicuously 

 Carboniferous, and they have so been recognized for a long time. 



