239 Devonian of Southern Indiana ioi 



shale and Syringothyn's texta is known to occur in those beds 

 at onh' one locality. 



Brachiopods are more abundant than any other class of fossils 

 in both faunas. Of those which have been positively' identified 

 ten are common to the faunas of the Riverside sandstone and the 

 New Providence shale, while twelve species are recorded from the 

 upper fauna which have not been seen in the lower fauna. Rhip- 

 idomdla owc7ii is perhaps the most abundant and characteristic 

 species of the New Providence shale, and the fauna associated 

 with it may be designated as the Rhipidomclla oiveni zone of the 

 Eocarboniferous. 



Applying the same method of nomenclature to the fauna of the 

 Riverside formations it may be called the Rcticularia psciidolineata 

 zone of the Eocarboniferous. 



The distin(5lly Carboniferous character of these two zones is 

 shown in the extreme scarcitj^ of species which occur in the De- 

 vonian and the abundance of Carboniferous types. ProduSlus 

 punclatus and P. se77nrcticulatus which have been found in these 

 faunas are common Coal Measure species. Eiunetria viarryi, 

 which has been found in the Reticiilaria pseiidolineata zone, is a 

 comiuon species in the St. Louis and the Kaskaskia limestones. 



In correlating these faunas with those of the Mississippi series 

 elsewhere it is probably not desirable or pradlicable to consider 

 them separately. The Brachiopods are probably more reliable 

 for this purpose than other groups, since recent studies have 

 cleared up much of the synonomy involved. An examination of 

 the Brachiopods listed in Part III, with reference to their re- 

 corded range elsewhere, shows the following facfls: Eight are 

 reported in the Burlington fauna, twenty-two in the Waverly, 

 fifteen in the Keokuk, five in the Kinderhook, two in the Mar- 

 shall, three in the Coal Measures, one in the St. Louis limestones 

 and one in the Kaskaskia. The ver}^ close relationship discov- 

 ered between the faunas of the Burlington and Keokuk lime- 

 stones at the typical localities lad to uniting the two under the 

 name of Osage b}^ Williams. Keyes has since used the name 

 Augusta for nearly the same beds as tho.se included in the Osage. 

 The figures shown in the above summar}^ seem to point conclu- 

 sively to the equivalence of the faunas of the Riverside sandstone 

 and the New Providence shale to the Osage or Augusta group, 



