172 



Tlie fft/draulic Beds, etc.. 



Upper limestone. 



Coralline limestone. < 



In 1847 Messrs. Yandell and Shumard published the 

 following table of the formations at the Falls of the Ohio, 

 as determined bj Dr. Clapp of !N'ew Albany : 



Subcrvstalline limestone, 8 ft., 

 Water limestone, . . . 12 ft., =20 ft. 



f Subcrystalline limestone, with many 

 Shell limestone, <[ characteristic shells and trilobites, 



and a few corals, 16 ft. 



Upper Coralline, to Catenipora[beds], 

 composed mostly of corals, and des- 

 titute of shells .... 20 ft. 

 Lower Coralline, corals mostly 

 different from those above, 

 and very few shells ; the up- 

 per part alone visible on the 

 Falls, 20ft.,=40ft. 



They also describe these several beds, giving certain 

 fossils in each as determined by them. They recognize 

 the lower beds as equivalent to the Niagara group of Xew 

 York, and cite several species of fossils as identical with 

 the I^ew York forms. The beds above, with their fossil 

 contents, are treated in some detail, and the waterlime is 

 described as resting on the Pentremital stratum, bearing 

 Fentremites {= Olivcmites = Nucleocrinus) VerneuiU. The 

 waterlime is represented as covered by a siliceous bed 

 containing Chonetes, Loxonema, " a small Orthoceratite," 

 etc., and immediately above this comes a granular lime- 

 stone which contains numerous species of Encrinites and 

 a few corals and shells. [From these, and from other ob- 

 servations of earlier and later date, the limestones of the 



sent the deposits and the fauna of a changed condition of the ocean bed 

 supervening the coral growing period, and are entitled to recognition in 

 any critical subdivision of the series. 



