546 CHARLES S. PROSSER 



the series, any part will remain to which the original term can be applied by 

 virtue of its distinctive fauna, though it may still serve to designate a facies 

 of the formations mentioned.^ 



Finally, Dr. Ruedeman, after an exhaustive study of the 

 Hudson River beds near Albany, N. Y., has reached the conclu- 

 sion that 



On account of the fact that the mass of beds hitherto called Hudson River 

 shales and correlated with the Lorraine beds of central New York, is com- 

 posed of terranes ranging from the Lorraine to the lower Trenton, and on 

 account of the lack of a fully representative fauna and of a complete section 

 of the Lorraine portion of these terranes, it is proposed to drop the term 

 Hudson river shales, for the uppermost part of the Lower Siluric, and the 

 term Hudson river group, for the Utica and Lorraine beds.- 



Clarke and Schuchert have adopted " Cincinnatian " as the name 

 for the series and period composed of the Utica, Lorraine, and 

 Richmond formations. 3 



This formation was named the " Lebanon beds " by Dr. Orton 

 in 1873 ;'^ but the name was preoccupied, for Professor Safford 

 in 185 1 had applied it to a still older limestone of central Ten- 

 nessee, using it for the two upper divisions of his Stones River 

 group. 5 For the above reason. Professor N. H. Winchell and 

 Mr. E. O. Ulrich in 1897 renamed it the " Richmond group," on 

 account of the excellent exposures at Richmond, Ind.^ 



30. The Trenton limestone is exposed on the northern bank 

 of the Ohio River in Clermont county, particularly in the vicin- 

 ity of Point Pleasant and on the southern bank of the river 

 opposite Cincinnati. 7 The paper just cited by Professor John 

 M. Nickles gives an excellent account of the last four forma- 

 tions of the Ohio scale, as admirably exhibited in the vicinity of 

 Cincinnati and at other localities in southwestern Ohio. 



Charles S. Prosser. 

 Columbus, O., July 3, 1903. 



"■Science, N. S., Vol. X, p. 877. 



^BuU. N. Y. State Mus., No. 42, Vol. VIII (1901), p. 568. 



^Science, N. S., Vol. X (1899), p. 876. 



^Rept. Geol. Surv. Ohio, Vol. I, Part I, p. 371. 



^ Am. Jour. Sci., 2d ser., Vol. XII, pp. 353-55. 



* GeoL Minjt., Vol. Ill, Part II, pp. Ixxxix, ciii. 



Tjour. Cin. Soc. Nat. Hist., Vol. XX (1902), p. 60. 



