NOMENCLATURE OF THE OHIO FORMATIONS 54 5 



of the Lower Silurian rocks exposed along the Cumberland 

 River in southern Kentucky, as apparently equivalent to the 

 Madison beds ; but in a late paper he states that the term 

 Cumberland sandstone includes a much larger series of rocks 

 than the name Madison bed.' Finally he gives his opinion 

 "that the major part of the rock designated as the Cumber- 

 land sandstone by Professor N. S. Shaler must have been of 

 Lorraine age, and if any part of the Richmond is to be included 

 under this name, this is due rather to accident than to the 

 original intention of the author."^ In this paper Dr. Foerste 

 recognized that the name Madison was preoccupied and stated : 



It is therefore considered desirable to change the name of the beds at 

 the top of the Richmond, hitherto called the Madison beds ; the name 

 Saluda bed is therefore introduced, taken from Saluda creek, six miles 

 south of Hanover [Jefferson county], Indiana.3 



The writer is not certain that this bed in Ohio merits a sepa- 

 ration from the Richmond formation, as is indicated by the dot- 

 ted line on the chart. In fact. Dr. Foerste states that " there is 

 no doubt that in southern Indiana and northern Kentucky the 

 Madison beds are merely the upper unfossiliferous part of the 

 Richmond group,"-* and in proposing the "Saluda bed" he 

 speaks of the hitherto called " Madison beds" as " at the top of 

 the Richmond. "5 



29. The rocks of southwestern Ohio described in the later 

 volumes of the Ohio reports under the name " Hudson River 

 group or series" are here given as the Richmond and Lorraine 

 formations and Utica shale. Clarke and Schuchert did not use 

 " Hudson River " in their revised classification of the New York 

 series and formations in 1899, stating that 



It is becoming increasingly evident that the great mass of shale in the 

 Mohawk and Hudson River valleys which was designated at an early date by 

 this term [Hudson River beds] is resolvable into horizons extending from 

 the middle Trenton to and including the Lorraine beds. At present it seems 

 unlikely that, when this determination of horizons has been carried through 



' Bull. Geol. Soc. Amer., Vol. XII, 1901, p. 436. 



'Atn. Geol., Vol. XXX (December, 1902), p. 368. ^ Ibid., p. 369. 



*BulL Geol. Soc. Amer., Vol. XII (1901), p. 436. 



^Afn. Geol., Vol. XXX (1902), p. 369. 



