414 CHARLES S. PROSSER 



black slate mentioned by Dr. Clapp is now known as the New Albany 

 black shale, which in a general sense may be regarded as the western 

 continuation of the Ohio shale. It was, furthermore, reported that 

 Dr. Clapp made the following correlations between divisions of the 

 Cliff limestone and certain New York formations: 



The lower and middle portions of the Cliff limestone he conjectures to be 

 equivalents of the Niagara limestone and Gypseous shales; the entire mass called 

 the Cliff limestone represents therefore the Niagara limestone, Gypseous shales, 

 water-lime, Onondaga limestone, etc., to the Marcellus shales. 



It is stated by Dr. Newberry that the Corniferous limestone was 

 first identified in Ohio by Professor Hall in 1841 ; T but in his paper 

 entitled "Notes upon the Geology of the Western States," Professor 

 Hall's statement is simply this: "In examining the upper part of the 

 'cliff limestone' I found it, so far as lithological characters are con- 

 cerned, a continuation of the Helderberg group;" and the Niagara 

 limestone is mentioned as occurring in "the vicinity of Columbus." 2 

 In another article, however, published the following year, Professor 

 Hall reported the occurrence of the Corniferous limestone in the 

 vicinity of Columbus, stating that 



a short distance to the west of that place [Columbus] the Corniferous limestone 

 of New York appears, presenting its characteristic fossils. This mass is the upper 

 part of the cliff limestone formation of Dr. Locke, the name by which it is generally 

 known in Ohio. 3 



In 1847 de Verneuil stated that the Devonian system in New York 



is principally composed of schists and argillaceous sandstones, which, as we have 

 said, are lost and disappear in the West; it thence results that in the states of Ohio, 

 Indiana, and Kentucky it is reduced to the black schists, which represent the 

 Genesee slate, and to a calcareous band which represents at once the Corniferous 

 and Onondaga limestones and the Hamilton group of the state of New York. 4 



Under Dr. Newberry's direction, the Devonian limestones, which 

 he called the Corniferous, were carefuly studied during the progress 



1 Report of the Geological Survey of Ohio, Vol. I, Part I (1873), p. 142. 



2 American Journal of Science and Arts, Vol. XLII (1842), p. 58. 



3 Transactions of the Association of American Geologists and Naturalists (1843), 

 P- 273- 



4 Hall's translation in American Journal of Science and Arts, second series, 

 Vol. V (1848), pp. 369, 370. The original is in the Bulletin de la Societe geologique de 

 France, second series, Vol. IV (1847), p. 680. 



