I04 Bulletin 12 23^ 



Black Lingula shales. 

 Grey Coralline Falls limestones. 

 Chain coral and Upper Magnesian Cliff limestone. 

 Blue, Shell, and Birdseye limestones of Fayette and Frank- 

 lin counties. 



In a report published in 1S40* Owen made the following five 

 divisions of the rocks in the states of Indiana, Ohio, Kentucky, 

 and Tennessee:! 



Pentremetal limestone, light-colored limestone, sometimes 



Oolitic. 

 Fine-grained sandstone in knobs. 

 Black bituminous shale. 



Thick beds of yellow limestone, Cliff limestone of the west. 

 Blue fossiliferous shell limestone in thin beds with Marlite. 



It will be noted that in the above classification the Devonian 

 limestones are not separated from the Niagara, but included with 

 the latter under the name of Cliff limestone of the West. 



In the revised edition of Owen's Report published in 1844 the 

 "Black slate" of Ohio and Indiana is considered the equivalent 

 of the Marcellus shale of New York.| 



In 1 84 1 Dr. A. Clapp, in a communication to the Philadelphia 

 Academy of Science, || correlated the limestone at the Falls of the 

 Ohio with the Wenlock of Murchison by means of the fossils. 

 The Black shale he considered to be the probable equivalent of 

 the Marcellus shale of New York. 



In a later communication§ the "Wa,ter lime of the Falls of the 

 Ohio," which is described as a drab-colored rock lying below the 



^Mineral Lands of the United States. Message from the president of 

 the Jr. S. in reply to a resolution of the House of Representatives, Feb. 6, 

 1840. House of Representatives, Executive Document No. 239, Twenty- 

 sixth Congress, first session. 



flbid., diagram 4, p. 1S2. 



j Williams, Bull. U. S. G. S., 80, p. 140. 



l|Proc. Phila. Acad. Sci., vol. i, 1841, pp. 18, 19. 



^ " " " " " " " p. 178. 



