80. 



140 THE DEVONIAN AND CARBONIFEROUS. [bull. 



The sandstones below the blue limestone were regarded as equiva- 

 lents of the Old Red sandstone. 



Another table exhibits the folio wing classification of the rocks oi 



Iowa and Wisconsin : 



Coal formation Coal, shale, grit, and slaty claj 



with ironstone, 

 f Cliff limestone. 

 Blue fbssiliferous limestone. 

 Alternations of red and white 



Carboniferous or Mountain limestone formation.. I 



Old Red formation^). 



sandstone and Magnesian lime- 

 stone. 

 Red sandstone.(?) 



John Locke, in a report accompanying Owen's report, stated that he 

 had used the term " Cliff limestone " in the Ohio report (1858), adopting it 

 as a provisional name "from the inhabitants on the Miami above Day- 

 ton, Ohio." He gave a list of synonyms : l 



Galeniferous limestone, Featherstonhaugh. ^ 



Cornutiferous limestone, Eaton. 



Magnesian limestone, Keating and Shepherd. 



Mountain limestone, Ohio Reports. 



Cliff limestone. 



The name " Cliff limestone " is adopted in this paper as a synonymous 

 term for the " Scar limestone" of Phillips's Geology as it appeared in 

 the seventh edition of the Encyclopedia Britannica. 



This report was printed on the 4th of June, 1840, without the accom- 

 panying charts, sections, and illustrations, and transmitted to the 

 House of Eepresentatives. It was revised, and the public edition was 

 ordered by the Senate to be printed June 1, 1844. The executive docu- 

 ment of the House (No. 239) appears to be the first edition unrevised, 

 and there were ordered printed (February 25, 1843) 5,000 extra copies 

 for the use of the House. 



Some important revisions first appearing in the Senate document 



are as follows : 



» 



First, a modification of the classification, expressed in a table giving 

 a comparative view of the correspondence between the New York and 

 English surveys, modified from Hall's table of formations in the Final 

 Eeport on the Fourth District of New York, published in 1843. In the 

 table of the 1844 edition the " Blue limestone" is the equivalent of the 

 Trenton limestone, Utica slate, and Hudson Biver groups of the New 

 York system. The " Cliff limestone " was recognized in part as the 

 equivalent of the Clinton group, Niagara group, the Onondaga, and the 

 Corniferous limestones of the New York system. The " Black slate " of 

 Ohio and Indiana was the equivalent of the Marcellus shale of New 

 York, and the Waverly sandstone and " fine-grained sandstone of the 

 Knobs" were considered as the equivalents of the Portage and Che- 



1 " Mineral Lands of the United States. Message from the President of the United States in reply to 

 a resolution of the House of Eepresentatives, February 6, 1840. House of Eepresentatives, Ex. Doc. 

 No. 239, Twenty-sixth Congress, first session." 



Eeport on a geological exploration of part of Iowa, Wisconsin, and Illinois, made under instruc- 

 tions from the Secretary of the Treasury of the United States, in the autumn of the year 1839, by 

 D. D. Owen, M. D., principal agent to explore the mineral lands of the United Stares, pp. 116, 117. 



