378 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Corniferous Limestone gives us forty original forms ; and receives 

 only four Brachiopoda (Leptcena depressa, L. crenistria, Orthis tul- 

 liensis, and Spirifer cultrijugatus) and one Trilobite (Phacops 

 macrophthalmus) . It transmits seven Brachiopoda and four other 

 molluscs. 



Thirty-four fossils remain typical, chiefly Brachiopoda and Gaste- 

 ropoda. Among these are Odontocephalus selenurus of Green (at 

 Auburn), and Calymene crassimarginata — occurring in the higher 

 parts of the group, where there is no hornstone. There the fossils 

 most prevail. 



The organic remains of the Onondaga and Corniferous limestones 

 do not intermingle, but remain quite distinct, as far as is at present 

 known, although those two sets of strata are so closely connected and 

 so similar in composition. For further details the reader is referred 

 to Tables VII. and VIII. 



Fossils occurrent in Europe. — There is a Cyrtoceras like those of 

 Devonshire (De Verneuil), besides thirteen other invertebrates com- 

 mon to New York and Europe. They are — 



Halysites catenulatus De V. M'Coy Russia, Ireland, &c. 



Chonetes nana De V. Russia (Devonian). 



Leptaena depressa Sharpe Sweden, England. 



Orthis crenistria De V. Europe. 



Productus subaculeatus De V. Russ., France (Dev.). 



Spirifer cultrijugatus De V. Eifel (Dev.). 



heteroclytus De V. Russ., Eng. (Dev.). 



mucronatus De V. England (Dev.). 



Terebratula aspera De V. France (Dev.). 



concentrica De V. Russia, Rhine. 



Atrypa reticularis De V., Sharpe Europe. 



Bellerophon striatus De V. Europe (Dev.). 



Lucina proavia De V. Europe. 



Fossils recurrent in New York. — The sympathies of Corniferous 

 limestone are principally with the Hamilton and Chemung groups. 

 The recurrency of Devonian fossils, as affecting this rock, is repre- 

 sented in Tables IX. and X. (the several mineral groups with which 

 it has no palseontological connection are omitted). The relations of 

 this stratum as to fossils, it will be seen by Table X., are all with the 

 upper sections, save in one instance. 



Marcellus Shale*. 

 (The Black Shale of Kentucky, Ohio, and Indiana.) 



Mineral Character. — This shale ought to be divided into two 

 parts (Vanuxem, Hall). The lower part is a very black bituminous 



* Professor Rogers thus describes the Marcellus Shale of New York, as it is 

 continued into Pennsylvania and further south. It is there, according to him, a 

 black and highly bituminous slate, graduating upwards into a dark-blue argilla- 

 ceous shale, surmounted occasionally by greenish sandy shales. A thin argilla- 

 ceous limestone generally occurs at the bottom of the black slate in Pennsylvania, 

 Virginia, and Tennessee. 



The fossils of this shale comprise numerous species of mollusca and other 

 marine forms, several of which are identical with the Devonian, and Carboniferous 

 species of Europe, many being found in no other rock. Goniatites and other 

 Carboniferous genera characterize Marcellus Shale (Johnston's Atlas, loc. cit.). 



