32 NEW YORK STATE MUSEUM 



not that they have been noticed in the " gray band " at Rochester, 

 the continuation or equivalent of the " millstone grit." 



In the report for 1840, page 373, the succession of rocks as 

 given by Vanuxem is as follows : 



1 Protean group. 



2 Oneida conglomerate. 



3 Medina sandstone. 



4 Salmon river sandstone. (=Oswego sandstone). 

 K Pulaski shales j / t • \ 



6 Frankfort slate 1 (=Lorrame). 



In the above report, the term Oneida conglomerate is used 

 for the first time and as defined it is the equivalent of the " mill- 

 stone grit " of Professor Eaton. This is also the last of the 

 annual reports in which Vanuxem considers the conglomerate. 

 A detailed account is given in the final report comprising the 

 geology of the third district, to which reference will be made 

 later. 



While Vanuxem was carrying on his investigation in the third 

 district, Hall was carrying on similar work in the fourth district, 

 comprising the western portion of the State. 



In the annual report of the fourth district for 1838, page 294, 

 Hall states, in referring to the Medina sandstone: " The upper 

 stratum of this rock has been called ' grayband,' by Professor 

 Eaton; it, however, appears to be only a gray stratum of the 

 sandstone, generally more silicious and indestructible than the 

 rock below." 



In the same repoft, in describing the Medina in the town of 

 Wolcott, he states [p. 325] : " The upper layers are hard, sili- 

 cious and occasionally pass into a conglomerate or pudding 

 stone." 



With the publication of the final report on the geology of the 

 third district in 1842, Vanuxem concluded his investigations as 

 a member of the State survey. In this volume, under the de- 

 scriptions of the formations and in the geology of the counties 

 in which the Oneida was known, is contained an extensive 

 account of the Oneida conglomerate. The succession in de- 

 scending order as given by Vanuxem in his final report follows: 

 f I Niagara group. 



Ontario ! ^ Clinton group, 

 untario , ^ Qneida conglomerate, 

 division I ^ Medina sandstone. 



l^ 5 Gray sandstone of Oswego. 

 6 Hudson River group. 

 As synonyms for the Oneida conglomerate, Vanuxem gives 

 the following : " Shawangunk conglomerate," " millstone grit 



