1172 NEW YORK STATE MUSEUM 



will thus be seen how the Manlius or Tentaculite limestone with 

 its distinctive fauna came to be included with the waterlime 

 group. 



In the final report of the third district Vanuxem 1 does not use 

 the term Waterlime group of Manlius but simply Waterlime 

 group. The fauna cited by Vanuxem is that of the Tentaculite 

 limestone of Gebhard and Mather. In 1899 when it became de- 

 sirable to substitute for Tentaculite limestone a locality name, 

 Manlius was the term chosen, and as defined by Clarke & 

 Schuchert 2 it is the equivalent of the " Tentaculite limestone of 

 Grebhard, Mather and later writers." Since it has been shown 

 that at the type locality of the Manlius the Cobleskill was 

 included with the Salina it is in the latter sense that I have 

 used the term Manlius throughout and always as a unit, though 

 I have realized that the original waterlime group in the eastern 

 portion of the district provisionally included the Cobleskill. 

 Vanuxem 3 there referred what is now recognized as the Cobles- 

 kill to the waterlime group or to an intermediate one which he 

 did not attempt to define. The Manlius waterlime was never 

 strictly defined and Hall 4 regarded it as a superior mass and 

 above the strata containing the typical fauna. Consequently 

 in the eastern portion of the fourth district the Onondaga salt 

 group included all the strata up to the Manlius limestone. The 

 Salina group as thus construed by Hall in this portion of the 

 State may have had much to do with his calling the waterlime 

 above the Cobleskill in Schoharie county Salina, since it occupies 

 the same position stratigraphically with reference to the 

 Manlius limestone. 



Among the chief reasons advanced by Mr Schuchert for in- 

 cluding the Cobleskill with the Manlius formation is the state- 

 ment that the fauna of the Cobleskill does not contain a single 

 Magaran species, while it does contain a few species in common 

 with the Manlius. I agree fully with Mr Schuchert that the 

 Cobleskill and the Manlius contain species in common and I have 



1 Gaol. N. Y. 3d Dist. 1842. p. 110. 



2 Science, Dec. 15, 1899. 



3 Geol. N. Y. 3d Dist. 1842. p. 99. 



4 Geol. N. Y. 4th Dist. 1843. p. 128, 129, 141. 



