Manlius Formation of Nczu York. — Schuchert. 177 
sequence is completed, that some of the formations increase 
in thickness, and that all lie conformably beneath the Helder- 
bergian.* 
In southeastern New York the Manlius is about the thick- 
ness of that in Herkimer county, but here the Cobleskill ap- 
pears to occur about thirty feet higher than to the north. At 
Grovania and Selinsgrove Junction, Pennsylvania, the Coble- 
skill fauna occurs at about the same horizon as in southeastern 
New York. Farther south in Pennsylvania and Maryland it 
is more diffuse and ranges through a horizon of about fiftv 
feet, if one is to judge by the position of the corals in the local 
sections of the Manlius. Rhynchonella (?) lainellata is not 
reliable as an indicator of the Cobleskill fauna, since in Mary- 
land it is known to range through 450 feet of strata of the Up- 
per Salina and Manlius formations. 
THE MANLIUS FORMATION REDEFINED. 
In the preceding pages it has been 'shown that the Coble- 
skill limestone is not the eastern representative of the Niagaran 
of the western part of New York, but that it is inseparably 
connected with the Rondout member of the Manlius, and that 
this zone follows without break into the Tentaculite limestone. 
The latter is usually regarded as the entire Manlius form- 
ation, but it will be more expressive of conditions in nature to 
extend it to embrace all the strata between the Bertie and 
Coeymans limestones. This will also be more in harmony with 
Vanuxem's conclusion, since he included the horizon having the 
Cobleskill fauna in his Manlius formation (see pages 169, 170). 
From his definition of this formation, usage long ago excluded 
the lower Waterlime, and this part is here referred to as the 
Bertie limestone. Therefore, the Manlius formation, as above 
defined, includes in the typical area, Herkimer and Schoharie 
counties, N. Y., the Coralline or Cobleskill limestone, the Up- 
per "Waterlime" or Rondout and the Tentaculite limestone or 
Upper Manlius. 
At present, the recorded fauna of the Manlius is a small 
one. In the near future, however, the writer hopes to describe 
a large accession made in Pennsylvania, Maryland, and West 
* For proof of this in Maryland see Schuchert "On the Lower Devonic and 
Ontaric formations of Maryland, {Proc. U. S. Xat. Mus., xxvi, 1903, pp. 
413-424). 
