Manlius Formation of A^czv York. — Scliiichcrt. 175 
Salina. Bossardville limestone (12') at top and Poxima Island 
shale (i') below. Both members thicken rapidly southwestward. 
Unconformity here as there is no Clinton nor Niagara. 
Medina red' shale above passing into the Shawangunk grit, 750 
feet. 
Hudson River slates upturned and eroded. 
POSITION OF THE CORALLINE LIMESTONE. 
The actual position of the CoralHne or Cobleskill Hniestone 
is located in the Schoharie section (see p. 173). Here it is a 
zone seven feet thick, resting on nnfossiliferous pyritiferous 
shales, the exact age of which cannot be determined at Scho- 
harie, but is as stated usually regarded as the eastern attenuat- 
ed edge of the Clinton. The Niagaran is not present here, and 
Hall states that it has thinned out to a thin concretionary band 
in Herkimer county and is absent east of this region.* Yet 
Hall believed the Cobleskill to be the eastern representative of 
the Niagara. Above the Cobleskill in the Schoharie section, 
follows a Waterlime (not the Waterlime or Bertie formation 
of Litchfield but the Rondout member), which dift'ers in color 
from it, but this expression of a change in the physical con- 
ditions did not affect the fauna, since the most abundant coral 
Favosites hcldcrbergiac praccedens continues into the Water- 
lime for three feet. Not only this, but three characteristic 
species of the Cobleskill, Stropheodonta bipartita, RhyiicJw)iclla 
(F) lamcUata, and Spirifer eriensis, ■ cowimwQ still higher in the 
same section. These facts show that the Cobleskill limestone 
is -intiinately connected with the "waterlime" or Rondout of 
the Schoharie section and also that the latter is but an early 
phase of the Tentaculite limestone, because it has two of its 
characterizing fossils, as Spirifer vanuxenii and Leperditia alt a. 
The Waterlime about Litchfield, to which the name Bertie 
formation is now applied underlies the Cobleskill, and has a 
fauna the equivalent of that of the cement beds in the quarries 
at Buffalo, New York. Not a single species of the euryptci-oid 
fauna of the Bertie limestone has been discovered in the Water- 
lime above the Cobleskill. 
Passing to the east of Schoharie and observing the sections 
of Albany county, one sees that the nnfossiliferous pyritiferous 
shales are absent, and further, that in the Indian Ladder sec- 
* Nat. Hist N. Y., Pal., ii, 1852, pp. lOG-107. 
