THE HAMILTON. ASSOCIATION, 81 
posure in order to weather out. The lumps of half decayed chert 
are there, but the outer edge of the sponge within does not yet make 
an appearance, and the sections are rarely perceptable. 
The upper glaciated chert beds hold great numbers of fossils, 
which doubtlessly come under the head ‘“‘ Cladopora” (Hall). Prof. 
Foorde (British Museum) expresses his opinion that it belongs to 
the Monticuliporide. If difference in form is deemed sufficient to 
constitute new species, there are here several as yet undescribed. 
‘he fibrous structure of Monticuliporidz or Chetzetes is very 
clearly displayed, but one in my possession presents an undoubted 
straited Epitheca, which leads me to suppose its true classification 
may be with the Polyzoa. The Fenestellidz are also well represent- 
ed in these upper chert beds. The majority I have seen figured are 
mere fragments Now, here the radix or base presents itself, and 
they widely differ in many instances ; some like certain forms of the 
Graptolites are cup-shaped, others display a fan-like appearance, the 
stem proceeding from spreading rootlets. ‘They are also often beau- 
tifully preserved. 
It is much to be regretted that the swampy places near the 
Corporation drain, where Bryozoans are chiefly found, were unknown 
to Drs. Nicholson and: Hinde when they visited Hamilton. It is 
about the last spot in which the geologist would ever dream of hunt- 
ing for organic remains. The Professors made the Fenestellidz a 
_ special study, and discovered several forms previously unknown in 
the Devonian rocks of Ontario. On this account, I regret no oppor- 
tunity was afforded me to point out to them where Niagara Polyzoa 
were obtainable, and in far better preservation than any known to 
me extracted from the true limestones of the Niagaras used for 
building purposes. 
But the Niagara sponges (mainly confined to these glaciated 
_ layers which disappeared on the brow of the Hamilton escarpment 
in The Great Ice Age), the Cladoporee, the Bryozoans (so charac- 
teristic) by no means represent the entire organic remains of that 
portion of the layers deposited. Graptolites, differing from any 
figured or described by Dr. Spencer, -have been noted in the 
deeply grooved and polished upper beds of the city quarries, and 
others adjacent. The Corporation drain swamp recently afforded 
me seyeral interesting specimens of rare flint-flake fossils, viz. : 
