THE HAMILTON ASSOCIATION, 105 
his researches in a more systematic manner and much more carefully 
than is generally done by scientific men. Owing to a well under- 
stood rule among geologists that o organic remains unfigured and 
undescribed are recognized, Mr. Pettit lost the credit as the original 
collector of many fossils subsequently claimed and acquired by 
others. 
Rhynchonella obtained at Grimsby (here submitted for inspec- > 
tion) is probably not represented in the Niagaras near Hamilton. 
It is usually found in a somewhat crushed condition and this is the 
only fairly preserved one I succeeded in extracting. On one slab 
it occurs associated with orthis hybrida. Evidently someone 
must have previously noticed it, for in some places the thin limestone 
layers around had been collected and placed face downwards to 
conceal the Corals, Bryozoras and shells on the surface. ’Tis an old 
trick on the part of collectors to hide from curious eyes specimens 
which cannot be conveniently removed, but hard, thin beds oc- 
curring in shales are usually fossiliferous and never should be passed 
by without close examination. 
Few field geologists would imagine that the upper Red Clinton 
Iron band in rear of the Reservoir, near Judge Robertson’s, is 
represented at Grimsby by red and mottled sandstones, rather soft 
and loose as regards texture. Some of the recently erected houses 
there are built of the material—I would not suppose it a durable 
building stone. The colored Lingula bed, of Hamilton, puts in 
an appearance in the shape of a liver-colored freestone, the Brachio- 
pods were numerous, but in indifferent preservation. The green layers 
or greyish sandstone below the Niagara limestones there present some 
fine specimens of the singular fucoid Arthrophycus Harlani. I wish 
some of my friends, who doubt that it represents a plant at all, had 
had an opportunity of examining some of the large massive blocks, 
unfortunately too heavy for removal, from the ravine at Grimsby. The 
tufts or branches proceeding from the main stem are sufficient to 
show that Credner is not mistaken regarding the nature of the im- 
pression. Other plant remains, not displaying the peculiar marking 
of Arthrophycus, may prove to be identical with an undescribed one 
from the same horizon here. I regret I failed to obtain a portable 
sample. We have not ascertained, as yet, the limits of our local 
Chert beds. That they extend as far as Grimsby is rather ques- 
tionable. I never succeeded in tracing to their original place the 
