Cambrian Rocks in Acadia. 21 
found themselves, must have resulted! What changes in 
these animals and plants themselves must have been gra- 
dually brought about by altered habits and altered food, and 
by the process of selection which new surroundings would 
result in! It is not difficult to conceive how new varieties 
and species would from time to time follow, and how new — 
genera would be created. 
[Nore.—Amid the great mass of material which it has 
been necessary to bring together in preparing this paper, 
it is difficult to single out special collectors without refer- 
ring to all, but I think it right to acknowledge the assist- 
ance in regard to our far western flora which Dr. G. M. 
Dawson and Mr. Macoun’s publications haven given me, 
particularly by indicating in nearly every case the precise 
localities of occurrence.]—A. T. D. 
On A Basa SERIES OF CAMBRIAN Rocks IN AGCADIA. 
By G. F. Marruew, M.A., F.R.S.C. 
[Read before the Natural History Society of New Brunswick, 1st Nov. 
1887. ] 
In tracing back the palseozoic systems to their base in the 
Cambrian, they are found to terminate in various countries 
at different horizons. Thus in Russia there is no fauna that 
establishes a horizon older than that of the Olenus beds *; in 
eastern North America, except along the Atlantic seaboard, 
the fauna with Olenellus seems to be that which exhibits 
the earliest trace of life in the Palsozoic formations; a high 
antiquity has been claimed for the Kophyton sandstones of 
Sweden, but apparently without sufficient warrant, as I 
shall endeavour to show further on; but in Wales, remains 
of animals of several orders have been found in Cambrian 
slates, equivalent to those of the Longmynd in Shropshire, 
which are as old, or older, apparently than the Kophyton 
sandstones. 
* I have just learned from Dr. I’. Schmidt, of St. Petersburg, 
that an older horizon, that of Paradoxides Kjerulfi, has been found 
at the top of the “ Blue Clay.” 
ay 
