QUEBEC GROUP OF ROCKS, ETC. 41 
fossil evidence, the existence of the upper part of this primordial zone in strata pre- 
viously referred to a higher place in the series; and this view was much confirmed, 
as well as forced upon the attention of others, by the subsequent announcement of 
Oleni in strata which seemed to be of the same horizon in Vermont. Descriptions by 
Prof. Hall, of these Trilobites (then referred to the upper part of the Hudson River 
group), will be found in Volume IV. of the Canadian Journal, page 491. When 
the knowledge of these forms reached Barrande, he boldly declared his conviction, 
that too high a position had been accorded to the rocks from which they were 
procured. If this assumed position could be maintained, the limits of his primor- 
dial zone became altogether broken up. Under these circumstances, the accom- 
panying remarks addressed quite recently, by Sir William Logan to Mr. Barrande, 
and just issued as an independent publication, will be found of ro ordinary scien- 
tific interest. In Bohemia, the genus Paradowides, and in Sweden and England, 
Paradoxides and Olenus, constitute the more typical trilobitic forms of the primor- 
dial zone. These types, as yet, have not been recognised in Canada,—although 
Paradogides has been met with in Newfoundland and Massachusetts, (Canadian 
Journal, Vol. I1, New Series, p. 49,) and Olenus in Vermont. We may yet 
expect to find them, however, in the dark shales which underlie the Quebec group; 
and in this latter, Mr. Billings has already detected the genus Conocephalites, a 
marked type of the Bohemian zone, together with other related forms.—E, J. C.] 
MontrEAL, 31st Dec., 1860. 
My pear Mr. BarranpeE, 
I am much indebted to you for your letter of the 6th August, 
which was accompanied by acopy of your communication to Professor 
Bronn of Heidelberg, dated 16th July. Agreeably to your request, I 
took an early opportunity of letting Mr. Hall have a copy of your com- 
munication to Professor Bronn, and he received it on the 11th or 12th 
September. 
I am of course aware, from tne correspondence you have had with 
my friend Mr. Billings and myself, how far you are acquainted with 
our discoveries at Quebec. On two occasions, just previous to the 
receipt of your last letter to Mr. Billings (received the 8th November), 
I devoted the short time I could spare from other engagements con- 
nected with the Geological Survey, to farther researches at Point Levi. 
I have satisfied myself, notwithstanding the conglomerate aspect of the 
bands of rock which contain our new fossils, that the fossils are of the 
age of the strata. Without entering at present on minute details of 
structure, I may say that the chief part of the specimens found up to 
this time, are from two parallel out-crops, which might be taken as 
representing two distinct layers. If they are such, they are compre- 
hended in a thickness of about 150 feet; but the circumstances of 
the case, connected with the physical structure, make it probable that 
