1888 .] 
55 
[Marcou. 
slates of Lorraine or Richelieu on which lay, in concordance of strat- 
ification, a series of strata forming the upper part of the Hudson 
river group, and which forms all the heights ( hauteurs ) of the city 
of Quebec and Pointe Levis. Then above that series called “for- 
mation de Quebec,” we have another series of red and green slates 
with sandstone, called by Logan “ groupe de Sillery” which he re- 
gards as the equivalent and the homataxis of the Oneida conglom- 
erate of New York. 
Mr. Hunt says that he found at Ouelle river, in the “ Sillery 
formation”, what he calls “ fragments d’os !”, while in the slates of 
Pointe Levis he found “ coprolites !” 
Here is the classification of 1855, as recorded on the map : 
FORMATIONS. 
SYSTEMS. 
Calcaire de Niagara 
Gr6s d’Qneida, or Sillery formation. 
Groupe de la Riviere Hudson, or Quebec formation. 
Schistes de Utica. 
s Trenton. ..... 
Calcaire de 1 Black river 
C Birdseye 
Calcaire de Chazy. . . % . 
Gr§s Calcifere. 
Gres de Potsdam. 
Huronian 
Silurien superieur. 
Silurien inf^rieur. 
Cambrien. 
LOGAN’S CLASSIFICATION OF 1861 TO 1865 . 
The “ Geology of Canada,” a bulky volume in 8vo, appeared at 
intervals from 1861 to 1863 and 1865. In 1861, I received the 
first 400 pages ; then, in 1862, 400 more pages, bringing the volume 
to chapter xxii, called “Supplementary”, and, finally, in August, 
1863, the whole volume was distributed, with a notice that the at- 
las containing geological maps and sections would not be ready 
before the end of 1863. That atlas, however, was not issued until 
1865 or 1866. 
During the printing of the volume and the engraving and col- 
oring of the reduced “ Geological Map of British North America,” 
the classification was changed on account of the publication in 
December, 1860, in the ‘Proceedings of the Boston Soc. of Nat. 
Hist.,’ Yol. vn, p. 369, of the joint paper of Barrande and Marcou, 
“ On the Primordial Fauna and the Taconic System.” 
