Marcou.] 
222 
[Jan. 2i- 
the Paleontologist of tlie Geological Survey of the State of New 
York and the Geologist of the State of Pennyslvania, he added, in, 
1845, a foot-note, in which he retracted his first opinion of 1842, 
saying that the rocks of Pointe-Levis are above the St. Lawrence 
limestone (Trenton limestone). 
1853. — Bigsby (J. J.). — On the geology of Quebec andits environs {Quart. 
Jrn. G-eol. Soc. London , vol . ix, p. 82). With a “ Geological map 
of the vicinity of Quebec,” on which all the strata of Quebec and 
Pointe-L6vis are placed above the Trenton limestone, as belonging 
to the Hudson river group. 
1854 — Logan (W. E.) — Geol. Surv. Canada. Report of Progress for the 
year 1852-53. Quebec. Geology of the north side of the St. Law- 
rence, between Montreal and Cape Tourmente below Quebec ; pp. 
34-36. 
1855. — Logan (W. E.) et Sterry-Hunt (T.). — Esquisse g6ologique du Can- 
ada, Paris, pp. 49-52. With a general: “ Carte g^ologique du 
Canada,” par W. E. Logan. The hills around Quebec and Pointe- 
Levis are referred to the Hudson river group and the Oneida con- 
glomerate. On the map, Pointe-Levis and a part of Quebec hills are 
colored as Onondaga gypseous limestone. 
1858. — Hall (James). — Descriptions of Canadian graptolites, in Report 
Geol. Surv. Canada , for the year 1857, Toronto, pp. 109-145. The 
author refers the strata of Pointe-Levis to the Hudson river group, 
adding that they form also the rocks of Quebec-city. Two of the 
species were published first in 1855 in Canadian Naturalist , vol. 
hi, under the title: “Note upon the genus Graptolithus, and de- 
scriptions of some remarkable new forms from the shales of the 
Hudson river group, etc. , etc.” Mr. Hall reprinted the same paper 
in the Twelfth Ann. Rep. State Cabinet Nat. Hist., State of New York , 
pp. 47-58, Albany, 1859. 
1860. — Billings (E.). — On some new species of fossils from the limestone 
near Pointe-Levis, opposite Quebec. ( Canadian Naturalist , vol. v, 
p. 301, August). 
1860 — Barrande (J.) and Marcou (J.) — On the primordial fauna and 
the Taconic system ( Proceed . Boston Soc. Nat. Hist., vol. vn, pp. 
369-382, October). Barrande refers the fossiliferous limestone of 
Pointe-L6vis to the Taconic system ; and Marcou calls the rocks 
of Montmorency fall quartzites instead of gneiss, and says that he 
did not see the fifty feet of Trenton limestone pointed out by Logan 
as existing at the foot of the fall, nor the anticlinal axis with fault 
of Logan. It is the first hint of the grave errors committed in re- 
ferring the strata of Pointe-L6vis, Quebec-city, and the foot of 
Montmorency falls, to the Hudson river group, the Oneida con- 
glomerate and the Onondaga gypseous limestone. This paper has 
been called “turning point” of the Taconic question. Part of the 
paper has been reprinted, under the altered and false title of : “ On 
the primordial fauna and the Taconic system of Emmons, in a 
