223 
letter to Professor Broun of Heidelberg,” in the Amer. Jr. Sc., vol 
xxxi, March 1861, pp. 212-215, in the Canadian Naturalist , vol. 
vi, pp. 108-173 and also in the “ Geology of Vermont,” vol. i, pp. 
377-379, March 1862. 
1861. — Logan (W. E.). — Remarks on the fauna of the Quebec group of 
rocks, and the primordial zone of Canada, addressed to Mr. Joa- 
chim Barrande, 15 January 1861. The author admits that the 
Hudson river group and Oneida conglomerate for the rocks of 
Pointe-Levis and Quebec-city is an error, and he refers them now 
to the horizon of the Chazy and Calciferous. His explanation of 
the strata at Pointe-Levis is so confused as to be incomprehensible. 
Reprinted in the Canadian Naturalist, vol. v, pp. 472-477, also in 
the Amer. Jr. Soc., vol. xxxi. pp. 216-220; and in the “Geology of 
Vermont,” vol. i, pp. 379-382. 
1861 — Hall (James). — On the primordial fauna and Pointe-Levis fossils in 
a letter to the editors of the American Journal of Science and Arts , 
vol. xxxi, March 1861, pp. 220-226. The author opposes Bar- 
rande’s conclusions in regard to “successive trilobitic fauna”; and 
maintains that on “paleontological evidence” and on “stratigraplii- 
cal basis” the rocks of Pointe-LSvis belong to the Hudson river 
group. Reprinted in the Canadian Naturalist vol. vi, p. 113-120, 
and also in the “ Geology of Vermont,” vol. i, pp. 382-386. 
1861. — Logan (W. E.). — Considerations relating to the Quebec group and 
the upper copper-bearing rocks of Lake Superior ( Canadian Natu- 
ralist vol. vi, pp. 199-207, May 1861) ; with a vertical section 
extending from Montmorency to the Island of Orleans, p. 199 ; and 
a diagram at p. 206, showing the author’s opinion on the deposit 
of the Potsdam, Quebec group, Birdseye, Black River, Trenton, 
Utica and Hudson river in the Montmorency region. 
1861. — Barrande (Joachim). — Documents anciens et nouveaux sur la 
faune primordiale et le systeme Taconique en Amerique ( Bulletin 
Soc. geol. France, vol. xviii, pp. 203-321, Eevrier 1861, received in 
America August 1861. At pp. 209-216, chap. n. — “Faune nouvelle, 
decouverte a la Pointe-L6vis pres Quebec, et renfermant des trilo- 
bites de forme primordiales ;” and at pp. 315-221, “Observations au 
sujet de la communication de Sir W. E. Logan, sur la faune du 
groupe de Quebec.” A very remarkable and impartial paper. 
1861. — Billings (E.). — On some of the rocks and fossils occurring near 
Philipsburgh, Canada East ( Canadian Naturalist, vol. vi, pp. 310- 
328.) Comparison of the upper limestone of Pliillipsburgh with 
the Pointe-Levis limestone, referred to the upper part of the 
Calciferous. 
1861. — Marcou (Jules) . — Sur les roches fossiliferes les plus anciennes de 
1’ Amerique du nord; deuxieme lettre de M. J. Marcou a M. Elie 
de Beaumont ( Comptes rendus de V Academic des sciences, tome 
liii, 4 November, 1861, pp. 915-921, Paris). First description of 
the Redoubt at Pointe-Levis, with its primordial fauna as belong- 
ing to the Taconic system. 
