63 
[Marcou. 
mit.” Logan makes it pass “just north of the fortress ; then it 
coasts the north side of the island of Orleans” (“Remarks on the 
Fauna of the Quebec Group, etc., addressed to Mr. Joachim Bar- 
rande,” Montreal, Jan. 3, 1861, pp. 3 and 4). 
Mr. Selwyn disagrees with Logan, first, as to the character of 
the break, calling it synclinal , where Logan finds an anticlinal , and 
he is not certain whether it is a dislocation or an unconformity. 
As to the so-called fault or overlap passin gjust north of the fortress, 
Mr. Selwyn holds that it is a mistake of Logan, and that instead of 
passing in the rear of the Quebec citadel, it passes in front , but un- 
der the river. 
I have explored all the cliffs from Mountain street and the Saut 
du Matelot (City of Quebec) to the Diamond harbor or Cove fields 
and farther west as well as the rear of the citadel at the old French 
works and actual rampart, and nowhere did I find any trace of 
fault or qverlap. The strata present that fan-like structure, so 
common in the Alps, with the greatest development of the fan on 
the north side of the city itself ; and at the same time on the south 
side of the citadel, the cliff shows a fold of arched form with a long 
rise, recalling the splendid arch of the citadel of Besangon in 
France, but less accentuated as regards the arch and the steepness 
of the rocks. 
Now, Mr. Selwyn places that so-called fault or unconformity — * 
he is not sure which — in the bed of the St. Lawrence river, and 
regards it as passing underwater on the south front of the citadel, 
instead of the rear. Of course it is impossible to know the true 
condition, and it is simply a supposition without any basis to rest 
upon. Then Mr. Selwyn makes it reappear on the north shore of 
the St. Lawrence, one mile north of Pointe a Puizeau, without giv- 
ing the exact locality of the cliff, leaving in doubt whether he saw 
it somewhere at the cliff of Sillery cove, or elsewhere on the pla- 
teau at Benmor, Kirkela or at Cataraqui. As I have explored the 
whole cliff from Quebec city to Cape Rouge, I can say that I have 
not seen a single fault or overlap anywhere. 
From one mile north of Pointe-a-Puizeau, Mr. Selwyn carries 
his so-called fault across the whole plateau to the north of St. Foy 
and then due west to Cape Rouge, where he runs it again into the 
River St. Lawrence and keeps it under water. All that bayonet- 
shaped fault over the Sillery plateau is pure imagination and can 
be classified with the bayonet- shaped fault of Logan just north of 
the citadel. 
