walcott.J SUMMAKY NORTHERN APPALACHIAN. 285 



CANADIAN EXTENSION. 



The Canadian extension of the northern Appalachian district is from 

 the United States boundary northeast to the viciuity of Point Levis, 

 Quebec, on the western side of the extension of the Green Mountains, 

 or Sutton Mountain anticlinal, and from Quebec down the south shore 

 of the St. Lawrence River to Cape Rosier, Gaspe. On the eastern side 

 of the anticlinal the supposed Cambriau rocks of New Hampshire, cross- 

 ing the southeastern portion of the Province of Quebec to the Maine 

 boundary, are also included. 



The stratigraphic succession of the rocks referred to the Cambrian in 

 the eastern Province of Quebec and down the St. Lawrence River to 

 Cape Rosier is not yet clearly determined, owing to the faulting, plica- 

 tion, and absence of clearly defined Cambrian faunas in situ in the 

 strata. In the viciuity of Quebec, on the authority of Dr. R. W. Ells, 

 the stratigraphic succession is as follows : l 



(1) Black, green, and gray shales, with hard aud heavy bands of grayish, some- 

 times yellowish white, quartzoso sandstone, which are thickest in the lower portion, 

 and with occasional thin bands of limestone conglomerate, the pebbles being gener- 

 ally small and the paste highly qnartzose. The quartzites have occasional scattered 

 pebbles of grayish limestone. 



(2) Greenish, grayish, and blackish, with occasionally dark-reddish or purplish- 

 tinted shales, with bands of hard grayish sandstone, generally fine-grained, and in 

 thickness from 1 inch to 1 foot, the massive quartzites being absent and many of 

 the greenish layers being covered with fucoidal markings, well seen on the shore 

 above Cape Rouge and in the cutting along the road above that village. 



(3) Bright red shales, often with thiu greenish or grayish bands, which in places 

 are calcareous. Tho rocks on a smoothed surface have a striped red and green aspeot; 

 in the upper part occasional beds of a foot or more of hard green-gray sandstone 

 occur. 



(4) Red, greenish gray aud black shales, with interstratified masses, often lentic- 

 ular, of greenish and grayish Sillery sandstone, ranging in thickness from 2 feet 

 upward, in which the Sillery quarries are locatod. This is the typical Sillery sand- 

 stone, which ranges from a fine-grained homogeueous rock to a fine quartz conglom- 

 erate, much of the rock being characterized by tho preseuce of small flaky pieces of 

 shale and scattered small pebbles or large grains of clear quartz, the bands of saud- 

 stone being separated by partiugs of various colored shale. The local and lenticular 

 character of the sandstone is well seen in the Sillery section, some of the heaviest 

 beds inland thinning out before reaching the shore in either direction. In the upper 

 part, at Sillery church, Obolella pretiosa occurs, from which point an anticlinal 

 crosses the river to Point Levis, and appears in the cliffs at the Victoria hotel, where 

 the same Obolella is found. 



Above the Upper Sillery Dr. Ells places the Levis shales and con- 

 glomerates of Levis City, the shore exteusion below South Quebec and 

 St. Joseph aud the west end of Orleans Island. In the Levis shales, 

 the conglomerate limestone, embedded in a calcareous matrix, carries 

 numerous bowlders in which the Upper Cambrian fauna is found ; and 

 in what is supposed to be the equivalent of No. 2, a conglomerate lirne- 



1 Second report on the geology of a portion of the Province of Quebec Gool. Surv. Canada, new 

 ser., yoL 3, part 2, 1889, pp. 63 K, 64 K. 



