52 



ANNOTATED GUIDE. 



LEVIS TO RIVIERE DU LOUP. 



(G. A. Young.) 



Miles and 

 Kilometres. 



o m. Levis (opposite Quebec city) — Alt., 15 It. 



o km. (4-5 m.). Leaving Levis the Intercolonial 



railway for a short distance closely follows the 

 St. Lawrence shore. It then leaves the river 

 and passing out of the circumscribed area of 

 the Levis formation, climbs the sharp rise to the 

 level of a rolling, plain-like area underlain by 

 the red and green slates and sandstones of the 

 Sillery formation which customarily has been 

 assigned to the Upper Cambrian though pro- 

 bably of Ordovician age. 



The Sillery measures outcrop over a zone 

 having a width varying between 6 miles and 

 20 miles (9-7 km. and 32-2 km.) and border 

 the St. Lawrence river from the vicinity of 

 Quebec northeastward to beyond Riviere du 

 Loup, over 100 miles (160 km.) away. 



To the southeast, the Sillery strata are bor- 

 dered by a narrower zone of dark slates and 

 quartzites that conformably underlie the Sillery. 

 The Sillery and the underlying formation are 

 scrongly folded along axes running nearly parallel 

 with the general course of the St. Lawrence. The 

 folds are asymmetrical, the northwestern limbs 

 being steeper than the southern, and in most 

 places the folds are overturned giving a south- 

 easterly dip, generally with angles of 75 or more. 



Within the relatively wide band of the Sillery 

 bordering the St. Lawrence are detached, 

 elongated areas of quartzite and conglomerate 

 composing the Kamouraska formation. These 

 areas vary in length from 10 miles (16 km.) or 

 more down to a fraction of a mile. Their major 

 axes strike approximately parallel with the 

 general strike of the surrounding Sillery. The 

 areas of the Kamouraska are mainly confined 

 to a zone about 45 miles {j2 km.) long, border- 

 ing the St. Lawrence and situated midway 

 between Quebec and Riviere du Loup. 



