102 GEOLOGICAL AREAS OF CANADA. 



Lambert, St. Yallier, Yallery, Cacouna, and other sites ; the ochres 

 of Durham ; the shell-marls of Stansteacl, J^ew Carlisle, &c. ; and the 

 peat beds of the Liiviere Quelle, Riviere du Loup, Metis, Rimouski, 

 and Madawaska. 



(4.) The Anticosti District. — This division includes the large Island 

 of Anticosti, in the St. Lawrence Gulf; the group of the Mingan 

 Islands on the opposite northern shore ; and a narrow strip of the 

 latter lying around the mouth of the Mingan River, and extendiag 

 eastward for several miles. It should also include, strictly, the strip 

 of land along the Gaspe Coast, lying north of the line of dislocation 

 described under the preceding division. It is essentially a region of 

 unaltered and comparatively undisturbed Silurian strata. The 

 Island of Anticosti extends in a general north-west and south-east 

 direction, with a length of about 1-50 miles, and a breadth, in its 

 broadest part, of about 35 miles, gradually tapering at the extremi- 

 ties. The northern coast presents bold ranges of clifFs, from 200 to 

 400 feet in height, cut through in places by deep water-courses. The 

 interior of the island is thickly wooded, but is destitute of lakes and 

 important streams. It appears to consist of a series of plateaux or 

 broad terraces, gradually descending to the south shore. The latter, 

 although showing in places high cliffs of drift clay, is mostly of a 

 low and swampy character, and this part of the island is especially 

 characterized by the presence of extensive beds of peat. 



The Mingan Coast consists of arenaceous limestones and dolomites 

 of the Calciferous formation, and similar strata on the islands are 

 succeeded by Chazy beds composed of reddish and pale-grey liro,e- 

 stones, with interstratified arenaceous shales. On the principal 

 island (Large Island) of the Mingan group, light-coloured limestones, 

 holding characteristic Lower Trenton or Black- River fossils, overlie 

 the Chazy beds — the whole dipping, at a slight angle, southwards or 

 towards the Gulf. The next exposure (in the regular sequence of 

 Lower Silurian formations) occurs along the opposite north coast 

 of Anticosti, and consists of greyish and other coloured limestones, 

 with interstratified shales and conglomerates, having an inland or 

 southerly dip of very slight amount. These beds belong to the upper 

 part of the Hudson R,iver formation, and it may thus be legitima'ely 

 inferred that the intervening area of the Gulf is occupied uninter- 

 ruptedly by other Hudson River beds,,with Utica and Trenton strata 

 cropping out successively from beneath them. In some of these 



