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102 (7. D. Walcott— Review of Dr. R. W. Ells' > Report 



gog, and on the western slopes of the Sutton Mountain range, 

 or the northward extension of the Green Mountains of Ver- 

 mont. 



The description of the asbestus mines is continued from the 

 first report,* and a map of the ashestus-producing area accom- 

 panies it. A large map of the area surveyed has been prepared 

 and will be published on the completion of the survey of the 

 Lauren tian rocks occurring on the north end of the area 

 covered by the N.E. quarter-sheet map of the Province of 

 Quebec. 



The area reported upon includes the counties of Megantic, 

 Dorchester, Bellechasse, Levis, Montmagny, and l'Islet and the 

 south line of Quebec or the country to the south and southeast 

 of the city of Quebec and along the St Lawrence river from 

 the Jacques Cartier river, above the city, to Cape Tourmente, 

 below. The group of islands between Quebec and a point 

 opposite St. Thomas were also surveyed, from Orleans Island 

 to Cranes Island, inclusive. The several geologic systems, 

 recognized in this area, include the Devonian, Silurian, Cam- 

 bro-Silurian (Ordovician), Cambrian, and pre-Cambrian. 



Devonian. — The Devonian rocks occur in an outcrop of 

 fossiliferous limestone, which is found on the north bank of the 

 Chaudiere river, about midway between the Famine river and 

 the village of St. George. Farther to the northeast, on the 

 road leading to Ste. Justine, a very limited exposure of simi- 

 lar fossiliferous limestone occurs. The breadth of this outcrop 

 is not more than twelve to sixteen feet, and is about the same 

 in length. The outcrop on the Chaudiere river is also of very 

 limited extent. These are the only areas of rock which may 

 be said to belong to the Devonian system that are known to 

 occur anywhere in the area under consideration. Dr. Ells 

 states that the exposures resemble patches of strata which have 

 escaped denudation. A list of thirty species of fossils is given 

 from the Chaudiere locality, (pp. 10K, UK.) 



No rocks that could definitely be pronounced of Silurian age 

 were seen in the area. Some red shales were assumed to repre- 

 sent some portion of the Silurian system. Owing to the char- 

 acter and variety of the exposures, the extent of the areas 

 occupied by these rocks was largely conjectural. f 



Cambro- Silurian {Ordovician). — The formations pertaining 



* Loc. cit; Ann. Rep. for 1886, pt. J, pp. 15J-70J. Printed in 1887. 



f The Silurian rocks, described in the First Report, pp. 7 J-14J, includes a small 

 area at the narrows of Lake St. Francis, a large area stretching southwest from 

 Lake Aylmer to Stoke mountain, and a small ared in the township of Stoke, west 

 of Stoke mountain. Silurian fossils occur at a number of localities in the lime- 

 stones. A comparison of these areas, as shown on the' map accompanying the 

 report, with the areas colored Silurian, in Logan's Geological Map of Canada, 

 1864, shows that the latter included large areas of strata referred to the Lower 

 Silurian or Ordovician by Dr. Ells. 



