ON THE HOCKS OP THE QUEBEC GROUP. 189 



tails. In regard to the main features of the structure however, 

 there appears to be no doubt; namely that the Middle and South 

 Ridges are two well marked anticlinals, and that a synclinal, not 

 less so, runs between the Middle and North Ridges, repeating the 

 whole mass of strata. 



From the foregoing explanation you will be able to understand 

 how the fossils enumerated in the description of 1860 are related 

 to the conglomerate bauds, as represented on the map. The 

 whole of these fossils were collected by the officers of the Survey, 

 who are all perfectly aware of the importance of observing the 

 exact stratigraphical place of the organic remains, and always 

 most carefully do so. The collectors were Messrs. Billings, Richard- 

 son, Bell, and myself; and from the statements made to me by my 

 colleagues and assistants, I am quite prepared to assert that the 

 specimens referred to B 3 , B 2 , B 1 , A, A 1 , and A 3 , are from the 

 bands marked on the map by those letters. AVith the exception of a 

 single specimen of the pygidium of Baihyurus Saffordi, obtained by 

 Mr. Sterry Hunt from the band 4 (A 3 ), where it crosses the more 

 northern synclinal axis near the Redoute; the band A 2 afforded 

 to my late regretted and talented young scientific friend, Mr. John 

 Head, and myself, the first collection of fossils obtained by the Sur- 

 vey at Point Levis. These were taken from the whitish limestone 

 masses associated with the bed, where it crosses the fief Ste. Anne, 

 and the opinion in regard to them expressed by Mr. Billings, induced 

 me to instruct Mr. Bell to make a farther collection on the same band. 

 In addition to the fossils collected by Mr. Head and myself from the 

 band, there are some by Mr. Richardson, and others by Mr. Bell, 

 all from the fixed rock ; but in Mr. Bell's collection there are, in 

 addition, those from the limestones designated by Mr. Billings as 

 Nos. 1 and 3. These limestones were not, like the rest, firmly at- 

 tached to the band, and as they have been by Mr. Marcou designated 

 as two loose boulders, lying on the superficial soil, while he carries 

 them away from their true site, and approximates their position 

 to the lime-kiln of the Redoute, in order to affiliate them to that 

 mass, it will be necessary for me to describe their mode of occur- 

 rence. 



On the fief Ste. Anne, the band 3 (A 2 ) dips to the southeast 

 at a high angle. It is from about twenty to twenty-five feet thick, 

 and in its calcareo-magnesian base it holds a great many masses 

 of yellowish-white limestone, in which fossils are apparent, and 

 somewhat abundant. It is underlaid by slates; and in some 

 parts a sudden step to the underlying slates occurs atj its 



