1876.] 3 [Hunt 



being probably the northwest side of an overturned anticlinal, so that 

 the Sillery is in fact the oldest member of the series, and was followed 

 by the Lauzon and the fossiliferous Levis limestone, to which suc- 

 ceeded the graptolitic shales, the newest portion of the Quebec group, 

 corresponding to the Arenig or Skiddaw rocks of Great Britain. 

 The Levis has a fauna equivalent to that of the Tremadoc and 

 Dolgelly rocks of that country. 



His conclusion from these facts was that the great mass of Lauzon 

 and Sillery rocks should represent the lower divisions of the Lingula 

 flags (Festiniog and Maentwrog), and perhaps also the older Mene- 

 vian and Harlech rocks of Great Britain. These inferior strata in 

 Canada have afforded, as yet, but few organic forms, but Mr. Billings, 

 just before his lamented death, informed the speaker that the Obolella 

 already mentioned from the Sillery, and an Orthis lately found near 

 the same horizon, were both clearly Menevian species. 



The relations of these rocks in Canada were illustrated by numer- 

 ous sections, and the parallelism and harmony between the Quebec 

 group, as rightly determined, and the Cambrian rocks of Great 

 Britain and Scandinavia were insisted upon. It was urged, however, 

 that the name given by Logan to the group, should be rejected as 

 misleading, although that of Levis, as designating an horizon of fos- 

 siliferous strata of Tremadoc age, might be advantageously retained 

 in American geology; care being taken to distinguish it from the 

 Quebec graptolitic zone, which is of the age of the Skiddaw or 

 Arenig rocks of Great Britain. 



Sir W. E. Logan gave a farther extension to the name of the 

 Quebec group by the supposition that a great series of crystalline 

 schists to the south and east of this fossiliferous Cambrian belt was 

 no other than these same rocks in an altered or so-called meta- 

 morphic condition. In accordance with this hypothesis, he extended 

 the name of the Quebec group over a broad belt of crystalline rocks 

 from the St. Lawrence to Virginia, as represented on his large geo- 

 logical map. These crystalline strata, however, include the Lower 

 Taconic of Emmons, the Montalban, the Huronian, and even por- 

 tions of Laurentian, although near Quebec they are of Huronian 

 age. The author many years since pointed out that the fossiliferous 

 Levis strata near Quebec hold in their conglomerates pebbles de- 

 rived from the crystalline Huronian schists which were described 

 by Logan as altered Levis and Lauzon rocks. These crystalline 

 schists were bv Logan maintained to belong to this horizon because 



