594 WILLET G. MILLER AND CYRIL W. KNIGHT 



of the near-by town, and during the last decade they have been 

 frequently referred to in literature and classed as of Keewatin age. 

 In the summer of 19 14, however, the junior author was able to 

 verify Logan's conclusion regarding their age, and to prove that 

 they are in intrusive contact with the Animikean, as defined in 

 Table I. Hence they are classed as Keweenawan. 



The group name Animikean is explained in a preceding para- 

 graph as well as in Table I. In addition to what has long been 

 called the Animikie, it includes the usually flat-lying sediments of 

 Lake Huron, which have been classed as Lower and Middle Huron- 

 ian by various authors. There is an unconformity within these 

 sediments but we do not think it is of the magnitude that it has 

 been inferred to be. It is to be described in a forthcoming paper.^ 

 We look on this unconformity as being similar to those which have 

 been observed in the Cobalt series. As already said, the flat-lying 

 sediments of Lake Huron, the Ramsay Lake series of Sudbury, and 

 the Cobalt series, all being of post-Algoman age and no discordance 

 having been proved to exist between them and the Animikie, are 

 classed by us with the latter rocks under the name Animikean. 

 It may be added that the quartzites and jasper conglomerates of 

 the upper part of the Lake Huron series resemble rather closely 

 the upper part of the Cobalt series. As shown in Table II, Collins 

 applies the local name Whitewater series to the sedimentary rocks 

 of the Sudbury Nickel Basin. The name was given, however, by 

 Nickles and Foerste in 1905 to a part of the Richmond.^ Hence, 

 it should not be employed for the Sudbury rocks. The name 

 Fabre, which has been used by certain authors as synonymous with 

 Sudbury or Timiskaming, should also be discarded, since the rocks 

 to which the name was apphed are merely part of the Cobalt series.' 



The name Algoman was introduced by A. C. Lawson in 1913.'* 

 The authors, having found, in the areas examined by them, that 

 granite and gneiss of post-Timiskamian and pre- Animikean age are 

 of wide extent, had employed local names to designate these rocks. 

 At Cobalt the granite was called Lorrain and in southeastern 



' Ont. Bur. Mines, XXIV. 



^ U.S. Geol. Survey, Professional Paper 71, p. 172. 



3 Ont. Bur. Mines, XIX, Part II, p. 62. 



4 Compte-Rendu, 12th Int. Geol. Congress, pp. 359-61. 



