conflicting Views of Lake Superior Stratigraphy. 129 



Besides the reason already mentioned for placing the Huro- 

 nian as the equivalent of the Animikie and Upper Marquette 

 rather than below these series, we have one characteristic feat- 

 ure which is of some weight. 



One of the most peculiar rocks of the Original Huronian is 

 a conglomerate which carries numerous fragments of blood-red 

 jasper. At present the source of these fragments is unknown. 

 From what has gone before it is apparent that a jasper con- 

 glomerate is the basal member of the Upper Marquette Series, 

 and also that similar conglomerates occur in a like position in 

 Ontario and northeastern Minnesota. Considering the wide- 

 spread character of this jaspery, cherty and iron ore conglomer- 

 ate, its occurrence in the Huronian of Lake Huron suggests 

 that here may be found in the future an underlying series 

 which bears this jasper in large quantity and which therefore 

 will in position and in lithological character, be the equivalent 

 of the Lower Vermilion and Lower Marquette iron-bearing 

 series.* 



In this connection it is to be said that Mr. McKellar, in the 

 article already cited, argues that the Animikie is newer than 

 the Original Huronian because of the great unconformity 

 which maintains between the Animikie series and the underly- 

 ing schists of western Ontario which he regards as Huronian. 

 The weak point of this argument is the assumption that those 

 underlying schists are more nearly like the Original Huronian 

 than are the Animikie rocks. The author states that he has 

 not himself closely studied the Original Huronian, while the 

 later writers who have visited both regions, including Prof. 

 Irving and the Profs. Winchel], agree that the Original Hu- 

 ronian is far more nearly alike, both in essential lithological 

 character and in conditions of metamorphism, to the Animikie 

 series, than to the folded schists of Canada and Vermilion 

 Lake iron -bearing rocks, and with this view our later work 

 work accords. 



The Sioux Quartzites , St. Louis Slates, etc. — Much of what 

 has been said to show that the Original Huronian is the equiva- 

 lent of the Animikie, Upper Vermilion and Upper Marquette 

 applies with equal force to such rock series as the Chippewa 

 Quartzites, the Baraboo Quartzites, the Sioux Quartzites and 

 the St. Louis Slates. JSTone of these series are closely folded 

 although often, dynamic movements have developed slaty cleav- 

 ages. Also their original fragmental character is seen under 



* Since this paper was written, Alexander Winchell has announced the dis- 

 covery of an unconformity in the Original Huronian area, the "Lower Slate Con- 

 glomerate " belonging below the break, although no contacts are described. If 

 this conclusion is correct, we have here as in other districts two series above the 

 fundamental complex and the analogy is complete (Am. Geol., vol. vi, p. 370). 



