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University of California . 



[Vol. 3. 



of Lake Huron. Leaving out of consideration for the. moment 

 the Coutchiching series, which appears to be rather characteristic 

 of the west than of the east, we have in western Ontario and 

 Minnesota the Lower Keewatin invaded by granite-gneisses and 

 overlain unconformably by the Upper Keewatin, with a basal 

 conglomerate, (Ogishke conglomerate) all antedating the 

 Eparchaean Interval; i. e., overlain unconformably by the Anim- 

 ikie. On the south shore we have various crystalline schists, 

 without doubt the metamorphic products of clastic and volcanic 

 rocks, invaded by granite-gneiss and overlain unconformably 

 by the Lower Marquette, and all antedating the Epai'chsean 

 Interval; i. e., overlain unconformably by the Animikie. North 

 of Lake Huron we have similarly, the Lower Huronian invaded 

 by granite-gneiss and overlain unconformably by the (Upper) 

 Huronian. In view of this parallelism of sequence we may 

 formulate a tentative correlation as a reasonable working hypoth- 

 esis, correlating the Upper Keewatin, Lower Marquette and 

 (Upper) Huronian as having the same position in the general 

 sequence, and much resemblance from a stratigraphic and petro- 

 graphic point of view. Similarly we may correlate the Lower 

 Keewatin with the Lower Huronian, and with the crystalline 

 schists of the south shore which unconformably underlie the 

 Lower Marquette. Such a scheme of correlation is, to say the 

 least, much more satisfactory and consistent as an hypothesis 

 than that which has been put forward by the geologists of the 

 south shore of Lake Superior. It detracts in no way from the 

 splendid contributions to geology which have been made by those 

 geologists, but, on the contrary, illuminates their results and 

 adds to them the element of consistency which they at present 

 lack. It expresses the views which I have held steadily for many 

 years as to the erroneous correlation of the Animikie with the 

 Huronian, it accords with the recent facts and opinions advanced 

 by Coleman and Willmott, and, if I mistake not, it expresses 

 the views entertained by the Canadian geologists, whose pioneer 

 work in this great field deserves a better fate than to be lost in 

 the awful gulf of the Algonkiau — all the pre-Cambrian elastics — 

 the bottomless pit itself. 



As regards the scheme of nomenclature which would ensue 



