726 REVIEWS 



500-700 feet thick, are very fossiliferous. These fossil-bearing strata 

 are placed well down in the Archean, as in the following tabulation: 



!io. Keweenawan. 

 Erosion interval. 

 9. Animikie. 



EPARCHEAN INTERVAL 



8. Granite gneiss, intrusive in the Seine series. 



7. Seine series. 



6. Acute deformation and erosion interval. 



5. Steeprock series. Fossil-bearing. 



4. Erosion interval. 



3. Granite gneiss, intrusive in the Keewatin. 



2. Keewatin. 



1. Coutchiching. 



Walcott first identified the fossils as Archaeocyathinae, which are 

 found elsewhere in the Lower Cambrian formations. Later, on the 

 strength of microscopic examination, he called them a new genus, 

 Atikokania. He found them apparently related to both the Archaeo- 

 cyathinae and to the sponge Syringocnema. They are quite unlike any 

 of the Beltina fauna. If their stratigraphic position were not surely 

 determined, Walcott would consider them to be of Lower Cambrian 

 age. T. T. Q. 



The Huronian Formations of Temiskaming Region, Canada. By 

 W. H. Collins. Geol. Surv. Canada, Museum Bull. No. 8, 

 1914. Pp. 33, pi. 1, figs. 2. 



The formations in the "Original Huronian" district have been cor- 

 related with the well-known sections at Sudbury and Cobalt. Six 

 type localities were successively studied in the region, and the forma- 

 tions were traced across the intervening spaces. It was certified that 

 the original Huronian sedimentaries consist of two distinct series, 

 separated from one another by a large erosion interval, and separated 

 from the pre-Huronian rocks by a great interval of diastrophism, granite 

 intrusion, and erosional peneplaination. It has been determined that 

 the Cobalt series of Cobalt, the Ramsey Lake conglomerate of Sudbury, 

 and the slate conglomerate of the upper of the two series in the original 

 Huronian are equivalents. 



Instead of Upper and Lower Huronian, Collins calls the upper of 

 these series Cobalt and the lower one the Bruce series. Elsewhere, the 



