July 20, 1917] 



SCIENCE 



67 



rence of deforming forces ■wliicli locally 

 severely flexed the Tertiary formations but in 

 general disposed them in broad open folds. 

 Quaternary time has been marked by erosion, 

 glacial as well as fluvial, and there are some 

 suggestions of a recent, slight, negative move- 

 ment of the strand line. 



A valuable correlation table of formations 

 of Graham Island and neighboring districts 

 faces page 118 of this excellent report. 



Flathead Valley. — The Flathead coal basin, 

 occupying a portion of Flathead Valley in 

 British Columbia near the international 

 boundary, is described in another memoir by 

 the same author.- Bedrock formations range 

 from strata which are probably Devonian to 

 those of Eocene age. At the base are black 

 limy sandstones and shales which have not 

 yet yielded identifiable fossils but are re- 

 ferred to as " Devono-Carboniferous." Grey 

 and black limestones conformably overlie the 

 shales and range in age from Upper Missis- 

 ippian to Lower Pennsylvanian, according to 

 Girty's interpretation of two lots of fossils 

 obtained from the middle and near the top of 

 the formation. Above these limestones a 

 white, quartzose sandstone was found. It is 

 provisionally referred to the Triassic because 

 of its position beneath the Fernie shales 

 which elsewhere have been proved to be of 

 Jurassic age. (The lithologic similarity be- 

 tween this Triassic ( ?) sandstone and the 

 Jurassic La Plata sandstone of Colorado is 

 noteworthy.) The Fernie formation is con- 

 formably overlain by the coal-bearing Koote- 

 nay sandstones and shales. The Kootenay 

 beds were " accumulated in a long lake of 

 varying depth, or, more probably, in a chain 

 of lakes and swamps extending along what is 

 now the axis of the Eocky Mountains." They 

 are of Lower Cretaceous (Comanchean) age. 

 Upper Cretaceous conglomerates and sand- 

 stones are believed to represent the Dakota 

 formation. Orogenic disturbance during the 

 Laramide revolution was followed by the de- 

 position of the Kishinena formation during 



2 J. B. MacKenzie, ' ' Geology of a Portion of the 

 Flathead Coal Area, British Columbia," Geol. 

 Surv.. Canada, Mem. 87, 1916. 



Tertiary time. The Kishinena beds are of 

 freshwater origin and may be of Eocene age. 



CAMBRIAN 



Trilobites. — A recent number'' of Walcott's 

 memoirs on Cambrian Geology and Paleon- 

 tology contains descriptions and figures of 

 several trilobites, some of them new, from the 

 Lower and Middle Cambrian of ISTewfound- 

 land, Quebec, Alberta, and British Columbia. 

 C orynexoclms senectus serves to correlate the 

 upper beds of the Olenellus series of ISTewfound- 

 land with the top of the Mount Whyte forma- 

 tion in the Lower Cambrian of British 

 Columbia. A new subgenus of Corynexochus 

 is named Bonnia, and to it are referred two 

 closely allied species, one from the Mount 

 Whyte formation and the other from the 

 Lower Cambrian of Labrador and Quebec. 

 To the genus Bathyuriscus are referred a new 

 species from the Stephen formation near 

 Field, B. C, and a new subgenus, Foliella, 

 which comprises several small-tailed trilobites. 

 Most of them are of Middle Cambrian age, 

 but one occurs in the Mount Whyte formation 

 and lived near the close of Lower Cambrian 

 time. Dolichometopus and Ogygopsis receive 

 thorough treatment and Olenellus gilherti is 

 transferred to the genus Mesonacis on the 

 basis of data derived from a Mount Whyte 

 specimen. A new genus, Pageiia, is founded 

 upon material from the Burgess shale member 

 of the Stephen formation near Field. 



New Brunswiclc. — A brief but important 

 paper by G. F. Matthew* contributes to knowl- 

 edge of the paleogeography of eastern Canada 

 in early Cambrian time. The relations of 

 Cambrian rocks in New Brimswick are pre- 

 sented in tabular form. At the base is found 

 the non-fossiliferous Coldbrookian terrane, 

 composed largely of volcanic rocks, overlain 

 by the Etchiminian slates and sandstones 

 with a scanty fauna of Hyolithes and Oholus. 

 The overlying Acadian division of the St. 

 John group is much more extensive because 



sC. D. Walcott, "Cambrian Trilobites," Smith- 

 sonian Misc. Coll., Vol. 64, pp. 303-456, 1916. 



•♦ G. F. Matthew, "Kotes on Cambrian Faunas," 

 No. 12, Trans. Boy. Soc. Canada., Ser. 3, Vol. 10, 

 Sec. 4, pp 45-54, 1916. 



