no. i formations of beaverfoot-brisco-stanford range 39 



upper cambrian ■ 

 Lyell ? Formation : ^ 



In the absence of fossils it is a venture to correlate xormations that 

 are separated by a distance of from loo miles (160.9 km.) to 132 

 miles (212.4 km.) and on opposite sides of the Rocky Mountain Con- 

 tinental Divide, but in the case of the Lyell limestone there is a super- 

 jacent fossiliferous formation that contains a similar lower Ozarkian 

 fauna and the Hthologic and stratigraphic characters are quite sirnilar. 

 At each locality there is a thick-bedded, semi-crystalline, cliff-forming 

 magnesian limestone subjacent to the shales and interbedded lime- 

 stones of the Mons formation. The Lyell ? limestone is unlike the 

 Silurian and Devonian limestones of the Beaverfoot-Brisco-Stoddart 

 Range and unlike the Elko Middle ? Cambrian limestone of the ranges 

 to the south and southwest. Under these conditions a tentative refer- 

 ence of the limestone to the Copper Cambrian as a probable representa- 

 tive of the Lyell formation to the north of the Bow Valley-Kicking 

 Horse Canyon valleys seems to be justified. (See pp. 20, 24.) 



MIDDLE AND LOWER CAMBRIAN 



In Grainger Mountain, a few miles southeast of Sabine Mountain 

 and on the southeast side of the Kootenay Valley, strata of Lower and 

 possibly Middle Cambrian age occur which are described on page 30. 

 Unfortunately there is no section known to me where the relation of 

 the Elko Middle ? Cambrian limestone to the limestone beneath the 

 Mons is shown. That such a section exists east or southeast of the 

 Kootenay Valley is quote probable. When found it may be that some 

 of the L'pper Cambrian formations of the Bow Valley-Kicking Horse 

 Canyon sections will be discovered or their absence by nondeposition 

 established. 



About 100 miles (160.9 km.) to the north-northwest of Grainger 

 Mountain in the Dogtooth Mountains, at a locality about 4 miles 

 (6.4 km.) west of Golden and 2 miles (3.2 km.) from the mouth of 

 Canyon Creek Canyon, beside an old logging railway, a belt of quartz- 

 ites occurs with shales, in which calcareous nodules occur, interbedded 

 or above them ; these nodules contain many fragments of trilobites and 

 brachiopods of the Lower Cambrian Mt. Whyte formation, and I have 

 identified the following (68d) : 



Micromitra (Paterina) labradorica (Billings) 



Obolus cf. damo Walcott 



Acrotreta cf. sagittalis taconica Walcott 



Acrotreta sp. 



Callavia ? iicz'adaciisis Walcott 



^Smithsonian Misc. Coll., Vol. 72, No. i, 1920, p. 15. Idem. Vol. 67, No. 8, 

 1923, p. 460. 



