NO. lO DISCOVERIES OF CAMBRIAN BEDS RESSER 7 



boundary. This shale occurs in the southward extension of Daly's 

 Pend Oreille group or Summit series. This does not necessarily re- 

 move either series from the Beltian, but probably indicates conditions 

 similar to those described for the Rocky Mountain Beltian area north 

 of Helena, Mont. This shale is part of a limestone belt lying between 

 two mountain ranges of quartzite and schist. Besides the shale and 

 limestone, from which other Paleozoic faunas have been collected, 

 graptolitic argillites are present, which are now being studied by Dr. 

 Ruedemann. The IMiddle Cambrian fossils in the shales are Elrafliia 

 aff. cordillerae, Pagetia cf. hootes, Kootenia sp., Olenoides, and 

 Westonia, all typical of the Stephen formation, very common in the 

 Rockies about Lake Louise, Alberta, and Field, British Columbia. 



Localities near Colville. — In 193 1 C. C. Branson reported Kiitor'- 

 gina, a genus confined to the Lower Cambrian, from the Stevens 

 series on the Colville River, 6 miles north of Chewalah, Wash., a 

 locality about 40 miles southwest of Metaline Falls. The Stevens 

 series formerly was also regarded as Beltian in age, and as stated for 

 the Pend Oreille group, it probably is Beltian but was covered with 

 Cambrian beds, fragments of which remain in the infolded synclines. 



A second Lower Cambrian locality was found by Mr. Bennett, who 

 sent in a single piece of limestone from the town of Colville. This 

 limestone contains fragments that ajjpear to represent Wanncria, or 

 at least an olenellid trilobite, accompanied by several cups of Archac- 

 ocyathits. Taken together, these two discoveries unquestionably extend 

 the known range of Lower Cambrian strata far southwest of the most 

 southerly locality previously known in Canada. This was at Cranbrook 

 in southeastern British Columbia, and in or west of the Rocky 

 Mountain Trench, which is the western limiting feature for the Rocky 

 Mountain system. However, it is not clear whether we should regard 

 this occurrence as being in the Purcell or in the Rocky Mountain 

 systems. On the other hand, without doubt, the Washington Lower 

 Cambrian localities are west of the Purcell Trench and, therefore, in 

 the Selkirk system. 



Kettle Falls. — Finally, Mr. Bennett secured another piece of fos- 

 siliferous rock a few miles east of the Columbia River, at Kettle Falls, 

 10 miles west of Colville, containing a pocket in which occur silicified 

 fragments of Nisusia, Hyolithcs, and a small, smooth trilobite sug- 

 gesting Agnostus. This small fauna could be either Lower or Middle 

 Cambrian, but seems to be the latter. This piece of rock is from an 

 argillaceous quartz conglomerate, lying between two masses of schis- 

 tose greenstone and grit. The conglomerate itself is much metamor- 



