Kamloops magmatic belt 

(early Tertiary) 

(Central and southern Canadian Cordillera, units Tv, Tpf)

Consists chiefly of 55-46 Ma, calc-alkalic to alkalic felsic, intermediate and mafic volcanic and 
sedimentary strata, and comagmatic granodiorite, syenite, and quartz monzonite plutonic rocks. The 
volcanic rocks may be surface equivalents of early Tertiary plutonic rocks in the eastern Coast Belt 
(youngest part of Coast-North Cascade belt). In parts of south-central British Columbia and northeastern 
Washington, the belt is typically alkalic, and emplacement was concurrent with widespread basin-and-
range style extension. For paleomagnetic determinations, grade A data from 49 Ma volcanic rocks indicate 
no displacement with respect to North America within error limits (7o+10o). REFERENCES: Ewing, 
1980; Parrish and others, 1988; Symons and Wellings, 1989.