Bowser sedimentary assemblage 

(Middle Jurassic (Bathonian) to Early Cretaceous (Albian) 

(Central and southern Canadian Cordillera, unit KJs)

Consists chiefly of siltstone, shale, sandstone and conglomerate representing mainly shallow-marine, 
deltaic and nonmarine clastic rocks of the Bowser Lake Group. These rocks generally grade upward from 
marine to nonmarine (Eisbacher, 1974; Evenchick, 1991 a, b). Bowser assemblage interpreted as a foreland 
basin deposited on Stikinia terrane. Most of the detritus in the Bowser assemblage is derived from the 
Cache Creek terrane to the north and east (Gabrielse, 1991). The Bowser Lake Group is underlain by the 
fine-grained clastic Toarcian to Aalenian Spatzizi Group, which is composed mainly of shale with minor 
volcanic rocks, and may represent a pre-Bowser starved basin sequence that reflects the Early to Middle 
Jurassic accretion of Cache Creek terrane to the eastern margin of the Stikinia terrane. REFERENCES: 
Eisbacher, 1974; Evenchick, 1991a, b; Gabrielse, 1991; Ricketts and others, 1992