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Ministry of Energy Mines and Responsible for Core Review

Preliminary Map No. 41: Geology of the Rock Creek Tertiary Outlier
(082E/03E, 02W)

by B.N. Church, 1980

View Map (PDF, 3.5 MB) (1:50 000)


Preliminary Map 41 presents the geology of the Rock Creek Tertiary outlier in southern British Columbia.  


The 1:50 000 scale geology map includes a legend and cross sections.


The basement rocks to the Tertiary sequence consists of pre-Cenozoic basic intrusions, including serpentinite and peridotite, and metasediments, including conglomerate, chert, argillaceous rocks, metavolcanic and metasedimentary units (Anarchist Assemblage).  There are also mainly granitic intrusions of the Late Jurassic to Early Cretaceous age . Early Cenozoic rocks of the Springbrook Formation, the Kettle River Formation, and the Marron Formation are exposed. The Springbrook Formation consists mainly of polymictic conglomerate.  The Kettle River Formation consists primarily of the Ed James Lake member, of fanglomerate, breccia and arkose, and the Storm Hill member, of sandstone that passes laterally to shale with carbonaceous seams.  The Marron Formation consists of the Yellow Lake member, which consists mainly of pyroxene-rich mafic phonolite lava and associated dikes, tuff and breccia, the Rock Creek chonolith, which is a variety of Coryell syenite, and the Kitley Lake member, which is made up of trachyandesite flows, and equivalent dikes.


Block faults with mainly north, northeast and northwest trends dominate the Tertiary map pattern. Normal and reverse movement have tilted the Tertiary strata.


The area is prospective for epithermal precious metal deposits.


All publications of the BC Geological Survey are available digitally, free of charge, from this website.


For questions or more information on geology and minerals in British Columbia contact BCGS Mailbox or call toll free (BC Residents only).