The Turner Valley field is shown to be comprised of two Laramide structures, the Turner Valley and Millarville thrust sheets, the latter overriding the down-plunging north extension of the former. The ancestral fold and age of accumulation are pre-Jurassic and pre-Blairmore. The reservoir rock is a dolomitic biostrome so identified by the abundance of detrital crinoids etc. which form the porous zones and provide source. This relationship between the early accumulation and the age of folding together with the organic origin of the reservoir, is significant in prospecting for oil in the Paleozoics of the Foothills and Western Plains areas.

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