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The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Bulletin of Canadian Petroleum Geology
Special Guide Book Issue: Flathead Valley
Vol. 12 (1964), No. 2S. (August), Pages 587-599

Stratigraphy and Microfauna of the Jurassic Fernie Group, Fernie Basin, S.E. British Columbia

I. Weihmann1

ABSTRACT

Based on two measured and sampled reference sections (Alexander Creek and Barnes Lake) the incompetent and highly contorted strata of the Jurassic Fernie group in the Fernie Basin area are divided into three mappable lithologic units. These are in ascending order: lower dark grey shaly unit (Sinemurian, Toarcian, Bajocian), middle light grey calcareous unit (Callovian) and upper dark brown sandy unit (Oxfordian, Kimmeridgian, Portlandian).

The lower shaly unit can be subdivided into three different shale sequences charcterized by mineral composition and micro faunal content: a.) phosphatic pelletoidal, b.) very fine silty, and c.) microlaminated shales with radiolarians. The Radiolaria are representative of the suborders Spumellina (=Hexastylus, Haeckel) and Nassellina (=Eucyrtidium, Ehrenberg and Theocorys, Haeckel).

The middle calcareous unit consists of a basal shale sequence followed by argillaceous siltstones and limestones, known as Grey beds. Microfossil assemblages with Ostracoda, Foraminifera and radiolarians are comparable to described Callovian faunas.

The upper sandy unit comprises the glauconitic Green beds and the Passage beds. Foraminifera (calcareous and arenaceous) are common in the lower part of the Passage beds and comparable to described Oxfordian assemblages.

Total thickness of the Fernie group measured at Alexander Creek is ±980 feet and at Barnes Lake ±930 feet. References are made to the Fernie group sequence in the BA CNP Fernie d 42 I well.


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