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The AAPG/Datapages Combined Publications Database

CSPG Special Publications

Abstract


Shelf Sands and Sandstones — Memoir 11, 1986
Pages 334-334
Symposium Abstracts: Sediment Source, Supply and Dispersal

The Bird Fiord Formation: A Spectrum of Shelf Previous HitEnvironmentsNext Hit: Abstract

Quentin H. Goodbody1

Abstract

The Middle to Upper Devonian Bird Fiord Formation, a constituent formation of the Franklinian Geosyncline, Canadian Arctic Islands, displays considerable vertical and lateral facies variation. On southwest Ellesmere Island, five informally defined members represent 1. a basal sabkha setting, 2. a carbonate-dominated shelf, 3. a clastic-dominated shelf, 4. Previous HitdeltaicNext Hit/clastic shelf interdigitation, and 5. fluvial-Previous HitdeltaicNext Hit Previous HitenvironmentsNext Hit. The change from carbonate to clastic lithology is associated with the onset of Previous HitdeltaicNext Hit sedimentation, however, shelf processes redistributed distal Previous HitdeltaicNext Hit sediments into sheet-like layers. Extensive cliff exposures permit examination of shelf lithofacies and their sequences. Broad (?tidal) channels, low-amplitude bar forms, small-scale scour surfaces and abundant rippling attest to distribution of sediment by active currents.

Delta encroachment is indicated by the introduction of extensive noncalcareous, cross-bedded, proximal mouth-bar sandstones interbedded with bioclastic shelf sequences. These mouth-bar deposits are lensoid in cliff section; their tops commonly display evidence of reworking by shelf processes. Further advance of the delta is indicated by an upward increase in non-calcareous, cross-bedded sandstones and the occurrence of well defined distributary channels. The uppermost member of the formation consists of stacked channel sequences, which probably represent a braided stream environment.

The lower carbonate members are absent on Grinnell Peninsula (Devon Island), Comwallis and Bathurst Islands. In these areas, a spectrum of shallow clastic shelf and interface Previous HitenvironmentsNext Hit (barrier island, tidal channel, lagoon, distributary channel and interdistributary bay) occur in the Bird Fiord Formation transition from carbonates of the underlying Blue Fiord Formation to the Previous HitdeltaicNext Hit Previous HitenvironmentsTop of the overlying Okse Bay Group.


 

Acknowledgments and Associated Footnotes

1 Department of Geology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3

Copyright © 2008 by the Canadian Society of Petroleum Geologists