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| Belloy Formation | |
|---|---|
| Name | Belloy Formation |
| Type | Geological formation |
| Period | Carboniferous |
| Primary lithology | Dolomite, sandstone |
| Other lithology | Shale, siltstone |
| Region | Western Canada Sedimentary Basin |
| Named for | Belloy |
| Named by | D.F. Stott |
| Year | 1950s |
Belloy Formation
The Belloy Formation is a Late Carboniferous to early Permian carbonate and clastic unit of the Western Canada Sedimentary Basin, recognized in Alberta and northeastern British Columbia. It is important to Western Canadian Sedimentary Basin regional correlations, influences exploration in the Peace River Country, and figures in stratigraphic frameworks tied to work by Geological Survey of Canada and provincial agencies such as Alberta Geological Survey and British Columbia Geological Survey. Major studies cite datasets from institutions including University of Alberta, University of Calgary, and industry operators such as Canadian Natural Resources Limited and Imperial Oil.
The Belloy Formation comprises dominantly dolomitized carbonate and subordinate quartzose sandstone, interbedded with argillaceous shale and siltstone. Lithofacies descriptions relate to cores logged by services like Schlumberger and mapped in regional cross sections produced by consultants such as Golder Associates and Stantec. It conformably overlies older Pennsylvanian units correlated with the Rundle Group and is overlain by Permian strata equivalent to the Schooler Creek Formation and other units tied to the Beaverhill Lake Group. Stratigraphic nomenclature and correlation work reference regional markers used by the Canadian Stratigraphic Nomenclature Committee and successive editions of the Lexicon of Canadian Geological Units.
Biostratigraphic constraints place the Belloy in the latest Carboniferous to earliest Permian interval, constrained by fusulinid and foraminiferal assemblages in carbonate horizons examined alongside conodont biostratigraphy performed by researchers affiliated with Geological Survey of Canada and university paleontology groups. Reported fossils include calcareous microfossils and sparse macrofauna recovered from cores and outcrops near the Peace River. Paleontological work has been cross-referenced with global stage schemes advanced at international meetings such as the International Geological Congress and calibration efforts by the Paleontological Society.
Depositional models interpret the Belloy as formed in a range of shallow marine to nearshore settings, including tidal flats, shoal complexes, and restricted lagoons that later underwent early diagenetic dolomitization. Comparative analogue studies cite modern and ancient systems discussed in literature from institutions such as Scripps Institution of Oceanography and the Smithsonian Institution. Sedimentologic and petrographic analyses indicate interplay of siliciclastic input from hinterland sources linked to paleogeographic reconstructions of the Laurentia margin and eustatic signals considered in frameworks developed by researchers associated with the Society for Sedimentary Geology.
The Belloy Formation extends across northern Alberta into northeastern British Columbia, with mapped occurrences in the Peace River Arch region and outcrops mapped near localities such as the community of Belloy, Alberta and along corridors adjacent to the Mackenzie Highway. Thickness varies laterally from a few metres at the basin margin to over 100 metres in depocentres documented in seismic interpretations by companies like CGG and Hess Corporation. Regional mapping integrates datasets from the National Energy Board (now Canada Energy Regulator), provincial well databases, and academic field campaigns.
The Belloy has been targeted as a reservoir interval in unconventional and conventional exploration, with porosity developed in dolomitized carbonates and in quartz-rich sandstone facies producing hydrocarbons documented in wells drilled by operators including Cenovus Energy and Suncor Energy. Reservoir studies employ petrophysical logs from vendors such as Halliburton and basin modeling developed alongside work by the Canadian Society for Unconventional Resources. The unit’s seal potential, trap styles, and production history are analyzed in context with regional plays like the Montney Formation and stratigraphic trapping investigated by industry consortia and regulatory bodies such as Alberta Energy Regulator.
The formation was named in mid-20th-century work by provincial and federal geologists, with formal description appearing in successive bulletins and memoirs produced by the Geological Survey of Canada and provincial surveys. Key contributors to its characterization include researchers at the University of Alberta and mapping efforts coordinated with industry partners in the postwar expansion of Canadian petroleum exploration, documented in proceedings of the Canadian Society of Petroleum Geologists and regional field guides published by organizations such as the Alberta Geological Society.
Category:Geologic formations of Alberta Category:Carboniferous geologic formations Category:Permian geologic formations