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  • Source: Monteith Formation

    • The Monteith Formation is a geologic formation of Early Cretaceous (Valanginian) age in the Western Canada Sedimentary Basin that consists primarily of sandstone. It is present in the northern foothills of the Canadian Rockies and the adjacent plains in northeastern British Columbia and west-central Alberta.


    Lithology


    The Monteith Formation consists primarily of fine-grained argillaceous sandstone with interbeds of siltstone, dark grey mudstone, shale, and minor coal beds. Coarser-grained quartzose sandstones and minor quartz-pebble and chert conglomerates are present in some areas.


    Environment of deposition


    The Monteith Formation was deposited in marine and nonmarine environments within and adjacent to the Western Interior Seaway. Depositional settings ranged from marine to shoreline, deltaic, river channel, floodplain, and swamp environments.


    Paleontology and age


    The age of the Monach Formation formations has been determined from its fossil fauna, primarily species of the bivalve Buchia.


    Thickness and distribution


    The Monteith Formation is present in the foothills of the Canadian Rockies and the adjacent plains from the Prophet River in northeastern British Columbia to the Berland River in west-central Alberta. It attains a maximum thickness of 600 m (1,970 ft) in the foothills of British Columbia and thins eastward.


    Relationship to other units


    The Monteith Formation is the basal formation of the Minnes Group. It was deposited conformably over the marine shales of the Fernie Formation and is conformably overlain by the Beattie Peaks Formation. To the south it grades into the Nikanassin Formation.


    References




    See also



    Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
    List of fossiliferous stratigraphic units in British Columbia

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