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      The Foremost Formation is a stratigraphic unit of Late Cretaceous (Campanian) age that underlies much of southern Alberta, Canada. It was named for outcrops in Chin Coulee near the town of Foremost and is known primarily for its dinosaur remains and other fossils.


      Geology



      The Foremost Formation is the basal unit of the Belly River Group (called the Judith River Group in the United States). It gradationally overlies the marine shales of the Pakowki Formation. It consists of sediments that were eroded from the mountains to the west and carried northeastward by river systems, where they gradually prograded into the Western Interior Seaway.
      The bottom of the formation typically consists of a basal sandstone unit overlain by the interbedded coal seams, carbonaceous shales and mudstones of the Mackay coal zone. The center portion consists of interbedded sandstones, siltstones and mudstones, with minor carbonaceous shales. At the top are the interbedded coal seams, carbonaceous shales and mudstones of the Taber coal zone. The basal sandstones, which are commonly referred to as the Basal Belly River Sand, are a significant hydrocarbon reservoir in some parts of Alberta.
      The Foremost Formation outcrops along the Milk, Oldman and Bow Rivers. It is about 168 metres (550 ft) thick near Lethbridge, 107 metres (350 ft) thick near Medicine Hat, and 170 metres (560 ft) thick at Dinosaur Provincial Park.


      Paleobiota




      = Invertebrates

      =
      A variety of insects preserved in amber such as the ants Haidoterminus and Boltonimecia have been recovered from the Foremost Formation at a site near Grassy Lake, Alberta.
      The formation also includes a variety of freshwater, brackish water and marine molluscs such as Ostrea and Corbula.


      = Dinosaurs

      =
      The Foremost Formation has produced a lower diversity of documented dinosaurs than other Late Cretaceous units in the region unlike the Dinosaur Park Formation, Horseshoe Canyon Formation, and Scollard Formation. This is primarily due to their lower total fossil quantity and neglect from collectors who are hindered by the isolation and scarcity of well-exposed outcrops. The fossils are primarily isolated teeth recovered from vertebrate microfossil sites.


      See also



      List of dinosaur-bearing rock formations


      Footnotes




      References


      Ryan, M. J.; Russell, A. P. (2001). "Dinosaurs of Alberta (exclusive of Aves)". In Tanke, D. H.; Carpenter, K. (eds.). Mesozoic Vertebrate Life. Indiana University Press. pp. 279–297. ISBN 0253339073.

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    Foremost Formation - Wikipedia

    Foremost Formation - Wikipedia

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    Foremost Formation - Wikipedia

    The Foremost Formation is a stratigraphic unit of Late Cretaceous (Campanian) age that underlies much of southern Alberta, Canada. It was named for outcrops in Chin Coulee near the town of Foremost [1] and is known primarily for its dinosaur remains and other fossils. [3]

    Xenoceratops Animal Facts - Xenoceratops foremostensis - A-Z Animals

    May 27, 2024 · Fossils of the Xenoceratops were found in the Foremost Formation near the town of Foremost, Alberta, Canada. The dinosaur lived during the Late Cretaceous approximately 80 million years ago.

    Oldman and Foremost Formations of Southern Alberta

    The Oldman is a continental type of deposit consisting essentially of light gray sandstones and gray shales. The Foremost formation underlies the Oldman conformably, and is brackish-water in origin. It is composed of sandstones, silts, shales of darker hues than those of …

    Foremost Formation - Wikiwand

    The Foremost Formation is a stratigraphic unit of Late Cretaceous age that underlies much of southern Alberta, Canada. It was named for outcrops in Chin Coulee near the town of Foremost [1] and is known primarily for its dinosaur remains and other fossils. [3]

    Foremost Formation - weblex.canada.ca

    The Foremost Formation crops out between Lethbridge, Medicine Hat and Milk River in southeastern Alberta, and along the valleys of the South Saskatchewan, Oldman and Bow rivers as far north as Eyremore.

    MULTI-PROXY PALEOENVIRONMENTAL AND …

    Dec 19, 2024 · Here we describe and analyze the sedimentology, foraminiferal micropaleontology, vertebrate microsite paleoecology, and paleoenvironmental conditions of the Foremost Formation.

    Palm fronds from western Canada are the northernmost palms …

    Jun 1, 2022 · The palaeolatitude of the Chin Coulee site was calculated as 55.5° N (52.6–58.4° N) at 80 Ma. The Foremost Formation is a mostly marine rock unit—although sparse ceratopsian dinosaur remains have been recovered from the formation at Chin Coulee (Ryan et al., 2012)—that is bracketed by coals.

    DEPOSITIONAL ENVIRONMENTS, FOREMOST FORMATION (LATE CRETACEOUS…

    Paleoenvironmental interpretations based on sedimentological and micropaleontological analyses indicate that the Late Cretaceous (Campanian) Foremost Formation is transitional between the underlying marine Pakowki Formation and the overlying nonmarine Oldman Formation.

    Stratigraphy and Sedimentology of the Foremost Formation …

    The Foremost Formation is composed primarily of several distinct sandbodies contained in asymmetrical one-sided scours overlain in some areas by coally and carbonaceous deposits.

    Foremost Formation - Alchetron, The Free Social Encyclopedia

    Oct 12, 2024 · The Foremost Formation is a stratigraphic unit of Late Cretaceous (Campanian) age that underlies much of southern Alberta, Canada. It was named for outcrops in Chin Coulee near the town of Foremost and is known primarily for its dinosaur remains and other fossils.