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  2. Fox Hills Formation - Wikipedia

    en.wikipedia.org/wiki/Fox_Hills_Formation

    The Fox Hills Formation is a Cretaceous geologic formation in the northwestern Great Plains of North America. It is present from Alberta on the north to Colorado in the south. Fossil remains of dinosaurs , including tyrannosaurs , as well as large marine reptiles, such as mosasaurs , have been recovered from the formation.

  3. Colorado Group - Wikipedia

    en.wikipedia.org/wiki/Colorado_Group

    The USGS convention has been to use Colorado Group where the rocks are further divided into formations, Colorado Formation where no beds are developed enough to be mapped as formations, and Colorado Shale where the unit is composed of little more than shale with no distinctive structures (such as in north-central Montana). [4]

  4. List of fossiliferous stratigraphic units in Colorado

    en.wikipedia.org/wiki/List_of_fossiliferous_str...

    This page was last edited on 18 November 2024, at 07:48 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  5. Paleontology in Colorado - Wikipedia

    en.wikipedia.org/wiki/Paleontology_in_Colorado

    Marine mollusks were preserved in the Fox Hills Formation. [16] Oysters and other mollusks were preserved in the sediments now composing the Dakota Formation. Aspects of the Coloradan flora were also preserved from this time. The most common plant fossils of the Dakota are the leaves of deciduous trees. Other contemporary plants included ferns ...

  6. Dawson Arkose - Wikipedia

    en.wikipedia.org/wiki/Dawson_Arkose

    The Dawson Arkose is a geologic formation in the Denver Basin that underlies the Denver area in Colorado. It is characterized by alternating beds of arkosic sandstone and mudstone . [ 1 ] [ 3 ] The Dawson Arkose contains plant remains [ 4 ] and other nonmarine fossils , and hosts aquifers that are important sources of water for the area.

  7. Pierre Shale - Wikipedia

    en.wikipedia.org/wiki/Pierre_Shale

    The Pierre is overlain by marginal marine deposits of the Fox Hills Formation. Most of the formation was deposited in the Campanian Age of the late Cretaceous. However, the discovery of fossils of Baculites baculus in the uppermost beds of the Pierre Shale in the Raton, New Mexico area show that deposition continued here into the early ...

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