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The Cambrian System of Wyoming

The Cambrian System of Wyoming. 1.3-1.0 Ga. Grenville orogen : Continent-continent collision of Laurentia with African and South American cratons ; SE transfer of Caborca block. 1.3-0.95 Ga. Grenville orogen : Granitoids intrude juvenile belts as far west as Colorado.

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The Cambrian System of Wyoming

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  1. The Cambrian System of Wyoming

  2. 1.3-1.0 Ga Grenville orogen: Continent-continent collision of Laurentia with African and South American cratons; SE transfer of Caborca block

  3. 1.3-0.95 Ga Grenville orogen: Granitoids intrude juvenile belts as far west as Colorado

  4. Life may have survived a cataclysmic global freeze some 700 million years ago in pockets of open ocean. Snowball Earth as hypothesized during the SturtianGlaciation 700 million years ago

  5. Rodinia riftedin Neoproterozoic creating large Paleozoic continents • All continents had rifted passive margins, and developed broad continental shelves during the Cambrian through the middle Ordovician. Panthalassian ocean Siberia Prototethys Laurentia Pannotia-Gondwana Iapetus Baltica

  6. TIPPECANOE Supersequence SAUK Supersequence

  7. Baltica Laurentia Iapetus Gondwana Late Proterozoic(Ediacaran) 600 mya

  8. Global Sea level rise began in the Late Ediacaran Period and continued throughout the Cambrian, flooding interiors of continents, including Laurentia, depositing continental shelf and epicontinental sea deposits of the North American Sauk Supersequence. Laurentia Middle Cambrian 530 mya

  9. Global Sea level rise began in late Ediacaran Period and continued throughout the Cambrian, flooding interiors of continents, including Laurentia, depositing continental shelf and epicontinental sea deposits of the North American Sauk Supersequence. Laurentia Late Cambrian 500 mya

  10. Cordilleran Orogen:Cambrian passive margin

  11. Flat Head Formation • Brown Sandstone • Quartz Arenite, Medium Bedded, Cross bedded. • Lesser Green Shale and Mudstone • Lesser Micritic Limestone • Some Glauconite • Linguloid Brachiopods

  12. Gallatin and Gross Ventre Formations • Poorly exposed, valley former between resistant Paleozoic and Basement rocks. • Thin bedded, structurally incompetent. • Interbedded shale, limestone, and sandstone • Limestones are micritic, trace fossils are common, lots of intraclasts. • Greener at the base (GrosVentre), Pinker at the top (Gallatin).

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