Simplified reconstruction of the paleocontinent of Laurentia, during the Middle Ordovician. During this time, Utah was part land and part carbonate shelf at the equator. (Modified from Marenco and others, 2016, Increasing global ocean oxygenation and Ordovician radiation—Insights from Th/U of carbonate from the Ordovician of western Utah: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 458)

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