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- The Sauk sequence was the earliest of the six cratonic sequences that have occurred during the Phanerozoic in North America. It was followed by the Tippecanoe, Kaskaskia, Absaroka, Zuñi, and Tejas sequences. The sequence dates from the late Proterozoic through the early Ordovician periods, though the marine transgression did not begin in earnest until the middle Cambrian. It is one of the most striking cratonic sequences in the geological record, spreading sheets of sandstone across basement rock deep into the interiors of many continents. The transgression took place rapidly, advancing over 300 kilometers (190 mi) across the Grand Canyon region in less than five million years. At its peak, most of North America was covered by the shallow Sauk Sea, save for parts of the Canadian Shield and the islands of the Transcontinental Arch. The stratigraphy of the Sauk sequence indicates shallow-water deposition, primarily consisting of well-sorted sandstones and clastic carbonates. A marine regression ended the Sauk sequence early in the Ordovician, to be followed by the Tippecanoe sequence later in the period. The transgression is attributed to thermal subsidence following the breakup of the supercontinent of Rodinia, combined with a rise in global sea level due to climate change or shifts in global tectonics. (en)
- La sequenza Sauk fu la più antica delle sei sequenze cratoniche che avvennero durante il Fanerozoico (seguita da Tippecanoe, Kaskaskia, Absaroka, Zuñi, e Tejas). Si estese dal tardo Proterozoico fino all'inizio dell'Ordoviciano, sebbene la trasgressione marina non inizi in modo serio fino al Cambriano intermedio. Al suo massimo, la maggior parte del Nord America era coperta dalle acque poco profonde del Mar Sauk, salvo parti dello Scudo canadese e le isole dell'. La stratigrafia della sequenza Sauk indica una sedimentazione in acque basse, principalmente costituita da arenarie e clasti carbonatici ben assortiti. Una regressione marina pose fine alla sequenza Sauk all'inizio dell'Ordoviciano, per essere poi seguita dalla sequenza Tippecanoe nello stesso periodo. (it)
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- The Sauk sequence was the earliest of the six cratonic sequences that have occurred during the Phanerozoic in North America. It was followed by the Tippecanoe, Kaskaskia, Absaroka, Zuñi, and Tejas sequences. The transgression is attributed to thermal subsidence following the breakup of the supercontinent of Rodinia, combined with a rise in global sea level due to climate change or shifts in global tectonics. (en)
- La sequenza Sauk fu la più antica delle sei sequenze cratoniche che avvennero durante il Fanerozoico (seguita da Tippecanoe, Kaskaskia, Absaroka, Zuñi, e Tejas). Si estese dal tardo Proterozoico fino all'inizio dell'Ordoviciano, sebbene la trasgressione marina non inizi in modo serio fino al Cambriano intermedio. Una regressione marina pose fine alla sequenza Sauk all'inizio dell'Ordoviciano, per essere poi seguita dalla sequenza Tippecanoe nello stesso periodo. (it)
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- Sequenza Sauk (it)
- Sauk sequence (en)
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