Sauk sequence

Sauk sequence

The Sauk sequence was the earliest of the six cratonic sequences that have occurred during the Phanerozoic (followed by the Tippecanoe, Kaskaskia, Absaroka, Zuñi, and Tejas). It dates from the late Proterozoic through the early Ordovician, though the marine transgression did not begin in earnest until the middle Cambrian. [Monroe, James S., and Reed Wicander. "The Changing Earth: Exploring Geology and Evolution," 2nd ed. Belmont: West Publishing Company, 1997. ISBN 0-314-09577-2 p. 533]

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. [Monroe and Wicander, p. 533] 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 ended early in the Ordovician, to be followed by the Tippecanoe sequence later in the period. [Monroe and Wicander, pp. 533-4]

References


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