Tippecanoe sequence
{{Infobox rockunit
| name = Tippecanoe Sequence
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| type = Sequence
| age = Dapingian-Emsian
~{{Fossil range|470.0 |389.0}}
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| country = United States
Canada
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| subunits = Cayugan Series
| underlies =Kaskaskia sequence
| overlies =Sauk sequence
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The Tippecanoe sequence was the cratonic sequence or the marine transgression following the Sauk sequence; it extended from roughly the Middle Ordovician to the Early Devonian. The Tippecanoe is bound by two Unconformities, at the base by the Knox Unconformity, and at its top the Wallbridge Unconformity.
Sedimentary characteristics
After the regression of the Sauk Sea early in the Ordovician, the exposed craton for a time underwent vigorous erosion, due to being located in a tropical climate; indeed, at this point in the Paleozoic the North American continent roughly straddled the equator.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}} pp. 533-4
The Tippecanoe transgression ended this period of erosion, beginning with the deposition of clean sandstones across the craton, followed by abundant carbonate deposition.Monroe and Wicander, pp. 534-5 In the east these carbonates gradually become shales, representing sediments eroded from highlands created in the Taconic orogeny.
The Tippecanoe sequence may have been the deepest of the Paleozoic. At one point during the Silurian period, the Taconic highlands, were the only part of North America that was not submerged.Monroe and Wicander, p. 537 The massive evaporite deposits of the Michigan Basin and parts of the Appalachian Basin were formed during this period.Monroe and Wicander, pp. 537-8
The Tippecanoe sequence ended with a regression in the early Devonian, to be followed later by the Kaskaskia sequence.
References
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Category:Ordovician United States
Category:Silurian United States
Category:Devonian United States
Category:Paleozoic United States
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