The Kaskaskia sequence was a cratonic sequence that began in the mid-Devonian, peaked early in the Mississippian, and ended by mid-Mississippian time. A major unconformity separates it from the lower Tippecanoe sequence. Beginning in the late Devonian, black shales begin to dominate in the rocks, composed of detritus eroded from the uplifted Acadian highlands to the west; they also indicate widespread anoxic conditions across the sea floor. By mid-Mississippian time however, shallow-water carbonate deposition resumed, until the final regression of the epeiric seas late in the period.
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| - The Kaskaskia sequence was a cratonic sequence that began in the mid-Devonian, peaked early in the Mississippian, and ended by mid-Mississippian time. A major unconformity separates it from the lower Tippecanoe sequence. Beginning in the late Devonian, black shales begin to dominate in the rocks, composed of detritus eroded from the uplifted Acadian highlands to the west; they also indicate widespread anoxic conditions across the sea floor. By mid-Mississippian time however, shallow-water carbonate deposition resumed, until the final regression of the epeiric seas late in the period. (en)
- La sequenza Kaskaskia è una sequenza cratonica che iniziò nel medio Devoniano, raggiungendo il picco massimo all'inizio del Mississippiano e terminando nel medio Mississippiano. Un'importante la separa dalla precedente sequenza Tippecanoe. (it)
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| - The Kaskaskia sequence was a cratonic sequence that began in the mid-Devonian, peaked early in the Mississippian, and ended by mid-Mississippian time. A major unconformity separates it from the lower Tippecanoe sequence. The basal—that is, the lowest and oldest—units of the Kaskaskia consist of clean quartz sandstones eroded from the Appalachian orogenic belt to the east, the Ozark Dome in the center of the continent, and south from the Canadian Shield. These sandstones are followed by extensive carbonates, though these are often difficult to distinguish from preceding Tippecanoe carbonates. The Kaskaskia is well known for its widespread carbonate and evaporite strata, which in fact compose most of the rocks; the Williston Basin in Canada is a superb example of such evaporite deposits. Beginning in the late Devonian, black shales begin to dominate in the rocks, composed of detritus eroded from the uplifted Acadian highlands to the west; they also indicate widespread anoxic conditions across the sea floor. By mid-Mississippian time however, shallow-water carbonate deposition resumed, until the final regression of the epeiric seas late in the period. (en)
- La sequenza Kaskaskia è una sequenza cratonica che iniziò nel medio Devoniano, raggiungendo il picco massimo all'inizio del Mississippiano e terminando nel medio Mississippiano. Un'importante la separa dalla precedente sequenza Tippecanoe. L'unità basilare—cioè la più bassa e più antica—della Kaskaskia è costituita dalle arenarie di quarzo chiaro erose della fascia orogenetica dagli Appalachi ad est, dall'altopiano d'Ozark nel centro del continente, e dallo scudo canadese a sud. Queste arenarie sono seguite da estesi carbonati, sebbene questi siano spesso difficili da distinguere dai precedenti carbonati Tippecanoe. La Kaskaskia è ben nota per i suoi diffusi strati di carbonato e di evaporite, i quali infatti entrano nella composizione della maggior parte delle rocce; il Bacino di Williston in Canada è un superbo esempio di tali depositi di evaporite. A partire dal tardo Devoniano, gli scisti neri iniziano a predominare nelle rocce, composte di detriti erosi dagli altopiani Acadiani sollevatisi ad ovest; essi indicano anche estese condizioni anossiche su tutti i fondali marini. A partire dal Mississippiano intermedio, tuttavia, la sedimentazione di carbonato nelle acque basse riprende, fino alla regressione finale dei mari epeirogenetici alla fine del periodo. (it)
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