A cratonic sequence in geology is a very large-scale lithostratigraphic sequence in the rock record that represents a complete cycle of marine transgression and regression on a craton (block of continental crust) over geologic time. Cratonic sequences are also known as "megasequences", "stratigraphic sequences", "Sloss sequences", "supersequences" or simply "sequences". They are geologic evidence of relative sea level rising and then falling (transgressing and regressing), thereby depositing varying layers of sediment onto the craton, now expressed as sedimentary rock. Places such as the Grand Canyon are a good visual example of this process, demonstrating the changes between layers deposited over time as the ancient environment changed.
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| - Cratonic sequence (en)
- Sequenza cratonica (it)
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| - A cratonic sequence in geology is a very large-scale lithostratigraphic sequence in the rock record that represents a complete cycle of marine transgression and regression on a craton (block of continental crust) over geologic time. Cratonic sequences are also known as "megasequences", "stratigraphic sequences", "Sloss sequences", "supersequences" or simply "sequences". They are geologic evidence of relative sea level rising and then falling (transgressing and regressing), thereby depositing varying layers of sediment onto the craton, now expressed as sedimentary rock. Places such as the Grand Canyon are a good visual example of this process, demonstrating the changes between layers deposited over time as the ancient environment changed. (en)
- Il termine sequenza cratonica si riferisce ad una sequenza litostratografica su vastissima scala che copre un completo ciclo marino trasgressivo-regressivo su un cratone. Sono note anche come "megasequenze", "supersequenze", "sequenze stratigrafiche", "sequenze di Sloss" o semplicemente "sequenze." In parole semplici, rappresenta l'evidenza geologica dell'innalzamento e successivo abbassamento del livello marino, con il conseguente deposito di strati di sedimenti sulle rocce primigenie chiamate cratoni. (it)
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| - A cratonic sequence in geology is a very large-scale lithostratigraphic sequence in the rock record that represents a complete cycle of marine transgression and regression on a craton (block of continental crust) over geologic time. Cratonic sequences are also known as "megasequences", "stratigraphic sequences", "Sloss sequences", "supersequences" or simply "sequences". They are geologic evidence of relative sea level rising and then falling (transgressing and regressing), thereby depositing varying layers of sediment onto the craton, now expressed as sedimentary rock. Places such as the Grand Canyon are a good visual example of this process, demonstrating the changes between layers deposited over time as the ancient environment changed. Cratonic sequences were first proposed by Laurence L. Sloss in 1963. Each one represents a time when inland seas deposited sediments across the craton. The top and bottom edges of a sequence are each bounded by craton-wide unconformities (time gaps in the rock record). The unconformities indicate when the seas receded and sediment was eroded rather than deposited. (en)
- Il termine sequenza cratonica si riferisce ad una sequenza litostratografica su vastissima scala che copre un completo ciclo marino trasgressivo-regressivo su un cratone. Sono note anche come "megasequenze", "supersequenze", "sequenze stratigrafiche", "sequenze di Sloss" o semplicemente "sequenze." In parole semplici, rappresenta l'evidenza geologica dell'innalzamento e successivo abbassamento del livello marino, con il conseguente deposito di strati di sedimenti sulle rocce primigenie chiamate cratoni. Le sequenze cratoniche furono proposte per prima volta da nel 1963; ognuna rappresenta un periodo di tempo in cui i mari epicontinentali depositavano i sedimenti su un cratone, mentre i margini superiore ed inferiore della sequenza sono legati alla disconformità erosiva del cratone nella fase di regressione marina. (it)
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