On the north american continent, 6 cratonic sequences have been recognized.
More about cratonic sequences:
A complete cycle of marine transgression and regression on a craton (block of continental crust) over geologic time is represented by a cratonic sequence, a very large-scale lithostratigraphic sequence in the rock record. Megasequences, stratigraphic sequences, Sloss sequences, supersequences, or just "sequences" are other names for cratonic sequences.
They are geologic proof that the relative sea level has been transgressing and regressing, depositing different sediment layers onto the craton, which are now expressed as sedimentary rock. The differences between the strata that were deposited throughout time as the ancient environment changed are seen in places like the Grand Canyon as a good visual representation of this process.
Learn more about cratonic sequences here:
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Hi there!
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-AwesomeRepublic :)
It changed the life of the US bcuz they discovered more land to grow the states
The International Monetary Fund (IMF) is an organization of 190 countries, working to foster global monetary cooperation, secure financial stability, facilitate international trade, promote high employment and sustainable economic growth, and reduce poverty around the world. but should do a better job