Definition of craton
: a stable relatively immobile area of the earth's crust that forms the nuclear mass of a continent or the central basin of an ocean
cratonicplay \krə-ˈtä-nik, krā-, kra-\ adjective
Recent Examples of craton from the Web
There are some found outside those cratons (such as the kimberlites of Kentucky and Arkansas) but they are still typically found where the rocks are old.
Most kimberlites are found in areas of the oldest rocks on Earth known as continental cratons.
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Britannica.com: Encyclopedia article about craton
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