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In addition, a number of papers were presented, for comparative purposes, on other margins and analogues from older rifted margins now exposed on land.
At that time, the weak plate rifted and formed a trough, a relatively common occurrence in young oceanic lithosphere.
The crust beneath divergent margins consists of, from land to ocean, prerift continental crust 30 to 40 kilometers thick composed primarily of granite, transitional rifted crust, and oceanic crust 6 to 7 kilometers thick that is mostly made up of basalt.