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From Middle Devonian times, the continental Old Red Sandstone Basin in NorthEast Greenland has accumulated more than 8 km of mainly coarse clastic sediments. These sediments have been studied for more than 100 yr, and they became world famous prior to the Second World War for the discovery of the earliest four-legged vertebrates, the tetrapods later assigned to the genus Ichthyostega. Basin initiation in East Greenland was caused mainly by extensional collapse of an overthickened Caledonian crustal welt accommodated by SE-NW–oriented dip-slip faulting and, subordinately, by N-S–oriented sinistral wrench faulting due to late Caledonian shear displacements along plate boundaries....

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