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At the time when the disintegration of Laurasia is thought to have taken place, block faulting, marine transgression, and basalt extrusion marked the geologic evolution of northern West Greenland.

The downfaulting of the western seaboard of the area probably began in Cretaceous time. Considerable thicknesses of limnic arkose accumulated rapidly in the newly-formed depression, and coarse conglomerate was deposited at the foot of the fault scarps. Pauses in sedimentation allowed substantial accumulation of plant debris which gave rise to coal layers.

In late Turonian time a marine sea carrying a North American ammonite fauna transgressed outer Svartenhuk, and, during...

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