Abstract
The Borup Fiord Formation comprises red weathering, pebble to cobble conglomerates and sandstones that recorded fluvial sedimentation in a rift-related setting where tectonic highs shed coarse clastic material into adjacent lows. The Borup Fiord Formation is conformably overlain by Unit C1, which is represented by marine evaporites and minor limestones in the distal areas (Otto Fiord-like facies), and yellowish brown, fossiliferous dolostones and minor sandstones and conglomerates in the proximal areas. At the surface, the Otto Fiord Formation comprises marine evaporites (gypsum and anhydrite) interfingering with minor limestones. Unit C1, and likely correlative Otto Fiord Formation, recorded restricted marine sedimentation in a closed basin. The bulk of the Serpukhovian Borup Fiord Formation forms a broad, unconformity-bounded, progradational-retrogradational sequence, one that recorded nonmarine fluvial sedimentation in a series of fault-bounded, rift-related, northeastward-trending subbasins, the largest of which is here named the Hvitland Subbasin.
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