Abstract
During the Kimmeridgian, the southern part of the Lusitanian basin immediately north of Lisbon became differentiated into three subbasins. The northern Bombaral subbasin is a salt withdrawal structure flanked by salt walls and pillows. To the south, two north-south-trending half-graben subbasins occur, bounded by westward-dipping faults. The Arrude subbasin is the eastern basin of this pair. The siliciclastic Abadia Formation occurs in all three subbasins, and a carbonate-dominated time-equivalent sequence occurs to the southwest.
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