It is believed to have been formed by extension, between two fault-bounded blocks which rotated anti-clockwise to take up the compression resulting from Europe's collision with Africa.
The basin is filled with turbidites and evaporites of the Tortonian-Messinian ages of the Miocene Epoch.
[1][2][3] The basin is divided into the following members: The basin was separated from the main Mediterranean basin during the Messinian salinity crisis; therefore the timing of the Yesares Member relative to the main basin evaporites is crucial to distinguish between models of how the Mediterranean dried out.
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