Upper Oligocene (Kliwa) sands containing oil residues occupy an anomalous structural position low on the south flank of the Surani anticline, and are considered to represent a reservoir whose formation and depletion took place prior to development of the present anticline and its southward thrusting along the Carsta fault in Miocene time. Pliocene (Meotic) sands exposed by erosion on the crest of the anticline and present in an outlier on the north flank also represent a depleted reservoir, in normal position relative to the structure. The Surani occurrences support the concept of indigenous origin of oil in Pliocene beds of Romania.

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