The article examines the traditional ideas about the time of occurrence of the orogen of the Greater Caucasus and the West Kuban trough. It is noted that, according to these ideas, the Greater Caucasus and the adjacent deflections, into which the demolition of material from the orogen took place, already existed since the Oligocene or Miocene. The new research results on the structure of the Pre-Caucasian bends, including the West Kuban, enables to dispute these ideas. The tectonic nature and history of filling the West Kuban trough was studied. Using the example of the FR050805 seismic profile, in the near-meridional direction of the sectioning trough at the longitude of the Varnavensky reservoir, it is shown that the clinoforms in the strata up to the Pliocene are oriented from north to south. This indicates that the filling of the trough occurred by lateral expansion of the section due to the introduction of detrital material from the north i.e. from the East European continent by the marine sedimentation in conditions of relative deep water. These conclusions are supported by the results of U–Pb isotope dating (LA-ICP-MS, GIN RAS) of detrital zircon grains from sands (sample K23-013) in the Pliocene sequence (Sennoe formation or undifferentiated sediments of the Sennoe and Zheleznogorsk formations), distributed west of Krymsk, west of Krasnodar Territory, south side of the Western-Kuban deflection.
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