Bio-, Chemo-, and Magnetostratigraphy of the Productive Series

Biostratigraphic characteristics of PS deposits in the Absheron oil/gas-bearing region are relatively well worked out. Faunal complexes established in the PS outcrop within the Kirmaki and Yassamal valleys of the Absheron peninsula are described below. The Kala suite deposits contain, on a level with redeposited Miocene foraminifera Nonion granosus Orb., Elphidium macellum (Ficht. et Moll.), and other, also the relict Pontian Ostracoda Cytherissa bogatschovi Liv., Cyprideis littoralis (Brady), Loxoconcha cf. djaffarovi (Schneid.) and others. These deposits have not been exposed anywhere and are known by drilling data only. In the Kirmaki valley, the PS section begins from the UKS deposits transgressively overlapping the Pontian regio-stage clays. Here, 22 species of Pontian Ostracoda were discovered, and a large quantity (more than 30) of bivalve mollusk shells Corbicula fluminalis (Muller).