. Bulletin of the Natural Histort Museum. Geology series. REVIEW OF STRATIGRAPHY OF EASTERN PARATETHYS 35 diatomaceous limestones). The individual Eastern Paratethyan stages can be recognised within the Diatom Suite on the basis on fish otoliths and benthonic microfossils (particularly molluscs and foraminifera (, Azizbekov, 1972; Ali-Zade et al., 1986) and diatoms ( Ateava, pers. comm., 1994)). The work of Dzhabarova (1973) suggests that palynology may also be used to recognise the various stages (see notes below). In eastern Azerbaijan parts of the Diatom Suite are considered to have
. Bulletin of the Natural Histort Museum. Geology series. REVIEW OF STRATIGRAPHY OF EASTERN PARATETHYS 35 diatomaceous limestones). The individual Eastern Paratethyan stages can be recognised within the Diatom Suite on the basis on fish otoliths and benthonic microfossils (particularly molluscs and foraminifera (, Azizbekov, 1972; Ali-Zade et al., 1986) and diatoms ( Ateava, pers. comm., 1994)). The work of Dzhabarova (1973) suggests that palynology may also be used to recognise the various stages (see notes below). In eastern Azerbaijan parts of the Diatom Suite are considered to have hydrocarbon source potential. Tarkhanian (Fig. 8) The Tarkhanian takes its name from a promontory in the Crimea (Likharev, 1958). The stratotype section yields Middle Miocene (NN5) calcareous nannoplankton (F. Rogl, pers. comm., 1994). Micwpalaeontology. Only non-age-diagnostic quasi-marine, smaller benthonic and rare planktonic foraminifera were recorded by Bogdanowicz (1950a) from the Tarkhanian of Kuban and later by Mamedova (1971) and Azizbekov (1972) from the Tarkhanian of Azerbaijan. These include Rotalia [Ammonia] ex gr. beccarii (smaller benthonic), which has a cosmopolitan distribution and probably ranges no older than Middle Miocene (RWJ's unpublished observations), and Nonion [Florilus] boueamim (smaller benthonic) and Globigerinci tarchanensis (planktonic), both of which have also been recorded in the Badenian of Central Paratethys (Papp et ciL. 1978; Papp&Schmid, 1985). Chokrakian (Fig. 9) The Chokrakian takes its name from a lake in the Crimea (Likharev, 1958). It is of Middle Miocene age on regional evidence (see above). Direct biostratigraphic evidence is lacking. The 'Vindobonian Marls" of Northern Iran appear correlative (Stocklin & Setudehnia, 1971, 1972). Micwpalaeontology. Only non-age-diagnostic, quasi-marine, smaller benthonic foraminifera were recorded by Bogdanowicz (1950b) from the Chokrakian of the western Precaucasus and later by Mamedo
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