Abstract
Preliminary results of the studies on 12 samples from Dobrostan Formation along three profiles in Northern and Southern Pirin Mountain, as well as on one sample from the stratotype of the Formation in the Central Rhodope Mountains, revealed different amounts of organic matter. The latter consists of organic coats, plant detritus, graphite crystals and kerogene matter, and contains also specimens of microphytofossils in differing state of preservation. The following taxa have been determined: Protosphaeridium sp., Protosplweridium den sum Tim., Kildinella sp., Kildinella cf. sinica Tim., Kildinella cf. hyperboreica Tim., and Trachysphearidium (?) sp. These microphytofossils are characteristic for the Upper Proterozoic (Riphean). The presence of the genus Kildinella – a guide fossil for the Riphean of Eurasia, confirms the Riphean age of Dobrostan Formation in Pirin Mountain, i.e. the same age already establi shed for this Formation in its type region.
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