The rockforming rests of Cyanophyta in Oligocene of Ukrainian Carpathians are established. Hormogoniophyceae occupied the terrigenous and volcanigenous sediments, from Hormogoniophyceae Oscillatoriaceae formed the siliceous cyanobacterial mats. The organism’s development and type of organogenic rocks were determined by ground fluids composition.

Keywords: Carpathians, Oligocene, Hormogoniophyceae, Oscillatoriaceae, cyanobacterial mats, ground fluids

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