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he paper presents results of organic petrography and Rock-Eval pyrolysis studies of Carboniferous rocks from Western Pomerania (N Poland). Samples for the studies were taken from core of the DŸwirzyno 3 borehole. The thermal maturity level of organic matter is determined by the values of: 1) vitrinite reflectance VRo= 0.82–0.93% and 2) Tmax= 431–460°C, which indicate oil window maturity. Organic petrography...