Abstract. A rich association of primary guano minerals, including taranakite, hydroxylapatite, brushite and gypsum with relicts illite, kaolinite, alpha (low) quartz calcite, was identified in the fossil bat deposit from Gura Dobrogei Cave, Dobrogea County, Romania. Gypsum Ca phosphates developed preferentially on carbonate bedrock or fallen blocks mass, whereas taranakite clay-rich, detritic s...