Conglomerates and Sandstones of the Demerdji Formation assigned to the Upper Jurassic comprise the third major stratigraphic sequence of the Crimean peninsula (southeast Europe, Black Sea coast). The basement of the Crimean sedimentary sequence consists of highly metamorphized rocks assigned to Precambrian and/or Paleozoic erathems. The second structural floor consists of folded sandstones and shales of Tavrick and Eksiordian Formations. The conglomerate contains exotic clasts with the probable source area located in the Ukrainian Crystalline Massif, up to 400 km to the north. This formation has numerous features that demonstrate its formation in a vigorous hydraulic regime. Hydraulic parameters derived from grain analysis suggest ranges of hydraulic conditions during the Flood, and erosion of the underlying flysch indicates a strong variation of hydraulic conditions during the main phase of the Flood. To the extent that these Crimean formations are typical of other geosynclinal settings, they can be used to interpret sedimentary sequences in other fold belts