The materials, collected during the description of 17 outcrops of Karatlykh formation (Lower Valanginian) and Karaghach formation (Lower Hauterivian) in the Bodrak River middle course (South-Western Crimea), are analyzed. The results of microscopic descriptions of thin sections, computed micro-tomography of samples, carbonate content detection, and particle-size analysis of insoluble residue are presented, the remains of scleractinian corals and cartilaginous fish are studied. Descriptions and sedimentological interpretation of 8 lithological-genetic types of layers are also presented in this article. During Karatlykh time and regressive phases of Karaghach time, terrigenous sedimentation prevailed. From the coast to the center of the basin there were pebble-sandy beaches, sandy ripples, detrital ripples with sandy depressions, detrital ripples of the far part of the shallow-water shelf. During transgressive phases of the Karaghach time, there was a shortage of terrigenous sedimentary material and carbonate s