Results of drilling Holocene deposits on the spit of Yasensky Bay (2024)

During drilling of 17 boreholes in the coastal zone of the Yasensky Bay of the Sea of Azov, new data on the lithological composition and structure of the upper part of the sedimentary strata, as well as the thickness of the layers composing it, were obtained. The structure of low-ecological communities was analyzed and changes in the taxonomic composition of mollusks along the vertical of the studied geological sections on various accumulative forms were traced. It was established that the carbonate material of the coastal ridges consists of 90–95% fragments and, less often, whole valves of the Cerastoderma glaucum mollusk shells. Numerous valves of halophilic Black Sea species, including whole shells of Gastrana fragilis, were noted in the underlying sandy-shell deposits of the Yasenskaya Spit and the bay-bar of Lake Khanskoye. They are markers of the Ancient Azovian stage of the sea development. The surface relief of the Kamyshevatskaya Spit was studied in detail and three generations of coastal ridges of different ages were identified.