TY JOUR TI Lithostratigraphy of the Lower Cretaceous of Southwestern and Central Crimea KW formations KW member KW sedimentary sequences KW correlation KW stratigraphic scheme KW Lower Cretaceous KW Crimea JO Russian Journal of Earth Sciences AU Dubkova, K.A. AU Shishlov, S.B. AU Kolbanova, A.V. PY 2025 IS 25 PB Geophysical Center of the Russian Academy of Sciences