TY - JOUR AU - V. Stefanskyy PY - 2014/12/17 Y2 - 2024/03/28 TI - The Upper Eocene oncolitic bioherms of Rybalsky quarry (Dnepropetrovsk) as indicator facies Mandrikovka beds JF - Journal of Geology, Geography and Geoecology JA - JGGG VL - 22 IS - 3/2 SE - DO - https://doi.org/10.15421/111414 UR - https://geology-dnu.dp.ua/index.php/GG/article/view/92 AB - This is the first description of oncolites and theirs bioherms from Mandrikovka layers (Rybalskiy quarry, Dnepropetrovsk). In the Mandrykovka layers of Rybalsky career Dnepropetrovsk there are numerous remains of cyanobacterial paleocoenosis (oncolites fossil covers bacteria, fossilized microbial mat). Nodule oncolites here are rock-forming and greatly affect the lithological composition Mandrykovka rocks, sometimes exceeding half he total and forming bioherms. But as currently paleobaktery taxonomy is still under development, the presence of residues nannoorganizmes in the Mandrykovka layers (fossils and fossilized bacteria covers cyanobacterial mats) does not allow us to draw any stratigraphic conclusions. The Mandrykovka layers formed in the littoral environment, characterized by a unique set of paleontological and locally common in the southern part of the Dnipropetrovsk city. At present the Mandrykovka layers are not adequately investigated and require complex additional exploration.Keywords: stratigraphy, paleontology, facies, Upper Eocene, Middle  Dnieper area.  ER -