Biochronological marking and correlation of the boundaries of phanerozoic stratigraphic units

Research subject. The issues related to the task of correlating the boundaries of Phanerozoic stratigraphic units are discussed. The concepts of chronology, chronometry, zone, zonal method, stratigraphic boundary, marking of stratigraphic boundaries, establishing the chronological identity of stratigraphic boundaries are defined. Material and methods. Criteria for the reliable correlation of stratigraphic boundary division in remote-region sections are specified. Results. The boundary of adjacent stratigraphic divisions established using the zonal biochronological scale is a certain zone. This boundary is the corresponding (eponymous) stratozone in the section. The linear nature of the boundaries of geological objects, determined using the chronological scale, is recorded only on the zonal scale. Real (natural, material) boundaries of geological objects in the section are always volumetric. Conclusions. For the accurate comparison of stratigraphic boundaries, an elementary zonal biochronological scale comprising three zones is required. This scale serves as the primary tool for the identification and correlation of stratigraphic boundaries across all hierarchical levels of the Phanerozoic stratigraphic system. Boundaries of stratigraphic units located in distant sections are considered coeval (chronologically equivalent) provided that they occur within a specific, eponymous stratozone defined using a standard zonal biochronological scale for the corresponding stratigraphic interval.

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