Textures of the layering surfaces in the Neogene sedimentary formation of the Precarpathian foredeep


  • M. D. Petrunjak Ukrainian Mineralogical Society; Ukraine, Lviv;
  • O. M. Cheremisska Insitute of Geology and Geochemistry of Combustible Minerals of NASU,
  • G. M. Petrunjak Lviv National University named after Ivan Franko,
  • Yu. V. Cheremissky Insitute of Geology and Geochemistry of Combustible Minerals of NASU,
Keywords: Precarpathian foredeep, paleoichnology, Neogene, Stebnik suite, Dobrotiv suite, problematic footprints.

Abstract

Article is concentrated on the unique preservation of vertebrates, plants and atmospheric phenomena textures on layering surfaces of Neogene sedimentary complex of the Precarpathian foredeep. Footprints and their volumetric reflections have represented the smallest details of objects sculptures and hydrodynamic regime of sedimentation basin. For obtaining the reliable results of reserching, stratigraphic correlation and reconstruction of paleooceanographic conditions of sedimentation in Neogene sedimentary basin, the authors applied such methods: formational, lithofacies, structural, paleogeographical, paleotectonical and paleoecological. Basing on the evidence data, lithologo-stratigraphic correlation was conducted for more than 80 complete outcrops of sedimentary rocks of Dobrotiv and Stebnyk suites of Neogene within Precarpathian foredeep. Established the periodicity in sedimentation process, reconstructed the conditions of formation, saving and disposal of biogenic and abiogenically textures. Reserches are conducted on the base of a detailed study of the most complete outcrops of Dobrotiv and Stebnyk suites in the basin of the river Prut and actually rock material, selected by authors in indigenous occurrence. Dobrotiv suite in the area of perycline fold’s closure of the Dobrotiv′s anticline, described in several stratigraphic sections. Correlation of obtained data indicates on facial stability of the layer with reflections of footprints on reaching (30-40 m) in the range of 1620 m, which is confined to the limit switch of Sloboda conglomerates in deposits Dobrotiv suite. The greatest accumulation of paleoihnological textures and traces of atmospheric phenomena on the surface of layers is controlled by red sandstone layer. Stebnyk suite is characterized by typical continental formation sign of redcolor layers, covered with thick layer of salt. It is represented by two lithological-facies complexes: Vyrva – clay-psammite (520-600 m) and Nadvirna – psammite-clay (570-660 m). During the fieldwork 2008-2016 years, the authors recorded a significant number of traces of footprints and their volumetric reflections (vertebrates, atmospheric phenomena, birds, gazelles, predators, reptiles, amphibians and other animals). Established pattern of their distribution and binding to distinct stratigraphic levels in sediments of Dobrotiv and Stebnyk suites. The absence of the new theoretical and practical information causes to classified a significant number of them in the category of problematic. On the surface layers of siltstone, sandstone, marl, clay recorded a numerous prints traces of vertebrates and rare texture of erosion, cracks of drying, ripples, reflections of ice crystals, relics of the root system of plants, channels selection of gas, isolated laying eggs of birds and caviar of amphibians. Survival of sculptural details of many rare traces of vertebrates is unique in Neogene sediments of Precarpathian foredeep, but in the process of preparing surfaces of the layering the authors established areas, which exposed to intense activity of organisms, atmospheric and hydrodynamic factors on the stage of sedimentogenesis. 

Author Biographies

M. D. Petrunjak, Ukrainian Mineralogical Society; Ukraine, Lviv;
Ukrainian Mineralogical Society; Ukraine, Lviv;
O. M. Cheremisska, Insitute of Geology and Geochemistry of Combustible Minerals of NASU,
Insitute of Geology and Geochemistry of Combustible Minerals of NASU, Senior Engineer інженер; Ukraine, LvivUkrainian
G. M. Petrunjak, Lviv National University named after Ivan Franko,
Lviv National University named after Ivan Franko, postgraduate; Ukraine,
Yu. V. Cheremissky, Insitute of Geology and Geochemistry of Combustible Minerals of NASU,
Insitute of Geology and Geochemistry of Combustible Minerals of NASU, Engineer 1st Category;

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Published
2016-12-28
How to Cite
Petrunjak, M., Cheremisska, O., Petrunjak, G., & Cheremissky, Y. (2016). Textures of the layering surfaces in the Neogene sedimentary formation of the Precarpathian foredeep. Journal of Geology, Geography and Geoecology, 24(2), 98-105. https://doi.org/https://doi.org/10.15421/111637