Geological structure of the Ubinka River valley (Northwestern Caucasus) |
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| Authors: | A V Marinin L Ph Kopaevich S I Stupin |
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| Institution: | 1.Schmidt Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia;2.Regional Geology and Earth History Department, Faculty of Geology,Moscow State University,Moscow,Russia;3.Institute of Geology,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | A thick olistostrome strata of late Paleocene-early Eocene age is outlined in the northern flank of the Northwestern Caucasus
folded structure in the Ubinka river valley, which shows the significant role of earlier Cenozoic tectonic movements in forming
the alpine structure of the region. The largest part of the strata is composed of dark weakly calcareous clays, which were
earlier recognized as Lower Cretaceous deposits. Olistoliths and large olistoplaques are mostly of light calcareous rocks
in which microfauna of Cenomanian and Maastrichtian ages were discovered in dark clays. A poor series of foraminifers was
recognized in the dark clays hosting these olistoliths; this series do not enable one to determine with certainty the age
of the strata (of approximately the late Paleocene-early Eocene). Small structural forms were recognized in olistoliths and
olistoplaques, which are not traced in the matrix, this indicates that a series of folded and fissured structures were formed
before these olistoliths and olistoplaques appeared in the olistostrome strata. |
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