Abstract
New data on the stratigraphy and faunal assemblages of the Lower Silurian of the Chingiz region are presented. Owing to the discovery of Ruddanian brachiopods in the basal Alpeis Formation, the position of the Ordovician-Silurian boundary has been revised. The stratigraphic range of the Alpeis Formation has been revised to correspond to the range of the Alpeis Horizon in the stratotype and is limited to the beds with the brachiopod Eospirifer cinghizicus and the beds with the graptolites of the Coronograptus gregarius Zone. Beds with Pentamerus longiseptatus of the Donenzhal Horizon are assigned to the Zhumak Formation. A new Ruddanian brachiopod assemblage (ten species) is recognized in the lower part of the beds with E. cinghizicus.
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Original Russian Text © O.I. Nikitina, I.F. Nikitin, M.A. Olenicheva, L.M. Palets, 2015, published in Stratigrafiya. Geologicheskaya Korrelyatsiya, 2015, Vol. 23, No. 3, pp. 30–49.
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Nikitina, O.I., Nikitin, I.F., Olenicheva, M.A. et al. Lower Silurian stratigraphy and brachiopods of the Chingiz range, eastern Kazakhstan. Stratigr. Geol. Correl. 23, 262–280 (2015). https://doi.org/10.1134/S0869593815030065
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DOI: https://doi.org/10.1134/S0869593815030065