Abstract
The Devonian reef formation in the Caspian Basin framing is related to two different formations. The Middle Devonian reefs are confined to an autochthonous terrigenous‒carbonate sequence of the Eifelian–lower Frasnian interval marked by the appearance of isolated domal reefs. The middle–upper Frasnian reefs are related to the carbonate formation and represented by two types: (i) asymmetric reefs on walls of the deep-water bays opening toward the Caspian microcean-bay; and (ii) solitary, relatively symmetric (in transverse section) reefs within these bays. The reef formation was characterized by prominent cyclic pattern. The framework reef formation ended before the terminal Frasnian, i.e., before the Kellwasser Event, with which the biotic crisis and faunal mass extinction was related.
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Original Russian Text © V.G. Kuznetsov, L.M. Zhuravleva, 2018, published in Litologiya i Poleznye Iskopaemye, 2018, No. 5, pp. 432–443.
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Kuznetsov, V.G., Zhuravleva, L.M. Devonian Reef Formation in the Caspian Basin Framing. Lithol Miner Resour 53, 394–403 (2018). https://doi.org/10.1134/S0024490218050061
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DOI: https://doi.org/10.1134/S0024490218050061