Abstract
The shell structure of five rhynchonellid species from the Lower Cretaceous of Dagestan was studied for the first time. The primary layer is rarely preserved in fossil rhynchonellids. Most of the species studied have a primary layer composed of prismatic calcite, one species has a finely granulated primary layer. The secondary fibrous layer consists of crossing bundles of fibers the (throughout shell thickness) and parallel bundles of fibers on the valve bottom.
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References
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Original Russian Text © T.N. Smirnova, Chen Xingyui, 2010, published in Paleontologicheskii Zhurnal, 2010, No. 4, pp. 35–37.
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Smirnova, T.N., Chen, X. Shell structure of the Early Cretaceous (Berriasian-Barremian) Rhynchonellids from Dagestan. Paleontol. J. 44, 395–398 (2010). https://doi.org/10.1134/S0031030110040052
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DOI: https://doi.org/10.1134/S0031030110040052