Abstract
The shell microstructure and its postmortem alteration were studied for two Early–Middle Cambrian paterinid families constituting the order Paterinida. The paterinid shells during life were organophosphate; most of the shell substance was organic. The organic matter after the death played an important role in the processes of postmortem alteration of the original microstructure. The conditions near the sea bottom also strongly influenced the type of preservation of paterinid shells.
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ACKNOWLEDGMENTS
The author is sincerely grateful to I.V. Korovnikov (Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences (IPGG SB RAS), Novosibirsk) for placing at my disposal samples with remains of Aldanotreta from the sections of lowermost Cambrian on the Aldan River and paterinids from the Cambrian of the Siberian Platform collected by Yu.L. Pelman, employers of PIN RAS E.A. Zhegallo and R.A. Rakitov for a constant help with SEM, and professor of the Department of Mineralogy, Faculty of Geology, Moscow State University E.M. Spiridonov for consultations on minerogenesis.
The brachiopods studied of the order Paterinida were collected in different years on the Siberian Platform by Yu.L. Pelman, I.V. Korovnikov (IPGG SB RAS), R.O. Galabala (All-Union Aerogeological Trust), A.Yu. Zhuravlev, Ya.E. Malakhovskaya, A.Yu. Ivantsov and the author (PIN RAS) and brachiopods from the Lower Cambrian of Mongolia were collected by E.A. Zhegallo, A.Yu. Zhuravlev and the author in the 1980s. All figured specimens are housed at the Borissiak Paleontological Institute of the Russian Academy of Sciences (PIN), Moscow, Siberian coll. no. 5486 and Mongolian coll. no. 3302.
Funding
This work was supported by the Russian Foundation for Basic Research, project no. 19-04-01027, Presidium of the Russian Academy of Sciences, program no. 17 “Evolution of the organic world. Role and impact of the planetary processes” (subprogram no. 1 “The development of life biosphere processes”) and Ministry of Science and Higher Education (Russia).
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Ushatinskaya, G.T. The Shell Microstructure of the Earliest Paterinids (Brachiopoda) and Its Postmortem Alteration. Paleontol. J. 54, 487–500 (2020). https://doi.org/10.1134/S0031030120050147
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DOI: https://doi.org/10.1134/S0031030120050147