The First Records of the Order Acrotretida Kuhn in the Frasnian (Upper Devonian) Sediments of the Komi Republic

The First Records of the Order Acrotretida Kuhn in the Frasnian (Upper Devonian) Sediments of the Komi Republic

The structure and microstructure of the shell matrix of Acrotretella sp. is studied in protegulum (embryonic shells), brephic (juvenile shells), and adult shells. The structure of the secondary layer, represented by interlayers with columnar and spherulitic structures. Wrinkles developed along the s...

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Veröffentlicht in:Paleontological journal 2023-04, Vol.57 (2), p.184-186
Hauptverfasser: Smirnova, T. N., Zhegallo, E. A.
Format: Artikel
Sprache:eng
Schlagworte:
Acrotretida
Columnar structure
Devonian
Earth and Environmental Science
Earth Sciences
Interlayers
Juveniles
Microstructure
New records
Paleontology
Sediments
Sediments (Geology)
Shells
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Zusammenfassung:The structure and microstructure of the shell matrix of Acrotretella sp. is studied in protegulum (embryonic shells), brephic (juvenile shells), and adult shells. The structure of the secondary layer, represented by interlayers with columnar and spherulitic structures. Wrinkles developed along the shell margins.
ISSN:0031-0301
1555-6174
DOI:10.1134/S0031030123020132