Conotheca circumflexa Missarzhevsky
publication ID |
https://doi.org/ 10.4202/app.2012.0004 |
persistent identifier |
https://treatment.plazi.org/id/03C3891D-1534-C26A-FCC9-FF3BCBABFD44 |
treatment provided by |
Felipe |
scientific name |
Conotheca circumflexa Missarzhevsky |
status |
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Conotheca circumflexa Missarzhevsky in Rozanov et al., 1969
Fig. 27F View Fig .
Material.—One phosphatised conch, SMNH X 4629, from sample 7/55; Emyaksin Formation, Bol’shaya Kuonamka Riv- er; correlated with the Judomia Zone , upper Atdabanian Stage.
Description.—Conch helically curved about a half revolution clockwise towards the direction of growth. The aperture is straight and rounded, slightly oval. The surface of conch is covered with straight, faint, transverse lines. The apical angle is ca. 20°. Wall microstructure is similar to that of other hyoliths (see also Kouchinsky et al. 2009: fig. 45).
Stratigraphic and geographic range.—Lower Cambrian, Atdabanian Stage, Siberian Platform.
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