Triactis triactis ( Ehrenberg, 1873 )

Popova, Irina M., Baumgartner, Peter O., Guex, Jean, Tochilina, Svetlana V. & Glezer, Zoya I., 2002, Radiolarian biostratigraphy of Paleogene deposits of the Russian Platform (Voronesh Anticline), Geodiversitas 24 (1), pp. 7-59 : 50-51

Triactis triactis ( Ehrenberg, 1873) ( Fig. 8A )

Haliomma triactis Ehrenberg, 1873: 236 ; 1875: pl. 28, fig. 4. — Petrushevskaya & Kozlova 1972: 523, pl. 13, fig. 2.

Staurolonche pachyxyphos – Clark & Campbell 1945: 15, pl. 1, fig. 22.

Heliodiscus triactis – Kozlova 1990: pl. XI, fig. 5. Triactis triactis – Kozlova 1999: pl. 28, fig. 8; pl. 29, fig. 5.

GEOGRAPHIC DISTRIBUTION. — Barbados, California, Atlantic Ocean, tropical zone, Voronesh Anticline.

STRATIGRAPHIC RANGE. — Middle Eocene ( Petrushevskaya & Kozlova 1972; Clark & Campbell 1945; Blueford 1988; Kozlova 1999; this study).

Figures

FIG. 8. — Early Eocene (3, 5-7, 9, 11-15) and middle-late Eocene (1, 2, 4, 8) Radiolarian association, Petropavlovka Village, Well 730, interval 44.3 m; A, Triactis triactis (Ehrenberg, 1873); B, D, Thecosphaera rotunda Borisenko, 1960; C, Heterosestrum formosum trispinum (Tochilina, 1972) emend.; E, I, Lithocyclia sp.; F, G, Periphaena heliasteriscus (Clark & Campbell, 1942); H, Stylodictya targaeformis (Clark & Campbell, 1942); J, Velicucullus sp. aff. oddgurneri Bjørklund, 1976; K, O(?), Spiromultitunica sp. aff. Prunopyle hayesi Chen, 1975; L, M, Spongoprunum (?) probus (Rüst, 1888); N, Hexacontium (?) sp. Scale bars: 100 µm.