Thecosphaera rotunda Borisenko, 1960

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 : 49

Thecosphaera rotunda Borisenko, 1960 ( Fig. 8B, D )

Thecosphaera rotunda Borisenko, 1960: 222 , pl. 1, fig. 3, pl. 3, figs 2, 3. — Lipman 1984: pl. 14, fig. 4.

Thecosphaera melitomma Kozlova & Gorbovets, 1966: 52 , pl. 7, figs 7, 8.

Thecosphaerella rotunda Kozlova, 1999: 80 , pl. 7, figs 1, 2; pl. 11, figs 1, 2; pl. 27, figs 1, 4.

Thecosphaera sp. aff. larnacium – Kozlova 1999: pl. 33, fig. 2.

GEOGRAPHIC DISTRIBUTION. — Russian Platform, Western Siberia, Kazakhstan, Atlantic Ocean.

STRATIGRAPHIC RANGE. — Late Paleocene-middle Eocene ( Kozlova 1999); (?)late Paleocene-late Eocene (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.