Periphaena sp.

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 : 41

Periphaena sp. aff. Heliodiscus inca ( Clark & Campbell, 1942) ( Fig. 10E )

Heliodiscus inca – Kozlova 1999: 84, pl. 17, fig. 14; pl. 21, fig. 8; pl. 24, figs 2, 4; pl. 40, fig. 9.

GEOGRAPHIC DISTRIBUTION. — California, Western Siberia, Ouzbekistan, eastern slope of the Ural mountains, Russian Platform.

STRATIGRAPHIC RANGE. — Middle to latest middle Eocene ( Clark & Campbell 1942, 1945); early-middle Eocene ( Kozlova 1999); (?)late Paleocene-early Eocene (this study).

REMARKS

The specimen is different from the holotype in the larger number of spines and in their round shape.

Figures

FIG. 10. — Early Eocene Radiolarian association, Petropavlovka Village, Well 730, interval 44.3 m; A, B, Periphaena perplexus (Clark & Campbell, 1942); C, F, J, Haliomma (?) faceta (Krasheninnikov, 1960); D, G, Heterosestrum formosum (Tochilina, 1970); E, Periphaena sp. aff. Heliodiscus inca (Clark & Campbell, 1942); H, K, Stylotrochus festivus Clark & Campbell, 1942; I, Heterosestrum (?) sp.; L, M, Amphicraspedium praemurrayanum Kozlova, 1999; N, Ommatogramma biconstrictus (Lipman, 1953). Scale bars: 100 µm.