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 : 43

Periphaena sp. aff. Heliodiscus hexasteriscus Clark & Campbell, 1942 ( Fig. 15A )

Heliodiscus hexasteriscus Clark & Campbell, 1942: 40 , pl. 3, figs 14, 15. — Kozlova 1990: pl. XI, fig. 3.

GEOGRAPHIC DISTRIBUTION. — California, Voronesh

Anticline. STRATIGRAPHIC RANGE. — Middle Eocene ( Clark &

Campbell 1942; Blueford & White 1984; Kozlova 1994); middle to late Eocene (this study).

REMARKS

The spines are without facets.

Figures

FIG. 15. — Middle-early late Eocene Radiolarian association, Sergeevka Village, outcrop 1, interval 14.3-15.5 m; A, Periphaena sp. aff. Heliodiscus hexasteriscus Clark & Campbell, 1942; B, Petalospyris sp.; C, D, Thecosphaera sp. A; E, Phacodiscinus (?) sp.; F, G, Actinommura sp. B; H, Lophocyrtis ex. gr. Theocyrtis andriashevi (Petrushevskaya, 1979); I, Lithomelissa spongiosa Bütschli, 1882; J, K, Ceratocyrtis sp. aff. Helotholus amplus Popofsky, 1908 or Tripodiscinus (?) sp.; L, Phormocyrtis sp. aff. ligulata Clark & Campbell; M, Thecosphaera sp. B; N, Lophocyrtis aspera (Ehrenberg, 1873); O, P, Periphaena heliasteriscus (Clark & Campbell, 1942). Scale bars: 100 µm.