Spongodiscus, Ehrenberg, 1854

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 : 48

Spongodiscus ex. gr. cruciferus ( Clark & Campbell, 1942) ( Fig. 17M, S )

Spongasteriscus cruciferus Clark & Campbell, 1942: 50 , pl. 1, figs 1-6, 8, 10, 11, 16-18. — Kozlova 1984: pl. X, fig. 16. — Blueford & White 1984: pl. 3, fig. 12. — Blueford 1988: 252, pl. 6, figs 7, 8. — Blueford & Amon 1993: 78, pl. 1, fig. 8, pl. 3, fig. 2.

Spongodiscus cruciferus – Sanfilippo & Riedel 1973: 50, pl. 11, figs 14-17, pl. 28, figs 10, 11.

Amphicarydiscus fusoideus – Lipman 1984: pl. XIV, fig. 10.

Amphibrachium paleogenicum – Gorbunov 1979: 130, pl. 7, fig. 2, pl. 9, figs 1a-3.

GEOGRAPHIC DISTRIBUTION. — Of S. cruciferus : California, Gulf of Mexico, Russian Platform, southern part.

STRATIGRAPHIC RANGE. — Middle to latest Eocene ( Clark & Campbell 1942; Sanfilippo & Riedel 1973; Blueford & White 1984; Blueford 1988; Gorbunov 1979); (?)late Paleocene-early Eocene (this study).

Figures

FIG. 17. — Early and middle-late Eocene Radiolarians from different localities; A, Druppatractus polycentrus Clark & Campbell, 1942, o/p 294/4, interval 6.3 m; B, Ellipsostylus anisoxyphos Clark & Campbell, 1942, o/p 294/6, interval 8.3 m; C, Hexacontium pachydermum Jørgensen, 1900, well 510C, interval 44.0 m; D, Heterosestrum formosum trispinum (Tochilina, 1972) emend., well 730C, interval 43.7 m; E, Lithomelissa sp. aff. ehrenbergi Bütschli, 1882, well 510C, interval 40.0 m; F, Euscenarium (?) sp., well 730C, interval 44.3 m; G, Theocorys anapographa Riedel & Sanfilippo, 1970, o/p 294/3, interval 5.3 m; H, Periphaena decora Ehrenberg, 1873, well 730C, interval 43.7 m; I, J, Periphaena pentasteriscus (Clark & Campbell, 1942), well 510C, interval 40.0 m; K, Tripocyrtis (?) sp., o/p 294/11, interval 12.8 m; L, Porodiscus charlestonensis Clark & Campbell, 1945, well 510C, interval 44.0 m; M, S, Spongodiscus ex. gr. cruciferus (Clark & Campbell, 1942), well 730C, interval 43.7 m; N, Lithomelissa sp. aff. spongiosa Bütschli, 1882, o/p 294/4, interval 6.3 m; O, Ommatogramma sp. aff. biconstrictus (Lipman, 1953), well 730C, interval 38.8 m; P, Q, Peripyramis magnifica magnifica (Clark & Campbell, 1942), well 730C, interval 43.7 m; R, Prunobrachium (?) sp., well 730C, interval 43.7 m. Scale bar: 100 µm.