Phormocyrtis 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 : 46

Phormocyrtis sp. aff. proxima Clark & Campbell, 1942 ( Figs 9A, B, F, G ; 13N )

Phormocyrtis proxima Clark & Campbell, 1942: 82 , pl. 7, figs 24, 26. — Kozlova 1999: pl. 18, fig. 22 (21 is a misprint).

Podocyrtis turgida – Kozlova 1999, pl. 15, fig. 7.

Cryptocarpium phyzella – Kozlova 1999: pl. 26, fig. 12. GEOGRAPHIC DISTRIBUTION. —Of Phormocyrtis sp. aff. proxima : Western Siberia, North Caspian Sea lowland, Tyrgai, Voronesh Anticline.

STRATIGRAPHIC RANGE. — Early to middle Eocene ( Kozlova 1999); (?)late Paleocene-early Eocene (this study).

REMARKS

The shape of the shells observed is different from P. proxima holotype.

Figures

FIG. 9. — Early Eocene Radiolarian association, Petropavlovka Village, Well 730-C, interval 44.3 m; A, B, F, G, Phormocyrtis sp. aff. proxima Clark & Campbell, 1942; C, D, Pterocodon ampla longispina (Clark & Campbell, 1942) n. comb.; E, Lithostrobus picus (Ehrenberg, 1875); H, Pterocodon ex. gr. ampla (Brandt, 1936); I, J, Pterocodon ampla (Brandt, 1936); K, L(?), Petalospyris tumidula Kozlova, 1966; M, N, Phormocyrtis sp.; O, P, Rhopalocanium pyramis (Haeckel, 1887); Q, Rhopalocanium satelles (Kozlova, 1966); R-T, Dictyoprora urceolus Haeckel, 1887; U, V, Petalospyris sp. aff. septenaria Kozlova, 1966; W, Lychnocanoma cf. bellum Clark & Campbell; X, Y, Mita cf. regina (Campbell & Clark, 1944). Scale bars: 100 µm.

FIG. 13. — Middle Eocene Radiolarian association, Pirogovo Village, Well 510C, interval 44.0 m; A, F, Lophocyrtis aspera (Ehrenberg, 1873); B, O, Calocyclas talwanii Bjørklund & Kellogg, 1972; C, D, Anthocyrtidium pupa Clark & Campbell, 1942; E, I, L, Calocycletta sp. aff. virginis Haeckel, 1887; G, H, Lophocyrtis norvegiensis (Bjørklund & Kellogg, 1972); J, K, Lophocyrtis auriculaleporis (Clark & Campbell, 1942); M, Lophocyrtis sinitzini (Lipman, 1949) sensu Kozlova 1999; N, Phormocyrtis sp. aff. proxima Clark & Campbell, 1942. Scale bars: A-H, J-N, 100 mm; I, O, 50 µm.