Ommatogramma biconstrictus ( Lipman, 1953 )

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

Ommatogramma biconstrictus ( Lipman, 1953) ( Figs 7S ; 10N )

? Spongurus biconstrictus Lipman, 1953 : tabl. 7, fig. 5. — Gorbunov 1979: 113, pl. 10, fig. 3. — Blueford & Amon 1993: 80, pl. 6, figs 3, 5-8.

Ommatogramma biconstrictus – Petrushevskaya & Kozlova 1979: 109, figs 510-514.

Amphicarydiscus biconstrictus – Kozlova 1999: 97, pl. 42, figs 7, 8.

GEOGRAPHIC DISTRIBUTION. — Turkmenistan, Norwegian Sea, Russian Platform, western Siberia.

STRATIGRAPHIC RANGE. — Eocene, Kizil-Kum ( Lipman 1953); Plato VØring ( Petrushevskaya & Kozlova 1979); Western Siberia ( Blueford & Amon 1993); (?)late Paleocene-early Eocene (this study).

Figures

FIG. 7. — Early Eocene Radiolarian association, Petropavlovka Village, well 730, interval 44,3 m; A, B, Petalospyris sp. aff. argiscus Ehrenberg,1875; C, D, Petalospyris (?) sp.;E, F, Pterocodon ampla (Brandt,1936); G, Lychnocanoma bellum longipes (Kozlova,1966); H, Podocyrtis cf. papalis Ehrenberg, 1875; I, Lychnocanoma sp. aff. bandyca Mato & Theyer, 1980; J, Cycladophora cf. Pterocorys bicornis Popofsky, 1908; K, Lithostrobus picus (Ehrenberg,1875); L, Amphisphaera megaxyphos trixyphos (Clark & Campbell, 1942); M, Amphymenium splendiarmatum Clark & Campbell, 1942; N, Clathrocyclas ex. gr. universa Clark & Campbell, 1942; O, Prunopyle sp. aff. ovata Kozlova, 1966; P, Plectodiscus circularis (Clark & Campbell, 1942); Q, Petalospyris argiscus Ehrenberg, 1875; R, Anthocyrtidium sp. aff.pupa Clark & Campbell, 1942;S, Ommatogramma biconstrictus (Lipman,1953).Scale bars:100 µm.

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.