Radiolarian biostratigraphy of Paleogene deposits of the Russian Platform (Voronesh Anticline) Author Popova, Irina M. Institute of Geology and Paleontology, University of Lausanne, BFSH- 2 (Switzerland) Irina. Popova @ igp. unil. ch Centro di Studio di Geologia dell’Appennino e delle catene Perimediterranee, via la Pira 4, Firenze (Italy) opova@igp.unil.ch Author Baumgartner, Peter O. Institute of Geology and Paleontology, University of Lausanne, BFSH- 2 (Switzerland) Peter. Baumgartner @ igp. unil. ch aumgartner@igp.unil.ch Author Guex, Jean Institute of Geology and Paleontology, University of Lausanne, BFSH- 2 (Switzerland) Jean. Guex @ igp. unil. ch uex@igp.unil.ch Author Tochilina, Svetlana V. Pacific Oceanological Institute, Vladivostok (Russia) Author Glezer, Zoya I. Union Geological Institute (VSEGEI), Sredny pr. 74, Saint-Petersburg (Russia) text Geodiversitas 2002 24 1 7 59 journal article 10.5281/zenodo.5375608 1638-9395 5375608 Thecosphaera magnaporulosa ( Clark & Campbell, 1942 ) ( Fig. 14C, D ) Carposphaera magnaporulosa Clark & Campbell, 1942: 21 , pl. 5, figs 15, 17, 21, 23. GEOGRAPHIC DISTRIBUTION. — California , North Caspian Sea lowland, Russian Platform, southern part. STRATIGRAPHIC RANGE. — Middle Eocene ( Clark & Campbell 1942 , 1944; Blueford & White 1984 ; Blueford 1988 ; Khokhlova 1996 ); middle to late Eocene (this study).