Fig. 4 in Volgian and Santonian-Campanian radiolarian events of the Russian Arctic and Pacific Rim

Fig. 4. Scanning electron micrographs of Late Jurassic radiolarians from siliceous clay rocks in northern Russia, Barents offshore. Sample 234, Middle Volgian (Dorsoplanites panderi Ammonite Zone) of the Pesha River Basin, borehole 234 (A–C, E–G, I–T). Sample G2, Late Volgian (Craspedites subditus Ammonite Zone) of the Uljanovsk Volga Basin, species from siliceous clay rocks in northern Russia, section Gorogische (D, H). A. Pentalastrum sp., GIN N 234−R−15. B. Praeconocaryomma hexagona (Rüst, 1898), GIN N 234−R10. C. Stylartus sp., GIN N 234−R12. D. Stichocapsa devorata arctica Vishnevskaya and Murchey, 2002, GIN N G−2−R1−3. E, F. Hagiastridae. E. GIN N 234−R11a. F. GIN N 234−R11b. G. Orbiculiforma? retuza (Kozlova, 1971), GIN N 234−R13. H. Spinicingula ceratina Kozlova and Vishnevskaya sp. nov., GIN N G−2−R1−5b. I. Praeparvicingula aff. sencilla Hull, 1995, GIN N 234−R21. J, M. Parvicingula cf. jonesi Pessagno, 1977. J. GIN N 234−R18b. M. GIN N 234−R18c. K. Parvicingula jonesi Pessagno, 1977, GIN N 234−R18a. L. Parvicingula blowi Pessagno, 1977, GIN N 234−R16. N. Parvicingula cf. grantensis Pessagno and Whalen, 1982, GIN N 234−R19b. O. Praeparvicingula holdsworthi (Yang, 1993), GIN N 234−R17. P. Parvicingula cf. obstinata Hull, 1995, GIN N 234−R23b. Q. Stichocapsa sp., GIN N 234−R27. R. Parvicingula rothwelli Pessago, 1977, GIN N 234−R24. S. Praeparvicingula rotunda Hull, 1995, GIN N 234−R25. T. Parvicingula alata Kozlova and Vishnevskaya sp. nov., GIN N 234−R1−2.