. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. FIGURE 8. Characteristic silicoflagellate complex of the Late Eocene of the eastern slope of the Santonian-Campanian: 1—Dictyocha frenguellii Defl. var. frenguellii; 2, 3—D. f. var. carentis Gleser f. carentis; 4, 6 — D. f. var. carentis f. incerta Gleser; 5— D. deflandrei var. completa Gleser f. com plet a; 7 —N a viculopsis b ia picu lat a (Lemm.) Freng. var. bia piculata; 8—N. b. var. m i nor (Schulz) Gleser; 9 —Dictyocha fibula Ehr. var. fibula f. fibula; 10 —D. triacantha Ehr. var. triacantha f. triacantha; 11, 12
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. FIGURE 8. Characteristic silicoflagellate complex of the Late Eocene of the eastern slope of the Santonian-Campanian: 1—Dictyocha frenguellii Defl. var. frenguellii; 2, 3—D. f. var. carentis Gleser f. carentis; 4, 6 — D. f. var. carentis f. incerta Gleser; 5— D. deflandrei var. completa Gleser f. com plet a; 7 —N a viculopsis b ia picu lat a (Lemm.) Freng. var. bia piculata; 8—N. b. var. m i nor (Schulz) Gleser; 9 —Dictyocha fibula Ehr. var. fibula f. fibula; 10 —D. triacantha Ehr. var. triacantha f. triacantha; 11, 12 — D. rotundata Jouse var. rotundata. 181 For comparison, the Late Eocene flora of the Turgai Gates (Tumalykol' village; Uzen'-Kairakty River) was examined. The Late Eocene flora of Tumalykol' village is comparatively poor (Table 54). It consists of 8 species belonging to the family Dictyochaceae Lemm. Most of these species (5) belong to the genus Dictyocha Ehr.; Distephanus Stohr, Naviculopsis Freng. and Mesocena Ehr. emend. Defl. are represented by one species each. The only characteristic elements of the Middle — Late Eocene of the West Siberian plain and the eastern slope of the Urals present here are Dictyocha rotundata Jouse var. rotundata and Naviculopsis biapiculata var. minor (Schulz) Gleser, which play a minor role in the complex. Dominant here are Distephanus antiquus Gleser and 2 forms of Dictyocha elata Gleser, which are unknown from the Late Eocene of Western Siberia. We have encountered such a flora only in the northern part of the West Siberian plain. The complex of Tumalykol' village will be discussed later in the description of the Early (?) Oligocene silicoflagellates of the West Siberian plain. The Late Eocene flora of Uzen'-Kairakty River, a right tributary of the Irgiz River, has a quite different nature. Here were determined 19 species, varieties and forms belonging to 4 silicoflagellate genera (Dictyocha 194. Please note that these ima
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