RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 7, ES6003, doi:10.2205/2005ES000183, 2005

Plate 1. Fig. 1. General view of
silty deposit and microfossil depositions in the carbon-bearing
cement. Slide 120/3. Fig. 2. Bavlinella div. sp. in the
carbon-bearing cement of siltstone. Slide 120/3-1/3. Figs. 3, 4,
5. Octoedryxium div. sp. in the carbon-bearing cement of
siltstone. 3 - Slide 120/3-1/6; 4 - Slide 120/3-1/1; 5 - Slide
119/3-1/1. Figs. 6-10. Octoedryxium truncatum Rudavskaja.
6 - Slide 119/3-6; 7 - Slide 119/3-3/3; 8 - Preparation
119/3-3/39; 9 - Preparation 119/3-3/13; 10 - Preparation
119/3-3/27a. Figs. 11, 12, 16, 17. Octoedryxium div. sp.
11 - Macerate 119/3-L15 (SEM); 12 - Preparation 120/3-a8;
16 - Macerate 119/3-L17 (SEM); 17 - Preparation 119/3-3/23.
Fig. 13. Centrum sp. (ad lib. Octoedryxium sp.). Preparation
120/3-a3. Figs. 14, 15, 19. Octoedryxium aff. neftelenicum
Rudavskaja. 14 - Preparation 119/3-3/39; 15 - Macerate 119/3-L05
(SEM); 19 - Macerate 119/3-L19 (SEM). Fig. 18. Centrum aff.
quadratum Stanevich. Preparation 120/3-a4. Figs. 20,
38. Protosphaeridium (?) div. sp. 20 - Macerate 119/3-L18 (SEM);
38 - Macerate 130/6-P12, P13 (SEM). Plant detritus with coccoid
forms (saprophytic bacteria). Fig. 21. Bavlinella cf.
variabilis (Moorman) Stanevich. Preparation 119/3-3/5.
Figs. 22-24. Bavlinella div. sp. 22 - Preparation
119/3-3/22, accretion of forms; 23 - Macerate 119/3-L09 (SEM);
24 - Macerate 119/3-L08 (SEM). Fig. 25. Margominuscula
rugosa Naumova, emend. Jankauskas. Preparation 120/3-a2.
Fig. 26. Fragment of plant tissue. Preparation 119/3-2/13.
Fig. 27. Bavlinella sp. (ad lib. Micrhystridium sp.).
Preparation 119/3-2/19. Fig. 28. Leiosphaeridia holtedahlii
(Timofejev) emend. Jankauskas. Slide 119/3-1/19. Figs. 29, 36, 37,
40. Leiosphaeridia div. sp. 29 - Macerate 130/6-L01, L02
(SEM), a - general view, b - fragment with traces of pyrite (?)
crystals' piercing; 36 - Preparation 130/6-2/3; 37 - Preparation
130/6-4/2; 40 - Macerate 130/6-L05 (SEM).
Fig. 30. Leiosphaeridia minutissima (Naumova) emend. Jankauskas.
Preparation 130/6-4/15. Fig. 31. Pterospermopsimorpha
insolita Timofejev, emend. Mikhailova. Preparation 130/6-2/13.
Fig. 32. Plicatidium cf. latum Jankauskas. Slide 130/8-2/3.
Fig. 33. Leiosphaeridia laminarita (Timofejev) emend.
Jankauskas. Preparation 130/6-2/5. Fig. 34. Leiosphaeridia
aff. kulgunica Jankauskas. Slide 130/8-1/1; a transfixing quartz
grain (60
m m) in the center. Fig. 35. Leiosphaeridia
jacutica (Timofejev) Mikhailova et Jankauskas. Slide 130/8-3n,
crossed nicols; the form in a carbonaceous quartz-feldspar cement
of siltstone. Fig. 39. Tubulose forms (red algae?) in the
organogenic disintegrated matrix. Macerate 130/6-P04, P05 (SEM).
The material is deposited in the Institute of the Earth's Crust,
Siberian Division, Russian Academy of Sciences, in Irkutsk.
Locality: East Siberia, Sayany zone, Biryusa River, Late Riphean,
Ipsit Formation. Sources of illustrations: biological preparations,
petrographic slides, scanning electron microscopes (SEM).
Scale bars: single - 10
m m, twofold - 100
m m.

Citation: Stanevich, A. M., V. K. Nemerov, Yu. K. Sovetov, E. N. Chatta, A. M. Mazukabzov, V. I. Perelyaev, and T. A. Kornilova (2005), Precambrian microfossil-characterized biotopes from the southern margin of the Siberian craton, Russ. J. Earth Sci., 7, ES6003, doi:10.2205/2005ES000183.
Copyright 2005 by the Russian Journal of Earth Sciences
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