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

Figure 2. Correlation of Late Precambrian geologic bodies in the Sayany-Baikal
fold system (SBFS). Microfossil localities and their ecobiological interpretation.
a - general chronological scale; b - regional horizons (series) of SBFS:
Md - Medvezhevka; Bl - Ballaganakh; Dl - Dal'netaiga; Zn - Zhuya;
Jd - Judoma. (1-6) microfossil ecobiological groups (explanations see below);
(7) conglomerates and breccia-conglomerates; (8) gravelstones and polymictic,
arkose-graywacke sandstones; (9) quartz sandstones; (10) siltstones;
(11) argillites, silty argillites; (12) carbon-bearing argillites and silty
argillites, sign of carbonaceous sediments; (13) limestones, sandy limestones,
interbedded limestones and silty argillites; (14) dolomites, sandy dolomites,
interbedded dolomites and silty argillites; (15) dolomitic limestones,
calcareous and silty argillitic dolomites; (16) marls; (17) carbonates
bearing stromatolites and microphytoliths; (18) granite, plagiogranite;
(19) acidic volcanic rocks; (20) intermediate volcanic rocks;
(21) basic volcanic rocks; (22) tuffs and tuffites;
(23) boundaries of regional horizons; (24) isotopic age:
743
47
(Sm-Nd isochron)
[Sklyarov et al., 2003];
670
65 (Rb-Sr isochron)
[Buldygerov et al., 1988];
663
3,
704
71,
812
19,
823
2,
825
3
(Sm-Nd isochron and U-Pb by zircon)
[Rytsk et al., 1999, 2001];
711
6,
727
18 (U-Pb by zircon)
[Rytsk et al., 2000].
Formations and sequences: ai - Aiktin; ain - Ayanka; ais - Aisa; an - Anangra;
as - Asektamur; au - Aunakit; avg - Avgol; avk - Avkit; bd - Bodaibokan;
bg - Bugarikhta; br - Barakun; bz - Buzhuikhta; cn - Chencha; cs - Chaya;
dg - Dogalda; dl - Delyun; dlg - Dzhalagun; dn - Dannaya;
dz - Dzhemkukan; gl - Goloustnaya; gr - Gramdakan; hl - Kholodnaya;
hm - Khomolkha; hr - Kharlukhtakh; ht - Khoty; hv - Khaiverga;
il - IligirŐ; im - Imnyakh; ip - Ipsit; it - Itykit; jk - Yakor;
jkr - Yakrin; jng - Yanguda; kc - Kachergat; kk - Kooktin;
kl - Kalancha; kln - Kelyana; kr - Kurtun; md - Medvezhevka;
mm - Mamakan; mr - Mariinskii; mrn - Marnin; ng - Nugan;
nh - Nokhtuisk; nk - Nikol'skoe; okt - Oktolokit; old - Oldakit;
on - Ondoko; pdr - Padrokan; prv - Protivodavan; pm - Pravomam;
rs - Rassokha; sd - Sidel'tin; shn - Shangulezh; sm - Shumnyi;
sn - Synnyr (Inyaptuk volcanic complex); st - Stoibishchnaya;
tg - Tagul; tk - Tukolamii; tn - Tinnaya; ts - Tyya; ud - Uda;
ug - Ugakhan; ul - Uluntuiskaya; ur - Urin; urh - Uryakh;
us - Usol'e; ush - Ushakovo; ust - Ust'tagul; uur - Ust'uryakh;
vc - Vacha; vd - Vodorazdel'naya; vl - Valyukhta; zl - Zolotoi;
zr - Zherba; pr - Primorskii granite complex.
Ecobiological groups (symbols 1-6): (1) anaerobic, sulfate-reducing,
and other (?) bacteria, marine benthos from different depths;
(2) aerobic sulfur bacteria, shallow marine benthos;
(3) dinoflagellates or aerobic prostecobacteria, facultative marine plankton;
(4) cyanobacterial, mainly littoral assemblages;
(5) acanthomorphic and other eucaryotic algae, mainly plankton;
(6) green algae, facultative marine plankton. Microfossil
species and genera referred to ecobiological groups are shown on
Figure 5.

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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