Figure 4. Paleo-transect across the southern Yenisei-Cis-Sayan
foredeep and the Baikit uplift (transverse to the fold-and-thrust
belt), modified after [Sovetov et al., 1996]. In
late Aleshino time, various stratigraphic horizons of the molasse
assemblage started onlapping basement and overlapping the
foredeep. Assemblage facies change in the same direction, away
from the principal (western) source of material, as the marine
basin advances from the north. Reference shallow marine systems
correspond to the Chistyakovo-late Vanavara marine transgression.
The second major marine transgression (Redkolesnaya) was coeval to
an orogenic pulse and to the pre-Oskobinsky break forming on a
forebulge (Baikit anteclise). The third marine transgression,
predating the pre-Katanga break, terminated in the deposition of a
continuous carbonate and carbonate-sulfate cover.
Symbols: 1 - Riphean folded basement. Taseyeva
Group. Lower fluvial assemblage, sedimentary systems of
(2) braided gravel dominated stream, (3) meandering sand dominated
stream and ephemeral branching channels, (4) wandering,
meandering, and braided gravel dominated streams, pelite-sand
terrestrial delta, and ephemeral (proluvial) streams on the Baikit
uplift. (5) Medium- and shallow marine assemblage, sedimentary
systems of foreshore and transitional beach zones and distal inner
shelf zone. The Upper fluvial assemblage, sedimentary systems of
(6) anastomosing pelite-sand dominated stream, (7) low-sinuosity
stream with bars. The upper shallow marine assemblage, sedimentary
systems: 8 - dominated by deposits of lower and middle
foreshore beach zones, 9 - dominated by deposits of the upper
foreshore beach zone; 10 - carbonate (stromatolite) and
terrigenous carbonate-sulfate supratidal, lagoon deposits of the
shelf and shoreline of the forebulge;
11 - carbonate-terrigenous, carbonate, and carbonate-sulfate
deposits of the supratidal zone and various parts of the foreshore
zone. Nomenclature of stratigraphic units (Formation,
Subformation, Member): Al
11 - Aleshino, Lower Subformation,
Lower Member; Al
12 - same, Upper Member; Al
2 - same,
Upper Subformation; Cst - Chistyakovo; Gr - Greben;
Vs - Veselaya; Rl
1 - Redkolesnaya, Lower Subformation;
Rl
2 - same, Upper Subformation; Vn - Vanavara;
Osk - Oskobinsky; Kt - Katanga; Ost - Ostrovnaya;
Sb - Sobinsky; Tt - Teter.