• "[Krasnyi Yar Beds]

•Package A5/15 Interval 49.5 - 50.2m Thickness 0.7m

•Sandstone: greenish-grey and brownish-grey ('tobacco'), fine-grained, polymictic, calcareous and solid in the lower part (0.4m), argillaceous, thin laminated and soft in the upper part (0.3m). Thin plates (approx. 0.5-1cm) define lenticular lamination. The bedding planes contain rare fragments of brachiopod shells and charred plant debris.

•Package A5/16 Interval 50.2 - 52.9m Thickness 2.7m

•Limestone: light-grey, grey, grey with slight brownish tint, oolitic, pelloidal, arenaceous, massive, with subordinate lenses of yellowish-grey marls. Several intervals of limestone are riddled with numerous upright channels (10-15mm in diameter and up to 20cm in height). The package can be divided into four parts, from base to top:

•Bed A5/16-1 Interval 50.2 - 50.45m [0.00 - 0.25] Thickness 0.25m

•Succession of yellowish-grey sandstone, limestone and marl. Thin interbed of calcareous sandstone with the pebbles and shell debris forms the basement of the bed. Overlying soft marl contains only charred plant debris. The upper part of the bed includes the plates of pelloidal and arenaceous limestone with abundant small shells of molluscs and brachiopods. Randomly oriented bioclasts indicate bioturbation. Bioclastic pavements are locally preserved in the upper part of the bed.

•Bed A5/16-2 Interval 50.45 - 51.75m [0.25 - 1.55m] Thickness 1.3m

•LimestoneL light-grey with slight brownish tint, oolitic, with numerous bivalves Netschajewia dispersed over the entire interval. The top of this subunit is slightly undulating, erosional. The top surface is penetrated with numerous upright channels (10-15mm in diameter and up to 20cm in height) resembling Thallassinoides.

•Bed A5/16-3 Interval 51.75 - 52.70m [1.55 - 2.50m] Thickness 0.95m

•Limestone: light-grey, arenaceous, with the pebbles of carbonate rocks in the bottom and abundant upright channels over the entire interval. The upper part of the limestone becomes more arenaceous and contains the shell (bivalves) pavements.

•Bed A5/16-4 Interval 52.70 - 52.90m [2.50 - 2.70m] Thickness 0.20m

•Shell coquina: light-grey and yellowish-grey, formed by internal moulds of the large schizodont bivalves Oriocrassatella plana. The top of the bed is slightly undulating, erosional.

•Horizontally, 10-30m west of this station, bed A5/16-4 cuts off the underlying limestones up to the bottom of package A5/16. At this place, coquina is replaced with arenaceous cross-bedded limestone. Further to the west, arenaceous cross-bedded limestone is replaced again with oolitic limestone with 'Thallassinoides'.

•Package A5/17 Interval 52.9 - 53.6m Thickness 0.7m

•Sandstone: grey-brown, in the upper part yellowish-brown, polymictic with mudstone beds (up to 1cm). The lower part of the package (10cm) is more argillaceous and contains abundant subhorizontal branched trace fossils (approx. 5-8mm in diameter) and the numerous brachiopod shells Cancrinella cancrini. The upper part contains the pavements of Cancrinella and rare shells of the Kazanian index-fossil Licharewia rugulata.

•Package A5/18 Interval 53.6 - 57.6m Thickness 4.0m

•Alternation of marls and subordinate interbeds of shale and sandstone. Marls: greenish-grey, soft, fine laminated, with scyphozoan cnidarians, bivalves and brachiopods. Shale: dark-grey with greenish-grey tint, calcareous, fine lenticular laminated, platy, with charred plant debris and rare trace fossils.

•Package A5/19 Interval 57.6 - 60.6m Thickness 3.0m

•Alternation of sandstone and marl. Sandstone: brownish-yellow, polymictic, fine-grained, with subhorizontal lenticular lamination. Marl: yellowish-grey, silty, with numerous pavements of bivalve shells and upright borrows resembling Skolithos. The pavements and trace fossils define the boundaries with adjacent sandstone beds. The shells of Cancrinella normally oriented to the bedding planes of marl indicate bioturbation.

•Package A5/20 Interval 60.6 - 60.85m Thickness 0.25m

•Sandstone: greenish-grey, greenish-brown, finegrained, polymictic.

•Package A5/21 Interval 60.85 - 61.45m Thickness 0.60m

•Deepening-upward succession of yellowish-grey calcareous sandstone containing the lenses of marl and limestone. Large (up to 15cm) pebbles of light-grey limestones with marine Kazanian bivalves in the lower part.

•Package A5/22 Interval 61.45 - 63.70m Thickness 2.25m

•Sandstone: grey, fine grained, polymictic, lenticular laminated. Two equal beds of sandstone are divided by thin (0.15m) interbed of calcareous mudstone. Mudstone contains brachiopods Cancrinella, bivalves and charred plant debris." (Nurgaliev et al. 2015)