• "Unit K5/29 Interval 45.60-49.80m Thickness 4.20m

•Dolomarl: mottled yellowish grey, microcrystalline (dolomudstone), with dolostone conglomerates in basal 10-20cm. The upper half shows low-contrast alternation of recessive dolomarls and resistant argillaceous dolostones. The rock shows fine undulating lamination defined by slim shale partings. A thin (3-4cm) graded bed enriched in fine-grained (0.1-0.3mm) bioclasts and polymicritic sand at 0.6-0.7m above the base. Fossils include conchostracans, non-marine ostracods, non-marine bivalves, fish scales and plant detritus.

•Unit K5/30 Interval 49.80-51.80m Thickness 2.00m

•Dolostone: pale grey, microcrystalline, thick-bedded, partly sandy and argillaceous, with fine undulating lamination, slickensided. The basal part shows microbrecciation in polished slabs and contains the abundant non-marine bivalves Palaeomutela. The upper half of the unit hosts abundant marine fossils [including bivalves, brachiopods and conodonts]. The occurrence of numerous Lithophaga (=Modiola) has defined the historic name 'Modiola Horizon'. The upper part of the unit contains nests of loose chalcedony-quartz rhombs, indicating the former presence of anhydrite nodules.

•Unit K5/31 Interval 51.80-52.60m Thickness 0.80m

•Dolomarl with interlayers of dolostone and packbreccia. In 15cm above the chalcedony-quartz rhomb horizon, there is a 5-6cm thick packbreccia of subrounded grey-coloured dolomite clasts embedded in red-coloured argillaceous matrix. The top of this breccia locally shows colour inversion to red clasts and grey matrix. Red-coloured clasts are also encountered at the base of this breccia. The breccia is overlain by a rounded-grain intraclastic calcarenite (1-2cm), which is in turn succeeded by red shale and a second horizon of fine-grained argillaceous-dolomitic breccia, very similar in its appearance to the lower horizon." (Nurgaliev et al. 2015)