In light of the new clinoform structural model of the Neocomian, introduced at the last stratigraphic meeting, it is suggested to distinguish clinoform units instead of formations in the clinoform zone. Formations (12 in number) remain only west of the central part of the Neocomian basin (east-dipping clinoforms). In the eastern and southeastern zones of the basin, all the formations beyond the clinoform zone, which consist mostly of continental sediments, should be united into the Ust-Taz Group.
