отсутствуют в осадочном разрезе(Yet recent studies suggest that both latest Permian and earliest Triassic strata are missing in this section.ArcticFox)
ниже по разрезу(The association of Rhynchotrema increbescens and Hebertella frankfortensis in abundance is more or less characteristic, though both occur lower in the section.ArcticFox)