sentences:  The coarse-grained sandstone of the lower part of the "Indotrigonia africana" Member that shows highly variable transport directions is interpreted as deposits of large tidal channels.Grain-size, large-scale sedimentary structures, and the lack of both trace fossils and epifaunal and infaunal body fossils suggest high water energy and frequent reworking.This basal succession passes upward in cross-bedded sandstone and minor siltstone and claystone with flaser or lenticular bedding that are interpreted as tidal flat and tidal channel deposits.