From ref. 2006:
Tidal channel-related rudist <bioherms> consist of meter-thick lenses or <bioherms> (Cummings, 1932) dominated by rudists, overlying algal-mud banks having an erosive contact (Figures 7a, 8). The horizontal dimensions of the rudist <bioherms> are less than 10 m. They are stacked in a progradational system and are overlain by algal-mud banks. The rudist communities are monospecific and have bafflestone-framestone structures (Embry and Klovan, 1971). The <bioherms> have filled preexisting depressions cut through the algal-mud banks. It is plausible that they have affinities with tidal channels because (1) they occur in a zone dominated by cryptalgal laminites inferred to have formed in intertidal environments, (2) they have the character of submarine deposits, and (3) they have prograded in depressions over a lag breccia rich in mud and stromatolitic clasts.

