Stromatolitic mounds in normal marine environment.
Maximum thickness 2 m (= syndepositional relief).
Virgin Member of Moenkopi Fm.

Ref 2184: These microbial structures from the Virgin Limestone Member of the Moenkopi Formation have been recently reinvestigated to determine if they represent true reefs. In places microbial mounds occur as isolated patch reefs, although elsewhere they coalesce to form tabular biostromes. These mounds are an agglomeration of smaller subunits that have wavy laminations and thrombolitic textures. Measurements on isolated mounds show that they attained a relief of 1-2 meters above the seafloor. 