the original interpretation of "arumberia" as a conical or cup-shaped depression structure is contrary to modern interpretations of "arumberia" as a bulge or impression. extensive burial from overburden typical in areas where "arumberia" is found would greatly compact any bulge or depression of a typical soft-bodied marine metazoan; however, it has been suggested that diagenic silicification, ferrugination or pyritization can provide critical fossil rigidity during burial which supports the soft-body marine metazoan description of "arumberia". the presence of pyrite may impart significant resistance to burial compaction in "arumberia", but to date no study has demonstrated a thick pyritic film of sufficient strength to withstand burial compaction above an unpyritized ediacaran fossil, which is thought to be a requirement for the preservational models that involve the pyritization of soft-body metazoans like "arumberia".