Fig. 3.

Major differences in low-productivity vs. productive Ediacaran marine environments. Schematic diagrams are shown for a extensive oligotrophic and shallow-marine epicontinental basin margins of Baltica often dominated by bacterial productivity where Ediacara soft-bodied fauna flourished and where denitrification and anammox likely were restricted to sediments; and b eutrophic and deeper-marine shelf settings of the South Oman Salt Basin, where green algae thrived as a primary producer and demosponges were abundant, but Ediacara soft-bodied fauna was not prominent (with Ediacara biota fossils also absent in correlative Ediacaran outcrops in northern Oman). On productive continental margins, denitrification and anammox likely occurred in both the water column and sediments