. "Upper Vendian" . "546 million years" . "ediacaran" . . "Late Ediacaran" . . . "Ediacarian" . "Ediacaran period" . "Vendian-aged" . "Upper Precambrian" . "Vendian Age" . . . . "Ediacaran or Vendic" . . "Ediacaran" . "Late" . "Vendian" . "Ediacaran Period" . "Boundaries of the Ediacaran Period" . "Shuram negative C-isotope Excursion" . . "550 Ma" . "Late Neoproterozoic" . . . "Ediacaran" . "Ediacaran Period." . . . . "Ediacara fauna" .