Ediacaran biota
Ediacara-type assemblage: the Ediacara-type assemblage consists of fossils preserved in areas near the mouths of rivers (prodeltaic). They are found in interbedded sandy and silty layers formed below the normal base of wave-related water motion, in waters shallow enough to be affected by wave motion during storms. Most fossils are preserved as imprints in microbial mats, but a few are preserved within sandy units.