Ediacaran
adjective
Edi·a·car·an ˌē-dē-ˈa-k(ə-)rən 
-ə-ˈker-ən,
-ˈka-rən
variants or less commonly Ediacara
ˌē-dē-ˈa-k(ə-)rə
-ə-ˈker-ə,
-ˈka-rə
: being or belonging to an assemblage of extinct multicellular marine organisms of the Late Precambrian era
Ediacaran fauna
Ediacaran noun
Word History
Etymology
Ediacara Hills, South Australia
First Known Use
1959, in the meaning defined above