Ashgillian
type: Concept
narrower: Hirnantian
preferred label: آشگیلین @fa

Hirnantian
type: Concept
broader: Ashgillian
broader: Bighorn Dolomite
preferred label: هیرنانسین @fa

Bighorn Dolomite
type: Concept
narrower: Hirnantian
preferred label: دولومیت بیگورن @fa