Lashkarak formation
type: Concept
preferred label: سازند لشکرک @fa
related: Middle Ordovician

Shirgesht Formation
type: Concept
preferred label: سازند شیرگشت @fa
related: Middle Ordovician

Lower Ordovician
type: Concept
preferred label: اردویسین زیرین @fa
related: Middle Ordovician

Upper Ordovician
type: Concept
preferred label: اردویسین فوقانی @fa
related: Middle Ordovician

Blackriverian
type: Concept
broader: Middle Ordovician
preferred label: بلک ریورین @fa

Trentonian
type: Concept
broader: Middle Ordovician
preferred label: ترنتونین @fa

Champlainian
type: Concept
broader: Middle Ordovician
preferred label: چامپلینین @fa

Everton Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند اورتون @fa

Bromide Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند برومید @fa

Partridge Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند پارتریج @fa

Platteville Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند پلاتویل @fa

Dubuque Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند دوبوک @fa

Schenectady Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند شنکتادی @fa

Swan Peak Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند قله سوان @fa

Cloridorme Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند کلوریدورم @fa

Normanskill Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند نورمن اسکیل @fa

Winnipeg Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند وینیپگ @fa

Holston Formation
type: Concept
broader: Middle Ordovician
preferred label: سازند هولستون @fa

Bigfork Chert
type: Concept
broader: Middle Ordovician
preferred label: سنگ آتش زنه بیگفورک @fa

Bigby-Cannon Limestone
type: Concept
broader: Middle Ordovician
preferred label: سنگ آهک بیگ بی- کنون @fa

Lenoir Limestone
type: Concept
broader: Middle Ordovician
preferred label: سنگ آهک لنویر @fa

Decorah Shale
type: Concept
broader: Middle Ordovician
preferred label: شیل دکورا @fa

Glenwood Shale
type: Concept
broader: Middle Ordovician
preferred label: شیل گلن وود @fa

Woods Hollow Shale
type: Concept
broader: Middle Ordovician
preferred label: شیل وودزهالو @fa

Chazyan
type: Concept
broader: Middle Ordovician
preferred label: کازیان @fa

Galena Dolomite
type: Concept
broader: Middle Ordovician
preferred label: گالن دولومیت @fa

High Bridge Group
type: Concept
broader: Middle Ordovician
preferred label: گروه پل مرتفع @fa

Stones River Group
type: Concept
broader: Middle Ordovician
preferred label: گروه رود استون @fa

Simpson Group
type: Concept
broader: Middle Ordovician
preferred label: گروه سیمپسون @fa

Millbrig Bentonite Bed
type: Concept
broader: Middle Ordovician
preferred label: لایه بنتونیت میلبریگ @fa

Llandeilian
type: Concept
broader: Middle Ordovician
preferred label: للاندیلین @fa

Llanvirnian
type: Concept
broader: Middle Ordovician
preferred label: للانویرنین @fa

Middle Ordovician
type: Concept
broader: Ordovician
narrower: Glenwood Shale
narrower: Llandeilian
narrower: Schenectady Formation
narrower: Cloridorme Formation
narrower: Champlainian
narrower: Lenoir Limestone
narrower: Holston Formation
narrower: Everton Formation
narrower: Simpson Group
narrower: Woods Hollow Shale
narrower: Galena Dolomite
narrower: Llanvirnian
narrower: Platteville Formation
narrower: Normanskill Formation
narrower: Bigfork Chert
narrower: Swan Peak Formation
narrower: Bromide Formation
narrower: Chazyan
narrower: High Bridge Group
narrower: Decorah Shale
narrower: Blackriverian
narrower: Stones River Group
narrower: Millbrig Bentonite Bed
narrower: Dubuque Formation
narrower: Winnipeg Formation
narrower: Trentonian
narrower: Bigby-Cannon Limestone
narrower: Partridge Formation
preferred label: اردویسین میانی @fa
related: Upper Ordovician
related: Lashkarak formation
related: Lower Ordovician
related: Shirgesht Formation

Ordovician
type: Concept
narrower: Middle Ordovician
preferred label: اردویسین @fa