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

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

San Juan Formation
type: Concept
preferred label: سازند سان جوان @fa
related: Lower Ordovician

Ilebeyk Formation
type: Concept
preferred label: سازند ایل‌بیک @fa
related: Lower Ordovician

Arenigian
type: Concept
broader: Lower Ordovician
preferred label: آرنیجین @fa

Tremadocian
type: Concept
broader: Lower Ordovician
preferred label: ترمادوسین @fa

Mascot Dolomite
type: Concept
broader: Lower Ordovician
preferred label: دولومیت ماسکوت @fa

Smithville Formation
type: Concept
broader: Lower Ordovician
preferred label: سازند اسمیتویل @fa

Shakopee Formation
type: Concept
broader: Lower Ordovician
preferred label: سازند شاکوپی @fa

Fillmore Formation
type: Concept
broader: Lower Ordovician
preferred label: سازند فیلمور @fa

Kindblade Formation
type: Concept
broader: Lower Ordovician
preferred label: سازند کیندبلاد @fa

Kingsport Formation
type: Concept
broader: Lower Ordovician
preferred label: سازند کینگزپورت @fa

Manitou Formation
type: Concept
broader: Lower Ordovician
preferred label: سازند مانیتو @fa

El Paso Group
type: Concept
broader: Lower Ordovician
preferred label: گروه ال پاسو @fa

Ellenburger Group
type: Concept
broader: Lower Ordovician
preferred label: گروه النبرگر @fa

Beekmantown Group
type: Concept
broader: Lower Ordovician
preferred label: گروه بیک من تاون @fa

Prairie du Chien Group
type: Concept
broader: Lower Ordovician
preferred label: گروه پریری دوچین @fa

Saint George Group
type: Concept
broader: Lower Ordovician
preferred label: گروه سنت جورج @fa

Lower Ordovician
type: Concept
broader: Ordovician
narrower: Manitou Formation
narrower: Kingsport Formation
narrower: Beekmantown Group
narrower: Arenigian
narrower: Saint George Group
narrower: Shakopee Formation
narrower: Prairie du Chien Group
narrower: Mascot Dolomite
narrower: Ellenburger Group
narrower: El Paso Group
narrower: Tremadocian
narrower: Kindblade Formation
narrower: Smithville Formation
narrower: Fillmore Formation
preferred label: اردویسین زیرین @fa
related: Shirgesht Formation
related: Knox Group
related: Arbuckle Group
related: Pacoota Sandstone
related: Rose Run Sandstone
related: Upper Ordovician
related: Lashkarak formation
related: Deadwood Formation
related: Middle Ordovician
related: San Juan Formation
related: Ilebeyk Formation

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

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

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

Pacoota Sandstone
type: Concept
preferred label: ماسه‌سنگ پاکوتا @fa
related: Lower Ordovician

Rose Run Sandstone
type: Concept
preferred label: ماسه‌سنگ رس ران @fa
related: Lower Ordovician

Deadwood Formation
type: Concept
preferred label: سازند دیدوود @fa
related: Lower Ordovician

Arbuckle Group
type: Concept
preferred label: گروه آربوکل @fa
related: Lower Ordovician

Knox Group
type: Concept
preferred label: گروه ناکس @fa
related: Lower Ordovician