Geocollections

Jurassic

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Stratigraphy	Index	Index add'l	Type	Rank	Scope	Belongs to	Age (Ma)		Age
Stratigraphy	Index	Index add'l	Type	Rank	Scope	Belongs to	Base	Top	Age
Lower Jurassic	J₁		chronostratigraphy	Series	global	Jurassic	201.4	174.7
Middle Jurassic	J₂		chronostratigraphy	Series	global	Jurassic	174.7	161.5
Upper Jurassic	J₃		chronostratigraphy	Series	global	Jurassic	161.5	145.0

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