Hirnantian
General info
Belongs to
Upper Ordovician
Type chronostratigraphy
Rank Stage
Original rank regional formation and stage
Scope global
Status formal standard
Author Bancroft
Year 1933
Etymon Cwm Hirnant near Bala, in northern Wales
Age top (Ma) 443.8
Age base (Ma) 445.2
Date changed 2022-11-04
References (2)Related units (1)Specimens (5390)Samples (2783)
NumberNameLocalityDepth (m)StratigraphyImage
TUG 134-1302 Tabulata Veadla quarry Porkuni Stage
TUG 134-1143 Ptilodictya scalpellum Ahula, Järvamaa Porkuni Stage
TUG 40-200 limestone Porkuni Porkuni Stage
TUG 33-76 Hippocardia Porkuni Porkuni Stage
TUG 300-122 Gastropoda Porkuni Porkuni Stage
TUG 300-121 Gastropoda Porkuni Porkuni Stage
TUG 300-120 Gastropoda Porkuni Porkuni Stage
TUG 300-119 Gastropoda Porkuni Porkuni Stage
TUG 300-118 Gastropoda Porkuni Porkuni Stage
TUG 300-117 Gastropoda Porkuni Porkuni Stage
TUG 300-116 Gastropoda Porkuni Porkuni Stage
TUG 300-115 Gastropoda Porkuni Porkuni Stage
TUG 300-114 Gastropoda Porkuni Porkuni Stage
TUG 300-113 Gastropoda Porkuni Porkuni Stage
TUG 300-112 Gastropoda Porkuni Porkuni Stage
TUG 300-111 Gastropoda Porkuni Porkuni Stage
TUG 300-110 Gastropoda Porkuni Porkuni Stage
TUG 300-109 Gastropoda Porkuni Porkuni Stage
TUG 300-108 Gastropoda Porkuni Porkuni Stage
TUG 300-107 Gastropoda Porkuni Porkuni Stage
TUG 300-106 Gastropoda Porkuni Porkuni Stage
TUG 300-105 Gastropoda Porkuni Porkuni Stage
TUG 300-104 Gastropoda Porkuni Porkuni Stage
TUG 300-103 Gastropoda Porkuni Porkuni Stage
TUG 300-102 Gastropoda Porkuni Porkuni Stage
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