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Glossary entry


Stratigraphic time

Millions years ago: 485.4 ±1.9 – 443.8 ±1.5

Phanerozoic > Paleozoic

EdCaCaCaCaOrOrOrSiSiSiSiDeDeDeCarCarPePePeTrTrTrJuJuJuCreCrePalEoOlMiPliPleHol


Eon Era System Period Series Epoch Stage Millions
years ago
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Upper Ordovician Hirnantian 443.8±1.5
Katian 445.2±1.4
Sandbian 453±0.7
Middle Ordovician Darriwilian 458.4±0.9
Dapingian 467.3±1.1
Lower Ordovician Floian 470±1.4
Tremadocian 477.7±1.4


Prague Basin, Czechia
Kosov formation (Hirnantian)
Králův Dvůr formation (Katian – Hirnantian)
Bohdalec formation (Katian)
Zahořany formation (Sandbian – Katian)
Vinice formation (Sandbian)
Letná formation (Sandbian)
Libeň formation (Sandbian)
Dobrotiv formation (Darriwilian – Sandbian)
Šárka formation (Darriwilian)
Klabava formation (Floian – Dapingian)
Mílina formation (Tremadoc – Floian)
Třenice formation (Tremadoc)

United Kingdom stratigraphy
Ashgill (Katian – Hirnantian)Hirnantian (Hirnantian)
Rawtheyan (Katian)
Cautleyan (Katian)
Pusgillian (Katian)
Caradoc (Sandbian – Katian)Streffordian (Katian)
Cheneyan (Katian)
Burrellian (Sandbian – Katian)
Aurelucian (Sandbian)
Llanvirn (Darriwilian)Llandeilian (Darriwilian)
Abereiddian (Darriwilian)
Arenig (Floian – Darriwilian)Fennian (Dapingian – Darriwilian)
Whitlandian (Floian – Dapingian)
Moridunian (Floian)
Tremadoc (Tremadoc)Migneintian (Tremadoc)
Cressagian (Tremadoc)

Stratigraphy of Baltiscandia
Harju (Katian – Hirnantian)Porkuni (Hirnantian)
Pirgu (Katian)
Vormsi (Katian)
Nabala (Katian)
Viru (Darriwilian – Katian)Rakvere (Katian)
Oandu (Katian)
Keila (Katian)
Haljala (Sandbian)
Kukruse (Sandbian)
Uhaku (Darriwilian)
Lasnamägi (Darriwilian)
Aseri (Darriwilian)
Oeland (Tremadoc – Darriwilian)Kunda (Darriwilian)
Volkhov (Dapingian – Darriwilian)
Billingen (Floian)
Hunneberg (Floian)
Varangu (Tremadoc)
Pakerort (Tremadoc)

Australia
Bolindian (Katian – Hirnantian)
Eastonian (Katian)
Gisbornian (Sandbian)
Darriwilian (Darriwilian)
Yapeenian (Dapingian – Darriwilian)
Castlemainian (Dapingian)
Chewtonian (Floian)
Bendigonian (Floian)
Lancefieldian (Tremadoc – Floian)
Warendan (Tremadoc)

North America
Cincinnatian (Katian – Hirnantian)Gamachian (Hirnantian)
Richmondian (Katian)
Maysvillian (Katian)
Edenian (Katian)
Mohawkian (Sandbian – Katian)Chatfieldian (Sandbian – Katian)
Turinian (Sandbian)
Whiterockian (Dapingian – Sandbian)Chazyan (Darriwilian – Sandbian)
Rangerian (Dapingian)
Ibexian (Cambrian stage 10 – Floian)Blackhillsian (Floian)
Tulean (Tremadoc – Floian)
Stairsian (Tremadoc)
Skullrockian (Cambrian stage 10 – Tremadoc)

China
Hirnantian (Hirnantian)
Chientangkiangian (Katian)
Neichiashanian (Sandbian – Katian)
Darriwilian (Darriwilian)
Dapingian (Dapingian)
Yiyangian (Floian)
Xinchangian (Tremadoc)

Morocco, Anti-Atlas
Second Bani group (Katian – Hirnantian)Upper Second Bani formation (Hirnantian)
Lower Second Bani formation (Katian – Hirnantian)
Ktaoua group (Sandbian – Katian)Upper Ktaoua formation (Katian)
Upper Tiouririne formation (Katian)
Lower Ktaoua formation (Sandbian – Katian)
First Bani group (Darriwilian – Sandbian)Izegguirene formation (Sandbian)
Ouine-Inirne formation (Darriwilian)
Guezzart formation (Darriwilian)
Bou-Zeroual formation (Darriwilian)
Taddrist formation (Darriwilian)
Outer Feijas group (Tremadoc – Darriwilian)Tachilla formation (Darriwilian)
Upper Fezouata formation (Floian)
Lower Fezouata formation (Tremadoc)

Siberian platform
Burian (Katian – Hirnantian)
Nirundian (Katian)
Dolborian (Katian)
Baksian (Sandbian – Katian)
Chertovskian (Sandbian)
Kirensko-Kudrinian (Darriwilian)
Volginian (Darriwilian)
Mukteian (Darriwilian)
Vikhorevian (Darriwilian)
Kimaian (Dapingian – Darriwilian)
Ugorian (Floian)
Nyaian (Tremadoc)

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