Katian

Key events in the Ordovician

view • discuss •

-485 —

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-480 —

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-475 —

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-470 —

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-465 —

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-460 —

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-455 —

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-450 —

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-445 —

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P
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Cambrian

O
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Silurian

E
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M
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L
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Tremadocian

Floian

Dapingian

Darriwilian

Sandbian

Katian

Hirnantian

←

First land plant spores

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Ordovician meteor event

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Archaeocyatha extinction

Key events of the Ordovician Period.
ICS approved stages.

Axis scale: millions of years ago.

The Katian is the second stage of the Upper Ordovician. It is preceded by the Sandbian and succeeded by the Hirnantian stage. The Katian began 453.0 ± 0.7 million years ago and lasted for about 7.8 million years until the beginning of the Hirnantian 445.2 ± 1.4 million years ago.

单词	Katian
释义	Katian 英语百科 Katian Key events in the Ordovician view • discuss • -485 — – -480 — – -475 — – -470 — – -465 — – -460 — – -455 — – -450 — – -445 — – P a l e o z o i c Cambrian O r d o v i c i a n Silurian E a r l y M i d d l e L a t e Tremadocian Floian Dapingian Darriwilian Sandbian Katian Hirnantian ← First land plant spores ← Ordovician meteor event ← Archaeocyatha extinction Key events of the Ordovician Period. ICS approved stages. Axis scale: millions of years ago. The Katian is the second stage of the Upper Ordovician. It is preceded by the Sandbian and succeeded by the Hirnantian stage. The Katian began 453.0 ± 0.7 million years ago and lasted for about 7.8 million years until the beginning of the Hirnantian 445.2 ± 1.4 million years ago.
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