Sandbian

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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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

←

Ordovician meteor event

←

Archaeocyatha extinction

Key events of the Ordovician Period.
ICS approved stages.

Axis scale: millions of years ago.

The Sandbian is the first stage of the Upper Ordovician. It follows the Darriwilian and is succeeded by the Katian. Its lower boundary is defined as the first appearance datum of the graptolite species Nemagraptus gracilis around 458.4 ± 0.9 million years ago. The Sandbian lasted for about 5.4 million years until the beginning of the Katian around 453.0 ± 0.7 million years ago.

单词	Sandbian
释义	Sandbian 英语百科 Sandbian 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 Sandbian is the first stage of the Upper Ordovician. It follows the Darriwilian and is succeeded by the Katian. Its lower boundary is defined as the first appearance datum of the graptolite species Nemagraptus gracilis around 458.4 ± 0.9 million years ago. The Sandbian lasted for about 5.4 million years until the beginning of the Katian around 453.0 ± 0.7 million years ago.
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