Tremadocian

Key events in the Ordovician

view • discuss •

-485 —

–

-480 —

–

-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 —

–

-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 Tremadocian is the lowest stage of Ordovician. Together with the later Floian stage it forms the Lower Ordovician epoch. The Tremadocian lasted from 485.4 ± 1.9 to 477.7 ± 1.4 million years ago. The base of the Tremadocian is defined as the first appearance of the conodont species Iapetognathus fluctivagus at the GSSP section in Newfoundland.

单词	Tremadocian
释义	Tremadocian 英语百科 Tremadocian 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 Tremadocian is the lowest stage of Ordovician. Together with the later Floian stage it forms the Lower Ordovician epoch. The Tremadocian lasted from 485.4 ± 1.9 to 477.7 ± 1.4 million years ago. The base of the Tremadocian is defined as the first appearance of the conodont species Iapetognathus fluctivagus at the GSSP section in Newfoundland.
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