Floian

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

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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 Floian is the second stage of the Ordovician. It succeeds the Tremadocian with which it forms the Lower Ordovician epoch. It precedes the Dapingian stage of the Middle Ordovician. The Floian extended from 477.7 ± 1.4 to 470.0 ± 1.4 million years ago. The lower boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus.

单词	Floian
释义	Floian 英语百科 Floian 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 Floian is the second stage of the Ordovician. It succeeds the Tremadocian with which it forms the Lower Ordovician epoch. It precedes the Dapingian stage of the Middle Ordovician. The Floian extended from 477.7 ± 1.4 to 470.0 ± 1.4 million years ago. The lower boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus.
随便看	reverture的意思 revert voltage的意思 revert war的意思 revervation area的意思 reverwash的意思 revery的意思 ref的意思 revesal的意思 revesal phenomenon的意思 Revesby的意思 revesible temper brittleness的意思 revesing permanent mould的意思 revest的意思 revest的意思 revest的意思 revestiaries的意思 revestiary的意思 revesting的意思 revest的意思 revestries的意思 revestry的意思 revest的意思 revesture的意思 revesz的意思 revet的意思