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.

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.
随便看	gravity head的意思 gravity head feeder的意思 gravity heater的意思 gravity heating的意思 gravity height correction的意思 gravity held check valve的意思 gravity high的意思 Gravity,High的意思 gravity high, gravity maximum的意思 gravity horizontal gradient的意思 gravity horizontal gradient survey的意思 gravity hot water heating system的意思 gravity hump的意思 gravity hydraulic transport的意思 gravity impulse的意思 gravity incline的意思 gravity inclined plane的意思 Gravity,Increased的意思 gravity insertion的意思 gravity inside the earth的意思 gravity installation的意思 gravity instrument的意思 gravity inversion method的意思 gravity irrigation的意思 Gravity knife的意思