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Cretaceous




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Cretaceous Period
145–66 million years ago

PreЄ

Є

O

S

D

C

P

T

J

K

Pg

N




Mean atmospheric O
2 content ower period duration

c. 30 vol %[1][2]
(150 % of modern level)

Mean atmospheric CO
2 content ower period duration

c. 1700 ppm[3][4]
(6 times pre-industrial level)

Mean surface temperature ower period duration

c. 18 °C[5][6]
(4 °C above modern level)


Key events in the Cretaceous


view • discuss • edit


-140 —

–

-130 —

–

-120 —

–

-110 —

–

-100 —

–

-90 —

–

-80 —

–

-70 —

–




M
e
s
o
z
o
i
c

 

Jurassic

 

Paleogene

E
a
r
l
y

L
a
t
e

Berriasian

Valanginian

Hauterivian

Barremian

Aptian

Albian

Cenomanian

Turonian

Coniacian

Santonian

Campanian

Maastrichtian

 

 

 

 















C
r
e
t
a
c
e
o
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An approximate timescale of key Cretaceous events.
Axis scale: millions of years ago.


The Cretaceous, accordin tae present scienteefic consensus, is a geologic period an seestem that spans 79 million years frae the end o the Jurassic Period 145 million years ago (Mya) tae the beginning o the Paleogene Period 66 Mya.



References |




  1. ↑ Image:Sauerstoffgehalt-1000mj.svg


  2. ↑ Image:OxygenLevelsThroughEarthHistory.png


  3. ↑ Image:Phanerozoic Carbon Dioxide.png


  4. ↑ Image:CO2LevelsThroughEarthHistory.png


  5. ↑ Image:All palaeotemps.png


  6. ↑ Image:TemperatureLevelsOverEarthHistory.png












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