Geology Reference
In-Depth Information
Geological
Age in
Eon
Era Period or
millions
Life events
'Age'
of years
Recent
0.01
Wide diversity of life
Quaternary
1.8
Humanoids
Tertiary
65 Age of mammals
Major extinction of life
Cretaceous
146
Wide diversity of life
Jurassic
208
First birds and mammals
Triassic
245 First dinosaurs
Major extinction of life
Permian
290
Mammal-like reptiles
Carboniferous
362
First reptiles
Devonian
418
First amphibians
Silurian
443
First land plants
Ordovician
490
First fish
Cambrian
544 First shells
Base Cambrian Boundary
Proterozoic
2500
Multi-celled organisms
Archaean
3800
Single celled organisms
Hadean
4554
Origin of the Earth
The geological column.
The geological column shows the geological periods or 'ages' to
which fossils and the rocks that contain them can be assigned.
en masse . Life hung by a thread and took twenty million years to
recover, but by latest Triassic times the first mammals had
evolved.
In the warm tropical seas of the 'Jurassic', named after the
Jura mountains in France and Switzerland, fish-life abounded
in the sea, ammonites came in all shapes, sizes and colours and
on the land dinosaurs ruled the world - it was a time of wide
 
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