Geology Reference
In-Depth Information
THE GEOLOGICAL TIMESCALE
ERA
PERIOD
EPOCH
First appearances
SUB-ERA
Holocene
Pleistocene
Quaternary
Pleistogene
0
1.81
Pliocene
5.3
Neogene
Miocene
Hominids
23.0
33.9
Oligocene
Proboscideans
Early anthropoids
Palaeogene
Eocene
Rodents
50
Horses
Grasses
55.8
Palaeocene
Primates
65.5
Early grasses
Marsupial mammals
Upper
100
99.6
Cretaceous
Lower
Placental mammals
Flowering plants
(angiosperms)
145.5
150
Birds
Upper
161.2
175.6
Middle
Jurassic
Lower
200
199.6
Early mammals
Upper
Triassic
228
Middle
Dinosaurs (saurischians and ornithischians)
245
Lower
250
251
Upper
Middle
260.4
270.6
Mammal-like reptiles (therapsids)
Permian
Lower
300
299
Conifers
Winged insects
Reptiles (cotylosaurs)
Pennsylvanian
Reptiles (pelycosaurs)
318.1
Carboniferous
Mississippian
350
Amphibians
(labyrinthodonts)
359.2
Gymnosperms
Sharks
Upper
Devonian
385.3
Middle
397.5
400
Lower
416
Land plants
Wingless insects
Silurian
Jawed fish
Land plant spores
443.7
450
Ordovician
Agnathans
488.3
500
Cambrian
Trilobites
Ediacara metazoans
542
550
PROTEROZOICAEON
2500
ARCHAEAN AEON
PRISCOAN AEON
4000
4,600
Figure A1 The geological timescale.
 
 
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