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Academia - Collins Scientific Pocket Dictionaries - Biology
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Appendix G - Geological Time Scale

The era - the period - the beginning 610 years ago

Cenozoic era
Fourth 1
Third 55

Mesozoic eras
Cretaceous 120
Jurassic 155
Triassic 190

Paleozoic era
Permian 215
Carbon 300
Devonian 350
Silurian 390
Ordovician 480
Cambrian 550

The following table shows the presence of fossils for this time scale.

- Fossil record

Vertebrates - Invertebrates - Plants

Fourth Floor
Appearance of arthropods, abundance in molluscs

Third round
The emergence of mammals, the emergence of modern groups
Extinction of dinosaurs

Cretaceous floor
Dinosaur supremacy
The extinction of ammonites
The appearance of flowering plants

Jurassic role
The appearance of birds
Emergence of modern crustaceans, abundance in ammonites

Triassic role
Reptile boom
The appearance of dinosaurs
Decline of marine forms

Permian role
Degeneration of amphibians
Extinction of trilobites
Appearance of conifers

Carbon role
Appearance of reptiles

Devonian role
the appearance of amphibians,
Abundance of fish

Appearance of insects
Appearance of lichen, fern and horsetail

Silurian role
Degeneration of trilobites
Abundance in brachiopods

Ordovician role
Appearance of fish

The first land plants appear

Cambrian period
The presence of most members of the invertebrate phylum,
The flourishing of trilobites and brachiopods