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Geological Periods - Home

Cambrian Period
Ordovician Period
Silurian Period
Devonian Period
Carboniferous Period
Permian Period
Triassic Period
Jurassic Period
Cretaceous Period
Tertiary Period
Quaternary Period
The Quaternary Period
1.8 Million Years Ago to Present

Established Theory:

Start:

Just above top of magnetic polarity chronozone C2n (Olduvai) and the extinction level of calcareous nannofossil Discoaster brouweri (base Zone CN13). Above are lowest occurrence of calcareous nannofossil medium Gephyrocapsa spp. and extinction level of planktonic foraminifer Globigerinoides extremus.

Index Fossils:

Pelecypod and Gastropod

Evolution:

None

Geography:

Modern continents

Rocks:


Alternative Theory:

In Progress


Conclusions:

In Progress