The Geologic Time Scale - Periods
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Last updated 12:25 PM on 4/7/26
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12 Terms
1
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Precam time
Earth forms
2
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Cam
shelled marine invertebrates appear.
3
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Ord
echinoderms appear.
4
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Sil
land plants and animals appear.
5
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Dev
Age of fishes begins.
6
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Car
giant cockroaches and dragonflies appear.
7
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Per
pangea comes together
8
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Tri
Dinosaurs appear
9
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Jur
Dinosaurs are the dominant life-form.
10
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Cre
modern birds appear.
11
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Ter
Age of mammals.
12
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Qua
complex human societies develop.
