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Geologic time
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Subcategories
This category has the following 4 subcategories, out of 4 total.
C
Cenozoic
(3 C, 17 P)
G
Geologic time articles in Popular Science Monthly
(19 P)
M
Mesozoic
(3 C, 3 P)
P
Paleozoic
(6 C, 1 P)