Table of Geologic Time And Formations

The source of inspiration for
Mr. Potato Head: Defender Of The Geologic Ecosystem.
From Webster's New Collegiate Dictionary, 1977, page 481.
Copyright © 1977 by G. & C. Merriam Co.



Eras Periods
And
Systems
Epochs
And
Series
Approximate Number
of Years Ago
Earliest Record
of Animals
Earliest Record
of Plants
Cenozoic Quaternary Holocene
(recent)
Pleistocene
(Glacial)




Mankind

Tertiary Pliocene
Miocene
Oligocene
Eocene
Paleocene




70,000,000


Mesozoic Cretaceous Upper
Placental Mammals
Lower

Birds
Grasses and
Cereals
Jurassic
160,000,000 Mammals Flowering Plants
Triassic


Ginkgoes
Paleozoic Permian
230,000,000
Cycads and
Conifers
Pennsylvanian

Insects Primitive
Gymnosperms
Mississippian

Reptiles
Devonian
390,000,000 Amphibians


Vascular Plants:
Lycopodiums,
Equisetums,
Ferns, etc.
Silurian

Fishes
Ordovician
500,000,000
Mosses
Cambrian
620,000,000
Invertibrates
Spores of
Uncertain
Relationship

Marine Algae
Proterozoic

1,420,000,000

Archeozoic

2,300,000,000


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