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Geologic Time Scale

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Pleistocene
0-1 Million: 4 ice ages. Many mammals became extinct, man apears.
Tertiary
1-63 Million: Continent builidng, modern plants, mammals dominant.
Cretaceous
63-135 Million: Water innundates much of earth, dinosaurs become extinct.
Jurassic
135-181 Million: Mild Climates, giant land and sea dinosaurs, toothed birds.
Triassic
181-230 Million: Arid Climates, dinosaur and mammal prototypes, first pupal insects.
Permian
230-280 Million: Extremes of climate, trilobites become extinct, reptiles flourish.
Carboniferous
280-345 Million: Warm and humid, coal swamp forests, gigantic insects.
Devonian
345-405 Million: Varied climate, many fish, amphibians, insects evolve.
Silurian
405-425 Million: Mild climate, many coral reefs, first life on land.
Ordovician
425-500 Million: Mild climate, seaweeds, clams, nautiloids, first vertebrates.
Cambrian
500-600 Million: Moderate upheavals, trilobites, mollusks, first crustaceans.
Pre-Cambrian
600-? Million: Constant earth upheavals, soft-bodied marine animals.
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