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This is the oldest period known to man. It is about 5 times longer than the paleozoic and the mesozoic periods combined.
Periods within the cambrien:
Proterozoic
Archean -
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Invertabrates are dominant, mollusks become abundant, and later on some jawless and armored fish come into the world.
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Earliest terrestrial plants and animals.
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Armored fish go extinct, but abundance of several species of fish. Earliest amphibians and ammonites
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Some sharks and amphibians a long with large swamps and coal forming forests.
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Extinction of many types of marine animals including trilobites.
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Earliest dinosaurs, abundant cycads and conifers.
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Earliest birds and mammals, abundant dinosaurs and ammonites.
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Climax of dinosaurs followed by their extinction. Great decline of brachiopods. Abundance of bony fish.... and yes thi means tyrannosaurus died. :(
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Earliest Placental Mammals, modern mammals, large running mammals.
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Humans and all the other well known mammals come into place. :P