Geological Time Lines- Paleozoic

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Cambrian
Shallow sea covers parts of continents; many trilobites; brachiopods, sponges, sea living invertebrates are present
Ordovician
Volcanoes and mountains form; north america flooded; first fish(jawless) appear; invertbrates flourish in seas
Silurian
Caledonian Mountains of Scandinavia rise; coral reefs form, first land plants, air breathing animals, jawed fish develop
Devonian
Acadian Mountains of New York rise; erosian of mountains deposit sediment in seas; first forests grow in swampy areas; first amphibians, sharks, insects develop
Carboniferous
Appalachian Mountains of North America form; ice covers large areas of earth; swamps cover lowlands; first mosses, reptiles, and winged insects appear; coal forming forests form; seed bearing ferns grow
Permian
Ural Mtn. of Russia rise; first cone bearing plants appear; ferns, fish, amphibians, reptiles flourish; sea living invertebrates- ex. trilobites die out