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The Cambrian period has a abundant amounts of marine organsisms and the Earth was covered in oceans. All life was in the ocean.
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Coral reefs made its first appearence after melting of glaciers, climates stablized. Also the evolution of fish's, freshwater fish and fish with jaws. Along with the evolution of plants, vascular plant fossiles.
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Earliest amphibians and ammonites. Armed fish go extnct but abundance of several species of fish.
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Earliest reptiles. Great coal forming forests. Abundant sharks and amphibians, large and numerous scale trees and seed ferns.
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The Permian period was the extinction of many marine animals including trilobites.
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Earliest dinosaurs and abundant cycades and conifers.
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Earliest birds and mammals. Abundant dinosaurs and ammonities.
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A lot happend during this period it was the earliest flowering plants. Climax of dinosaurs and ammonities follwed by extinction. Decline of brachipods and develope of bony fish.
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Earliest placental mammals many modern types of mammals, large running mammals. Abundant grazing animals.
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During this period was the Ice Age, sea levels fall and rize with each period of freezing and thawing. Due to the climate mammoths mastodon, giant bison and woolly rhinoceros, wall adapted to the cold but had a hard time when it came to food.
