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The Cambrian period had an abundant amount of marine organisms and the Earth was covered in oceans, All life was in oceans.
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Area north of tropics was almost entirely ocean with supercontinent Gondwana dominating south. known for diverse marine invertebrates with some signs of early vertebrates.
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Earth underwent considerable chamges from the melting of large glaciers causing rising sea levels. Coral reefs first appeared and fish went through remarkable evolution.
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Primarily small plants but first land living verebrates introduced as well as wingless insects and arachnids. There was two supercontinents, Gondwana and Euramerica
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Earliest reptiles and abundant sharks and amphibians. Scale tree and coal forming forest. Amnoite eggs gave ancestors of birds ability to lay their eggs and not fear desiccation.
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Largest mass extinction in recorded history of earth. Extinction of many kinds of marine life. Massive areas of land and water. Single ocean known as Panthalassa.
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After mass extinctio form Permian period new groups flourished. Earliest dinosaurs found. There was abundant cycades and conifers.
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Abundant plant eating dinosaurs roaming the earth and ammonites. Earliest birds like pterosuars.
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Last portion of "age of dinosaurs". The break up of the world-continent Pangea continued. Great decline of brachiopods. Abundance of boney fish and earliest flowering plants.
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Earliest placental mammals, many modedern mammals and large running mammals.
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There was large carnivores, neanderthals, humans and mastodons. Climate was much drier and colder early on than in present time.
