Age of InvertebratesThe Cambrian Explosion: A great 'boom' of undersea life, including strange arthropods, marine megafauna, and multiple hard shelled creatures.
There were said to be 15,000 species that evolved from trilobites, as they were the leading arthropods. Evolution for water to land access had already begun. Cambrian–Ordovician Extintion
Marking the end of the Cambrian period was an extinction event that kill just under 20% of life, which was entirely aquatic.
GeologyThe supercontinent Gondwana was formed out of Africa, Australia, Antarctica, South America, and India.
Gondwana itself had split from the even larger continent of Rodinia. Some other landmasses, known as cratons, were Laurentia, Avalonia, Siberia, and Baltica. These cratons and continents were then pushed into the equator by plate tectonics. ClimateThe Cambrian marked the end of the marinoan ice age. During the Cambrian, it was mostly tropical or subtropical, with most life flourishing in shallow continental shelves.
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