https://gcmdservices.gsfc.nasa.gov/kms/concept/af145656-986a-4969-bb77-6e5b2cff1ede
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definition | The Phanerozoic Eon is the current geologic eon in the geologic time scale, and the one during which abundant animal and plant life has existed. It covers 541 million years to the present, and began with the Cambrian Period when animals first developed hard shells preserved in the fossil record. | ||||||||||||||||
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in scheme | chronounits original |