Proterozoic
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The Proterozoic is the third of the four geologic eons of Earth's history, spanning the time interval from 2500 to 538.8 Ma, and is the longest eon of Earth's geologic time scale. It is preceded by th
Rodinia, about 900 Ma
Phanerozoic
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The Phanerozoic is the current and the latest of the four geologic eons in the Earth's geologic time scale, covering the time period from 538.8 ± 0.6 million years ago to the present. It is the eon du
Proterozoic
…the time interval from 2500 to 538.8 Ma, and is the longest eon of Earth's geologic time scale. It is preceded by the Archean and followed by the Phanerozoic, and is the most recent part of the Precambrian "supereon". The Proterozoic is subdivided into three geologic eras (from oldest to youngest): the…
Dalmanites limulurus, a species of Silurian trilobites
Cephalaspis, a jawless fish
Proterogyrinus, a Carboniferous amphibian (non-amniote tetrapod)
Plateosaurus, an early sauropodomorph dinosaur