Visualizing the Precambrian - Free Printable

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- The Cenozoic Era began approximately 66 million years ago (Ma), marked by the boundary between the Paleocene Epoch and the Cretaceous Period.
- The Mesozoic Era began approximately 251 Ma, marked by the boundary between the Triassic Period and the Permian Period.
- The Paleozoic Era began approximately 542 Ma, marked by the boundary between the Cambrian Period and the Ediacaran Period.
- The Proterozoic Eon began approximately 2500 Ma, marked by the boundary between the Neo-Meso-Paleoproterozoic subdivisions and the Archean Eon.
- The Archean Eon began approximately 4000 Ma, marked by the boundary with the Hadean Eon.
- The Hadean Eon began approximately 4600 Ma, corresponding to the origin of Earth.

Parent Tip: Review the logic above to help your child master the concept of geologic time worksheet.

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Visualizing the Precambrian