Topic: Era (geology) - Wikipedia

A geologic era is a subdivision of geologic time that divides an eon into smaller units of time. The Phanerozoic Eon is divided into three such time frames: the Paleozoic, Mesozoic, and Cenozoic (meaning 'old life', 'middle life' and 'recent life') that represent the major stages in the macroscopic fossil record.These eras are separated by catastrophic extinction boundaries, the P-T boundary.

1 Re: Relative dating methods in geology

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2 Re: Relative dating methods in geology

Carbon-14, Radiometric Dating - CSI Carbon dating is used to determine the age of biological artifacts up to 50,000 years old. This technique is widely used on recent artifacts, but educators and students alike should note that this technique will not work on older fossils (like those of the dinosaurs alleged to be millions of years old).