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The shortest era in geological time is the Cenozoic Era, the current era. It started 65.5 million years ago with the K-T extinction event.

List from longest to shortest.

Paleoproterzoic (2,500 - 1,600 ma) - 900 million years

Mesoproterzoic (1,600 - 1,000 ma) - 600 million years

Neoproterzoic (1,000 - 542 ma) - 458 million years

Paleoarchean (3,600 - 3,200 ma) - 400 million years

Meseoarchean (3,200 - 2,800 ma) - 400 million years

Neoarcheasn (2,800 - 2,500 ma) - 300 million years

Paleozoic (542 - 251 ma) - 291 million years

Eoarchean (3,800 - 3,600 ma) - 200 million years

Mesozoic (251 - 65.5 ma) 185 million years

Cenozoic (65.5 ma - Now) 65.5 million years

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