Geologic Time Periods in Order flashcards

How this deck was checked

On 2026-10-21, every card was compared with a primary source and with a second source from a different publisher. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.

Sources

• Primary source Divisions of Geologic Time—Major Chronostratigraphic and Geochronologic Units (Fact Sheet 2026-3023) (U.S. Geological Survey, pubs.usgs.gov)
• Primary source Geologic Time Scale (National Park Service, Geologic Resources Division, nps.gov)
• Second source Geologic time scale (Wikipedia, en.wikipedia.org)
• Second source Paleozoic (Wikipedia, en.wikipedia.org)
• Second source Mesozoic (Wikipedia, en.wikipedia.org)

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