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The Cretaceous, Jurassic and Triassic Periods are collectively referred to as the “age of reptiles”.
The first flowering plants appeared near the beginning of the Cretaceous Period.
Research publications would give error bars for such division dates – it is not implied here that these boundaries are known to 3 or 4 significant digits.
The division of the geologic column into different periods is largely based upon the varieties of fossils found, taken as indicators of a time period in Earth’s history.
Ions are divided into smaller time periods known as age.