An era is not a measure of time but is instead identified by events, factors, occurrences. In the "era of the dinosaurs", refers to whatever X length of time that the dinosaurs roamed the land. "In the Renaissance era", will refer to any Y length of time that is viewed as the days of the "renaissance".
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An era is not a measure of time but is instead identified by events, factors, occurrences.
In the "era of the dinosaurs", refers to whatever X length of time that the dinosaurs roamed the land.
"In the Renaissance era", will refer to any Y length of time that is viewed as the days of the "renaissance".