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beginning
We are at the beginning of the third millennium of the common era (or AD, to those who prefer it).
The 21st century is the current century of the Anno Domini era or the Common Era, in accordance with the Gregorian calendar. It began on January 1, 2001, and will end on December 31, 2100. It is the 1st century of the 3rd millennium.
The permian period was the end of the paleozoic era.
The permian period was the end of the paleozoic era.
End of an Era was created on 2006-06-01.
There were major asteroid impacts.
The launching of the Britannia in 1840 marled the dawn of a new era. Made of wood and equipped with auxiliary sails. I think it is a boat.
The Classical era
There were major asteroid impacts.
Rutherford Hayes oversaw the end of the Reconstruction Era.
There were major asteroid impacts.