Its usually something big, like an invention that changed the world. For example, the Neolithic age started when people invented farming and domestication. That invention changed the world, and still impacts our every day lives.
End of the Mesozoic era
era,epoch, and period are periods of time that happen in the past
what do the largest clumps surrounding the protosun to begin to form
Because in that era they had a TIME MACHINE that they took and went back to the first era where the cavemen were fascinated by the machine that they killed them and stole it and went back to the third era and they took hostages back with them so yeah they did make it
End of the Mesozoic era
9500 BC.
the mesoproterozoic was an era itself not a period.
in the era of awesomeness when dinosaurs were alive.
Classical era
The swing era in jazz started in the year of 1935
In China the era of dynasties started in 2100 BC
The NHL's modern era began in 1992.
The relationship era began in the 1990s and continues today
The second era of marketing, ushered in during 1950s, is known as the sales era
1824
1811
Mesolithic