The beginning of Earth's current era is marked by a mass extinction.
the mass extiction
65 million years
The current era today is Cenozoic
9500 BC.
If by "Common Era" you are referring to the era name system, then Christianity coincided with the beginning of the Common Era. In fact, the Common Era is also known as the "Christian Era" or "Current Era". The year 1 CE is the year in which a 6th century monk estimated that Jesus had been born when he created the Common Era calendar.
The current era is the Cenozoic Era.
precambrian era
the mesoproterozoic was an era itself not a period.
Classical era
in the era of awesomeness when dinosaurs were alive.
The current era is Cenozoic era. The preceding era was Mesozoic era. However if you are looking for periods in Cenozoic era, the current one is Neogene period, the preceding period was paleogene period.
The swing era in jazz started in the year of 1935