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Etienne, Bishop of Liège, composed the first Gregorian chants that were used. The date he wrote them is not recorded, but he lived from 850 to 920 AD, and they are believed to have been written in the 10th century, so you have twenty years to play with.
100 Years,. Correction: Asking how long an era is, is the same as asking how long is a piece of string. An era can be any segment of time that can be distinguished. Such as, the 'Nazi era', 'George W. Bush era'. An era is NOT 100 years, that is a century.
The current era of time will be called the Digital Age.
Mammals became the dominant land animals in the early Paleocene period of the Cenozoic era, after the extinction of the non-avian dinosaurs at the end of the Cretaceous period of the Mesozoic era.
Tribal Era (Agricultural Revolution) Frontier Era (Lets conquer the wilderness) Early Conservation Era (lets preserve the wilderness) Environmental Era (60s- science, 70s- regulation, 80s- business)