An era is not a defined number of years. Rather, it is a period of time marked by certain characteristics, such as historical events. In geology, an era is composed of periods.
The current era on the geologic time scale is the Cenozoic Era. The era began after the K-T extinction resulted in the end of the Mesozoic Era around 65 million years ago.
The four eras in the history of marketing are known as the production era, sales era, marketing era and marketing control, or relationship, era. Some analyses only include the first three of these.
Generally, the eras used to describe the modern Earth are the Quaternary geological era and the Cenozoic evolutionary era. In the future, there may also be a historical era that the current time period, the 21st century, will belong to.
The Era of Good Feelings was the time between 1817 to 1825 when the United States was dominated by one political party and had little concern about intervention by foreign countries. The phrase was first used on July 12, 1817 in the Boston Columbian Centinel after a visit by President James Monroe t
Country music is believed to have officially begun in 1927, when Victor Records signed the Carter Family and Jimmie Rogers. The genre became very popular in the 1940s and 50s, and many aspects of country music have influenced other genres, as well as American culture.
The era occurring before the current geologic era was the Mesozoic, which began roughly 245 million years ago and ended about 64 million years ago. The Mesozoic era consisted of three periods; from oldest to more recent, they are the Triassic, the Jurassic and the Cretaceous periods.
The Precambrian Era is the oldest period of history on Earth. This era comprises about 88 percent of Earth's total geologic existence. It is the period between Earth's formation and the development of primitive multicelled organisms.
Nationalism occurs when people identify with their county or ethnicity, and this idea impacted Romantic era composers who displayed aspects of their national identity in their music. Composers created music that was directly inspired by political events and demonstrated people's fears, hopes and dre
Progressing from the oldest to the current, the four major eras of Earth's geological history are Precambrian, Paleozoic, Mesozoic and Cenozoic. The lengths of these eras are often measured by the term "mya," which represents "millions of years ago." The four major eras of the geological time scale,