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www.reference.com/science/long-era-78537c97ed440e58

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.

www.reference.com/science/era-3f33f01cc53ce5be

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.

www.reference.com/science/era-live-today-f2d95939259858ed

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.

www.reference.com/article/era-good-feelings-576bd0223056ccbc

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

www.reference.com/article/era-occurred-just-before-current-era-e58db5dd343773a0

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.

www.reference.com/business-finance/four-eras-history-marketing-b31e4c107579e0b1

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.

www.reference.com/article/nationalism-did-affect-way-music-composed-romantic-era-9daba31b972b5e85

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

www.reference.com/article/oldest-era-ee43e339c6c7947d

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.

www.reference.com/article/steroid-era-2165ea5fa2badc55

The "steroid era" is a colloquial term applied to a period of time in the late 20th and early 21st centuries when performance-enhancing drug (PED) use was widespread in American professional baseball. While only a few players actually admitted or can be proved to have used PEDs during this time, acc

www.reference.com/article/occurred-during-banking-era-4315d12f0bacc6ae

During the free banking era in 1837 to 1862, there was no federal bank, and America's states, territories and private institutions freely printed and circulated their own currencies. In this era of uncontrolled "wildcat" banking, many banks closed, and the bills that some banks and businesses issued