An interval of geologic time shorter than an eon. An era includes two or more periods. There are four major eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic.
A subdivision of geologic time that is longer than a period but shorter than an eon. Precambrian, Paleozoic, Mesozoic, and Cenozoic are the eras of the time scale from oldest to youngest.
A division of geologic time; a subdivision of an eon. Example: Mesozoic Era. View timeline of geologic events.
Geologic time unit that is shorter than an eon but longer than a period.
subdivision of a geological eon of time
a system of chronological notation reckoned from a given date.
A division of geologic time including several periods, but smaller than an eon. Commonly recognized eras are Precambrian, Paleozoic, Mesozoic, and Cenozoic.
major subdivision of the geologic time scale (e.g., Paleozoic, Mesozoic, Cenozoic)
An interval of geologic time representing the largest subdivision of the Phanerozoic Eon.
A unit of geologic time that is next in magnitude beneath an eon; consists of two or more periods. (Example: Paleozoic Era).
A large period of geological time that includes eleven separate periods.
a period marked by distinctive character or reckoned from a fixed point or event
a major division of geological time; an era is usually divided into two or more periods
a subdivision of eon in geologic time
A fixed point in time marked by a memorable or important event or date from which a series of years is reckoned.
A large division of geologic time that is usually shorter than an eon; for example, the Paleozoic era.
a period of time considered to possess a certain distinctive character; there are four distinct eras of geological time, the Palaeozoic, Mesozoic, Tertiary and Pleistocene, each of which are divided into a number of epochs; from Latin aera 'counters'.
A period of time that began on a specific date or is characterized by someone or something.
The longest division of geologic time, measured in millions of years.
One of the four geological time periods that covers the earth’s history, from 570 billion years ago to the present.
A very long period of time which is somehow different from other periods of time.
An interval of geologic time longer than a Period and shorter than an Eon. Geologic time can be summarized, in chronological order, as the Precambrian, Paleozoic, Mesozoic, and Cenozoic Eras.
The second-longest phase of geologic time, after an eon. The current eon, the Phanerozoic, has had three eras, the Paleozoic, Mesozoic, and Cenozoic, which is the current era. The next-smallest subdivision of geologic time is the period.
a large division of geological time consisting of two or more geological periods.
A division of geologic time smaller than an eon and longer than a period.
A unit of geological time, next in order of magnitude below an Eon
A period of time characterized by particular circumstances, events, or personages
Two or more geological periods comprise an Era, which is hundreds of millions of years in duration.
A large division of geologic time. The Precambrian, Paleozoic, Mesozoic, and Cenozoic are eras. An era includes several periods.
one of the major divisions of geologic time. An era is usually divided into periods. [AHDOS
A geologic era is a subdivision of geologic time that divides an Eon into smaller buckets. The Phanerozoic Eon is divided into three such timeframes: the Paleozoic, Mesozoic, and Cenozoic represent the major stages in the macroscopic fossil record. These eras are separated by catastrophic extinction boundaries, the P-T boundary between the Paleozoic and the Mesozoic and the K-T boundary between the Mesozoic and the Cenozoic.