A major division of geological time.
The noun GEOLOGICAL ERA has 1 sense: 1. a major division of geological time; an era is usually divided into two or more periods. Familiarity information: GEOLOGICAL ERA used as a noun is very rare. Age of Reptiles; Mesozoic; Mesozoic era (from 230 million to 63 million years ago). Paleozoic; Paleozoic era (from 544 million to about 230 million years ago). Holonyms (geological era is a part of...): aeon; eon (the longest division of geological time). Era, Geological. an interval of time in the earth’s geological history, during which an erathem formed. Eras are subdivided into periods; several eras combine to form an eon. There are three eras in the most recent Phanerozoic eon: the Paleozoic, Mesozoic, and Cenozoic eras. (See also.  The geological time scale (GTS) is a system of chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships between events that have occurred throughout Earth’s history. As with the time scales above, this time scale is based on the International Commission on Stratigraphy. (See lunar geologic timescale for a discussion of the geologic subdivisions of Earth's moon.) This table is arranged with the most recent geologic periods at the top, and the most ancient at the bottom. Glossary of geologic terms. Glossary of Geologic Terms. This glossary of geologic terms is based on the glossary in Earth: An Introduction to Geologic Change, by S. Judson and S.M. Richardson. (Englewood Cliffs, NJ, Prentice Hall, 1995). Where possible, definitions. Precambrian An informal term to include all geologic. time from the beginning of the Earth to the beginning of the Cambrian. period 570 million years ago. precession of the equinox The wobble of the Earth as. it spins changes the direction in which its axis of rotation points. Hypernyms (geological era is a kind of...): geologic time; geological time (the time of the physical formation and development of the earth (especially prior to human history)). Meronyms (parts of geological era): geological period; period (a unit of geological time during which a system of rocks formed). Age of Reptiles; Mesozoic; Mesozoic era (from 230 million to 63 million years ago). Paleozoic; Paleozoic era (from 544 million to about 230 million years ago). Holonyms (geological era is a part of...): aeon; eon (the longest division of geological time). Definition of GEOLOGICAL AGE. : an age earlier than the postglacial and hence datable only by geology. ADVERTISEMENT. This word doesn't usually appear in our free dictionary, but the definition from our premium Unabridged Dictionary is offered here on a limited basis. This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga (billion years ago). As with the time scales above, this time scale is based on the International Commission on Stratigraphy. (See lunar geologic timescale for a discussion of the geologic subdivisions of Earth's moon.) This table is arranged with the most recent geologic periods at the top, and the most ancient at the bottom. Definition of GEOLOGIC TIME. : the long period of time occupied by the earth's geologic history. geologic time table. See geologic time defined for kids.  WCMS sparkles with 'Water Games' by Tamer, Joyce / Telegram & Gazette (Worcester, MA). The Cenozoic Era is the current and most recent of the three Phanerozoic. , following the Mesozoic Era and covering the period from 66 million years ago to the present.  Other subdivisions reflect the evolution of life; the Archean and Proterozoic are both eons, the Palaeozoic, Mesozoic and Cenozoic are eras of the Phanerozoic eon. The two million year Quaternary period, the time of recognizable humans, is too small to be visible at this scale. As with the time scales above, this time scale is based on the International Commission on Stratigraphy. (See lunar geologic timescale for a discussion of the geologic subdivisions of Earth's moon.) This table is arranged with the most recent geologic periods at the top, and the most ancient at the bottom.
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geological era definition