Definitions for "Geologic time scale"
Related Terms:
Geologic time, Epoch, Holocene, Holocene epoch, Eon, Era, Pleistocene epoch, Pleistocene, Quaternary period, Quaternary, Recent, Precambrian, Ice age, Hadean, Carboniferous period, Archean, Pliocene, Glacial period, Permian period, Glacial epoch, Phanerozoic eon, Permian, Silurian, Cambrian period, Devonian period, Cretaceous period, Proterozoic, Triassic, Cretaceous, Carboniferous, Triassic period, Jurassic period, Cenozoic era, Miocene, Cambrian explosion, Cenozoic, Cambrian, Neogene, Pennsylvanian, Time scale, Devonian, Tertiary, Jurassic, Catastrophism, Ordovician, Phanerozoic, Mississippian, Archaean, Palaeozoic, Paleozoic
a relative time scale based upon fossil content. Geological time is divided into eons, eras, periods, and epochs Artist+s rendition of GOES I/M, geostationary satellites whose mission includes data collection and broadcasting, and environmental sensing. (Image: NASA/Goddard Space Flight Center)
The time scale determined by the geologic column and by radiometric dating of rocks.
A time scale in which the earth and its atmosphere are dated. It is broken into two division; Relative Time: Determines the age relative to other surrounding objects; Absolute Time: Obtained with radiometric dating of the object. [Holmes, A, 1937. The Age of the Earth. (New Edition Revised). Nelson: London, p.1-263.] [Harland, W.B.; Armstrong, R.L.; Cox, A.V.; Craig, L.E.; Smith, A.G.; and Smith, D.G.; 1990: A geologic Time Scale, 1989 Edition. Cambridge University Press. Cambridge, p1-50.
Standard description of time intervals in the history of the earth, based on a combination of relative dating and absolute dating criteria. Geophysics Study of how basic physical principles are used to better understand the earth, particularly its interior.
The division of geologic history into eras, periods, and epochs accomplished through stratigraphy and paleontology.
a diagram that details the history of the Earth's geology, noting major events like the formation of the Earth, the first life forms and mass extinctions
Scale used to measure time relative to events of geological significance.
a chronological arrangement of geologic events, commonly represented in a chart form with the oldest event and time unit at the bottom and the youngest at the top
The division of all of Earth history into blocks of time distinguished by geologic and evolutionary events, ordered sequentially and arranged into eons made up of eras, which are in turn made up of periods, which are in turn made up of epochs.
Geologic time or "deep time" has been subdivided into a number of units, such as Eons, Eras and Periods. The Geologic Time Scale.
Relative time scale based on stratigraphic position and correlation, and many different types of chronologic evidence. Geologic time is broken down into eons, eras, periods and epochs.
A categorization of geological events based on successively smaller time spans: eons, eras, periods and epochs.
n: Occurring at such a slow pace, or at such infrequent intervals, as to be imperceptible to humans. 2. Occurring in a pre-human era. 3. The whole of earth's history, as opposed to the very recent period when humans have walked the earth. One common and effective means of conceptualizing the disparity between the geologic time scale and the human time scale is the "calendar year history model," wherein the entire history of the planet is condensed into a single calendar year. In this model, human ancestors do not appear until late December and Homo sapiens does not arise until the last second before midnight on December 31st.
Subject: Geology The division of Earth history into blocks of time-€Ons, eras, periods, and epochs. The time scale was created using relative dating principles. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International. [ Pics List
The geological time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth. The table of geologic periods presented here is in accordance with the dates and nomenclature proposed by the International Commission on Stratigraphy, and uses the standard color codes of the United States Geological Survey.