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Date : 2007-01-18
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Geologic time scale Wikipedia ~ The geologic time scale is a system of chronological dating that relates geological strata to time It is used by geologists paleontologists and other Earth scientists to describe the timing and relationships of events that have occurred during Earths history The table of geologic time spans presented here agree with the nomenclature dates and standard color codes set forth by the International Commission on Stratigraphy
Geologic Time Scale Geological Time Line ~ Dividing Earth History into Time Intervals Geologists have divided Earths history into a series of time intervals These time intervals are not equal in length like the hours in a day Instead the time intervals are variable in length This is because geologic time is divided using significant events in the history of the Earth
GSA Geologic Time Scale Geological Society of America ~ © 2020 The Geological Society of America Inc
Geologic Time Scale GTS Eons Eras Periods Epochs ~ Dividing Earth History into Time Intervals Geologists have divided the history of the Earth into a series of time intervals These time intervals are not equal to the length of the hour in a day Instead the length of time intervals is variable The reason for this is that the geological time is divided by important events in World history
Table of Geological Periods ~ Table of Geological Periods It is generally assumed that planets are formed by the accretion of gas and dust in a cosmic cloud but there is no way of estimating the length of this process Our Earth acquired its present size more or less between 4 billion and 5 billion years ago
Geologic Time Scale A List of Eons Eras and Periods ~ Geologic time spans are divided into units and subunits the largest of which are eons Eons are divided into eras which are further divided into periods epochs and ages Geologic dating is extremely imprecise
Geologic Time Scale Major Divisions of Geologic Time Chart ~ A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years Harland and others 1982 Over the years the development of new dating methods and the refinement of previous methods have stimulated revisions to geologic time scales
Geologic time scale ~ Geologic time scale Take a journey back through the history of the Earth — jump to a specific time period using the time scale below and examine ancient life climates and geography You might wish to start in the Cenozoic Era 655 million years ago to the present and work back through time or start with Hadean time 46 to 4 billion years ago and journey forward to the present day — its your choice
GSA GEOLOGIC TIME SCALE v 5 Geological Society of America ~ gsa geologic time scale v 50 cenozoic age epoch age picks magnetic polarity period hist chro n quaternary pleistocene miocene oligocene eocene paleocene pliocene piacenzian zanclean messinian tortonian serravallian langhian burdigalian aquitanian chattian rupelian priabonian bartonian lutetian ypresian danian thanetian selandian calabrian
ICS ChartTime Scale ~ Global chronostratigraphical correlation table for the last 27 million years Click here to download the pdf file and here to download the explanation of the correlation table Ordovician Chronostratigraphic Chart showing correlation of regional chronostratigraphic schemes with the new global stages and series for the Ordovician System
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