geological time scale

The Geological Time Scale (GTS) Bedashree Choudhury 14109MWS

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A very short (and largely photographic) presentation on the Geological Time-Scale

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The

Geological

Time

Scale (GTS)

Bedashree Choudhury14109MWS

What is it?

a system of chronological measurement that relates stratigraphy to time, to describe the timing and relationships between events that have occurred throughout Earth's history.

Who uses it?

Geologists, paleontologists, archaeologists, anthropologists, and other Earth scientists.

Why do we need to know about it?

History Important events Exploration

Record Calendar Evolution Dating General knowledge Links; Chains

How does one construct a geological time scale?

By studying rock layers [Stratigraphy]

Mining

Bottom-most layer = oldest; topmost layer = newest ← Principle of Uniformitarianism (geology)

Fossils, artifacts, ecofacts, biofacts; evidence in the different layers

Segments of rock (strata) in

chronostratigraphy

Time spans in geochronology

Notes to geochronological

units

Eonothem Eon Half a billion years or more

Erathem Era Several hundred million years

System Period Few hundred million years

Series Epoch Tens of millions of years

Stage Age Millions of years

Units

Age of the Earth : 4.54 ± 0.05 billion years

Comparatively...

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