Since many of the smallest subdivisions of the geologic timescale were in the past defined on regional lithostratigraphic units, there are many alternative names that overlap. The chart shows major chronostratigraphic and geochronologic units. The geologic time scale is the “calendar” for events in earth history
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It subdivides all time into named units of abstract time called—in descending order of duration— eons, eras, periods, epochs, and ages.
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. Each eon, era, period, and epoch is defined by major geological or paleontological events The eons are the hadean, archean, proterozoic, and phanerozoic The phanerozoic eon is the eon of visible life, and is divided into three eras
The paleozoic, mesozoic, and cenozoic. The names of the individual periods are links Each one leads to a more detailed chart showing the epochs and ages for that period The charts for the individual periods are all drawn to the same scale.
These divisions help scientists describe and interpret earth’s past, including the evolution of life, climatic changes, and tectonic events.
Geologic names lexicon (geolex), a national compilation of names and descriptions of geologic units. The answer is the geologic time scale, a system that divides earth’s history into eons, eras, periods, and epochs It’s the timeline that connects rocks to time — and time to life. Divisions of geologic time approved by the u.s
Geological survey geologic names committee, 2010
