geologic time 1
noundomain: time
Princeton WordNet [ver.3.1]
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EnglishDefinition
the time of the physical formation and development of the earth (especially prior to human history)
Hypernym
time 5
noun
the continuum of experience in which events pass from the past through the present to the future
EnglishHyponym
eon 1
noun
the longest division of geological time
period 4
noun
a unit of geological time during which a system of rocks formed
era 2
noun
a major division of geological time; an era is usually divided into two or more periods
epoch 3
noun
a unit of geological time that is a subdivision of a period and is itself divided into ages
Callovian 1
noun
In the geologic timescale, an age or stage in the Middle Jurassic, lasting between 164.7 ± 4.0 Ma (million years ago) and 161.2 ± 4.0 Ma.
