GEOLOGY
PALEONTOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Period
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Era
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Varve
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Half- life
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Detailed explanation-1: -era = A unit of time shorter than an eon but longer than a period. period = A unit of time shorter than an era but longer than epoch. epoch = A unit of time shorter than a period but longer than an age. Archean = “Ancient” eon from 4, 500 Mya – 2, 500 Ma.
Detailed explanation-2: -Epoch: This is the smallest unit of geologic time. An Epoch lasts several million years.
Detailed explanation-3: -The geologic time scale is divided into (from longest to shortest): eons, eras, periods, epochs and ages.
Detailed explanation-4: -One of the key concepts of the Geologic Time Scale is the division of time into units of varying lengths. The largest unit is the eon, which is further divided into smaller units such as eras, periods, and epochs.
Detailed explanation-5: -eon, Long span of geologic time. In formal usage, eons are the longest portions of geologic time (eras are the second-longest). Three eons are recognized: the Phanerozoic Eon (dating from the present back to the beginning of the Cambrian Period), the Proterozoic Eon, and the Archean Eon.