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Geologic Time-Lytle

Lytle APES Geologic time

QuestionAnswer
Eon Two or more geological eras combined. It is the largest division of geologic time, lasting many hundreds of millions, or even billions of years.
Era a major division of geological time; it is usually divided into two or more periods.
Period The basic unit of geological time in which a single type of rock system is formed, lasting tens of millions of years.
Epoch A particular period of geologic time marked by distinctive features, events, etc... such as an ice age.
Precambrian Era From 4600 to 540 mya.
Precambrian Era During this era, the Earth formed, seas formed, mountains began to grow, oxygen built up in the atmosphere, and life began in the oceans.
Paleozoic Era From 540 to 250 mya.
Paleozoic Era
Created by: jdlytle
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