The Geologic Time Scale – Flashcards
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1) Mesozoic Era 2) Precambrian Time 3) Cenozoic Era 4) Paleozoic Era
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1) b 2) d 3) a 4) c
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What is a Period
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A unit of geologic time that subdivides eras.
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What is Geologic Time Scale
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A record of the geologic events and the evolution of life forms as shown in the fossil records.
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What is an Era
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A long unit of time used to divide the time between Precambrian Time and the present.
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The geologic time scale is a record of the GEOLOGIC EVENTS AND THE EVOLUTION OF LIFE FORMS as shown in the fossil record
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TRUE
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The first step in developing THE GEOLOGIC TIME SCALE was studying rock layers and index fossils worldwide.
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TRUE
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Scientists divided the time between Precambrian time and the present into FOUR units of time, or eras.
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FALSE: Three
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PERIODS are subdivided into units of geologic time called ERAS.
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FALSE: Eras, Periods
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Because the time span of Earth's past is so great, geologists use the __________ time scale to show Earth's history.
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Geologic
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Scientists chose where units of geologic time began and ended based on major changes in ___________ at certain times.
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Life Forms
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The long span of time that begins geologic time is _____________.
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Precambrian Time
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Geologists divided the time between Precambrian Time and the present into three long units of time called __________.
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Eras
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The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in the ___________ Era.
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Mesozoic
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__________ for many of the geologic periods come rom places around the world where geologists first described the rocks and fossils of that period.
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Names
