GEOLOGIC TIME Question Preview (ID: 56307)


Geologic Time Units, How Time Is Divided, Index Fossils. TEACHERS: click here for quick copy question ID numbers.

The Geologic Time Scale has been subdivided into a number of time units called periods on the basis of
a) fossil evidence
b) rock thicknesses
c) rock types
d) radioactive dating

Why are ancient volcanic ash deposits important to geologists?
a) They are easily dated using carbon-14.
b) They form resistant rock layers containing fossils.
c) They indicate areas where major earthquakes occurred.
d) They serve as good geologic time markers.

Approximately what percent of geologic time since the estimated origin of the Earth is represented by the Precambrian Era?
a) 37%
b) 87%
c) 50%
d) 12%

Which sequence shows the correct order of Earth's geologic time intervals from oldest to youngest?
a) Archean, Mesozoic, Cenozoic, Paleozoic, Proterozoic
b) Archean, Proterozoic, Paleozoic, Mesozoic, Cenozoic
c) Cenozoic, Mesozoic, Paleozoic, Proterozoic, Archean
d) Cenozoic, Paleozoic, Archean, Mesozoic, Proterozoic

Which choice lists the units of geologic time in order from largest time unit to smallest?
a) Epoch, Period, Era, Eon
b) Era, Period, Eon, Epoch
c) Eon, Era, Period, Epoch
d) Period, Era, Eon, Epoch

Index fossils are important to studying geologic time because
a) The are the only fossils from a certain geologic time.
b) They existed for a long time.
c) They are only found in specific locations.
d) They mark a specific moment in geologic history.

A good index fossil must be...
a) Found only in one region over a long period of time
b) Found everywhere in a short amount of time.
c) Found only in sedimentary rock layers
d) Rarely found within only one rock layer.

Which epoch is associated with the Last Ice Age to occur in NYS?
a) Pleistocene
b) Holocene
c) Pliocene
d) Eocene

Geologists estimate the time of Earth's origin and the entire solar system to be
a) 1.6 million year ago
b) 65 million years ago
c) 4.6 billion years ago
d) 13.7 billion years ago

What event usually marks the end of one era and the beginning of another?
a) an asteroid strike
b) a volcanic eruption
c) a mass extinction
d) mountain range formation

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