Geologic Time Scale Test Review Question Preview (ID: 49174)
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The end of the Permian and Cretaceous Periods were marked by
a) many new life-forms
b) the extinction of reptiles
c) mass extinction
d) domination of dinosaurs
The numeric age of an object is called
a) relative age
b) absolute age
c) comparative age
d) relational age
The Pliocene Epoch began about 5.3 MYA, or
a) 5.3 thousand years ago
b) 5.3 billion years ago
c) 5.3 years after Earth formed
d) 5.3 million years ago
Scientists have most accurately determined the absolute ages of rock layers by
a) factoring rates of sediment deposition
b) determining rates of erosion
c) using radiometric dating methods
d) using geologic columns
The fossilized remains of an organism found in very dry places are called
a) petrification
b) carbon films
c) mummification
d) trace fossil
The gradual development of new organism from preexisting organisms is called
a) environmental change
b) mass extinction
c) natural selection
d) evolution
The age of an object in relation to the ages of other objects is
a) comparative age
b) relational age
c) absolute age
d) relative age
Carbon films are
a) carbonized bones of animals or fish
b) carbonized impressions of plants or fish
c) carbonized isotope of organic material
d) carbonized trace fossils
How many half-lifes would be necessary for a sample of parent isotopes to decay to the point that only 1/8 of the sample is composed of parent isotopes?
a) 1
b) 2
c) 3
d) 4
The most common Precambrian fossils are
a) trilobites
b) cyanobacteria
c) brachiopods
d) marine worms
The division of geologic time that makes up 88% of Earth's history is called
a) the Paleozoic Era
b) the Permian Period
c) the Precambrian Time
d) the Cambrian Period
Dinosaurs became extinct at the end of the
a) Cretaceous Period
b) Paleocene Epoch
c) Jurassic Period
d) Triassic period
The Precambrian rock record is difficult to interpret because
a) tectonic activity has altered the original order of rock layers
b) Precambrian rock contains many fossils
c) Precambrian rock contains many minerals
d) very few rocks exist from the Precambrian time
Organisms that formed index fossils
a) lived during long spans of geologic time
b) were destroyed by igneous rock
c) were destroyed by sedimentary rock
d) lived during short spans of geologic time
Almost all fossils are discovered in
a) volcanic rock
b) sedimentary rock
c) metamorphic rock
d) igneous rock
Younger layers of undisturbed sedimentary rock are above older layers according to
a) the angular unconformity
b) the principle of sedimentarianism
c) the law of superposition
d) the principle of uniformitarianism
A table that outlines the development of Earth
a) geologic time scale
b) period
c) eon
d) geologic column
The first period of the Mesozoic Era is called the
a) Cretaceous Period
b) Triassic Period
c) Jurassic Period
d) Quaternary Period
The unit of geologic time into which a period is divided
a) period
b) era
c) eon
d) epoch
Fossilized dung or waste is called
a) gastrolite
b) coprolite
c) index fossil
d) waste
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