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Exam 24: Geologic Time

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Question 51

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Eons are divided first into

A) eras.
B) periods.
C) millennia.
D) epochs.

E) All of the above
F) B) and C)

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Question 52

Multiple Choice

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Any indication of prehistoric life preserved in rock is called

A) a shale.
B) a radionuclide.
C) a fossil.
D) none of these.

E) A) and B)
F) All of the above

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Question 53

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The earliest (oldest)period in the Paleozoic era is the ______________.

The periods of the Cenozoic era are divided into time units called ______________.

The Holocene is a(n)

A fossil imprint made by the movement of an animal is called a(n)______________ fossil.

The concept of uniformitarianism was developed by ______________,the "father of geology."

Eras are divided first into smaller time units called ______________.

The largest units of geologic time are called ______________.

Sea lilies are more scientifically called ______________.

The Pliocene is a(n)

The Tertiary is a(n)

An important radiometric dating process is the decay of potassium-40 to ______________-40.

Starting with a sample of pure parent radionuclide,what would be the ratio of the parent radionuclide to its daughter after two half-lives have elapsed?

Fossilized tree resin is known as

Much of our energy comes from coal that was formed from plants that lived during the ______________ period.

The Petrified National Forest is found in the state of ______________.

Breaks,or gaps,in the rock record at a given locality are called

In Europe,the combined Mississippian and Pennsylvanian periods are known as the

Which of the following radionuclides has the shortest half-life?