Exam 24: Geologic Time

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

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

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

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

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

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

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

Eras are divided first into smaller time units called ______________.

Fossilized tree resin is known as

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?

The largest units of geologic time are called ______________.

Eons are divided first into

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

The Holocene is a(n)

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

Any indication of prehistoric life preserved in rock is called

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

The Pliocene is a(n)

The Tertiary is a(n)

Sea lilies are more scientifically called ______________.