Exam 24: Geologic Time

Starting with a sample of pure parent radionuclide, what would be the ratio of the parent radionuclide to its daughter after one half-life has elapsed?

When rocks and geologic events are placed in chronological order without regard to actual dates, ______________ geologic time is obtained.

Geologic evidence places Earth's age at ______________ million years.

A number of epochs is called a(n)

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

The Tertiary is a(n)

The Triassic is a(n)

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

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

Sedimentary layer A lies above sedimentary layer B. Fault C cuts through B but does not affect A. Arrange A, B, and C in order of oldest first to youngest last.

______________ fossils are those typical of a particular limited time segment of Earth's history.

About how long ago was the last retreat of the glaciers from North America and Europe?

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

The study of fossils is called

Which of the following were marine invertebrates that looked like plants and left fossil segments sometimes called "Indian money"?

Rubidium-______________ dating is an important radiometric dating tool.

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

The Permian is a(n)

Archaeopteryx fossils are those of a prehistoric

Sedimentary layer A lies above sedimentary layer B, and both are cut by an igneous dike, C. Therefore, the order from oldest to youngest is