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 two half-lives have elapsed?

The term age of reptiles is sometimes used to refer to the ______________ era.

Which epoch is also called the Ice Ages?

The hollow depression left when a shell or bone is dissolved completely out of a rock is called a(n)

Any indication of prehistoric life preserved in rock is called

The span of time required for the radioactive decay of half the parent nuclei in a sample is known as the ______________.

The organisms called ______________ were the first organisms with eyes and were wiped out at the end of the Paleozoic era.

Periods are divided into

The oldest algal fossils are found on the continent of ______________.

The Cenozoic era consists of the Tertiary and ______________ periods.

The actual age of rock layers and geologic events is referred to as ______________ geologic time.

The Jurassic is a(n)

Lack of knowledge of the phenomenon called ______________ led Lord Kelvin to an incorrect estimate of the age of Earth.

Layers of sediment, lava, and ash are originally laid down in a(n) ______________ position.

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

The Paleozoic era ended and the Mesozoic era began about ______________ million years ago.

The Shroud of Turin, the Iceman, and the Dead Sea Scrolls were dated by use of

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

The Cambrian is a(n)

The process of matching up rock layers in different localities by the use of index fossils or other means is called ______________.